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the antithesis of couplets requires not only the same number of words, but also syntactic similarity. Syntactic similarity mainly includes three contents: equivalent sentence structure, same part of speech and corresponding structure
the sentence pattern is equivalent, which means that if the upper couplet is a four or three sentence pattern, the lower couplet must also be a four or three sentence pattern; If the first couplet is a two or four sentence pattern; Then the next couplet must also be two or four sentence patterns. Such as:
"horizontal eyebrow cold to thousand husband finger; Bow down and be willing to be an ox
is a four or three sentence pattern, that is,
"cold confrontation with horizontal eyebrows - thousand fingers; Bow down and be willing to be an ox
"only state officials are allowed to set fire; People are not allowed to light lamps. "
is a two four sentence pattern, that is,
"only state officials are allowed to set fire; People are not allowed to light lamps. "< Another example is the couplet of Du yuan's chishishan scenery in Xinhui County, Guangdong Province; Wind breaks rock smoke
is a two or three sentence pattern, that is,
"Yuexuan - chuanshishui; The wind breaks off the smoke of the rock. " Second,
"the sound of birds and the sound of streams, free from the sound of Sheng Huang, does not fake human silk and bamboo; Mountain Cloud cage tree color, natural picture, he Lao pen Danqing
is the sentence pattern of 23, 22 and 24, that is,
"birdsong - Hexi sound, free - Shenghuang, true - human silk and bamboo; Mountain Cloud -- cage tree color, nature -- picture, what's the trouble -- the color of the pen. "
the equivalence of parts of speech refers to the equivalence of parts of speech in the corresponding positions of the upper and lower couplets, that is, noun to noun, verb to verb, adjective to adjective, quantifier to quantifier, adverb to adverb, modal particle to modal particle, and reiterative to reiterative. For example, Beijing Bibo Temple couplet:
"Yiting fangcaowei new green; Ten mu of rattan flowers are fragrant. "
"Yiting" is a quantifier for "Shimu", "Fangcao" is a formal noun for "Tenghua", "Wei" is a verb for "Luo", and "Xinlv" is a formal noun for "Guxiang"
another example is the Baotu Spring couplet in Jinan:
"in the mirror of the painted Pavilion, you can see the fairy land; Outside the clouds of the Feiquan spring, it is dictated as a clear sound of mountains and rivers. "<
"Huage" is a partial formal noun for "Feiquan", "mirror" for "cloud", "middle" for "outside" for location, "look" for "listen" for action, "fantasy" for "write" for verb, "immortal" for "landscape" for noun, "Fudi" for "Qingyin" for partial formal noun<
another example is a spring festival couplet made by a farmer in Yunnan when he was angry with the landlords and gentry in the late Qing Dynasty:
"eh, where to shoot? Oh, they celebrate the new year. "
"Yi" is an onomatopoeia to "Oh", "where" is a pronoun to "they", and "fangpao" is a verb to "guonian"
corresponding structure means that the relationship between the words forming the couplet should be the same. For example, the upper couplet is subject predicate structure, and the lower couplet should be subject predicate structure; The first couplet is a verb object structure, and the second couplet is a verb object structure. For example, the couplet of Xin Qiji Memorial Temple:
"pull the river and mountain with great strength, the spirit runs through the sun and the moon, and there is a hero's heart in spare time<
the name of the universe, the sunset rush cattle fight, there are thousands of tragic words left
among them, "Li Wan He Shan" and "Ming Chui universe" are subject predicate structures, and the predicate part is verb object structure“ "Haoqiguanriyue" and "xiguangchongniudou" are also subject predicate structures, and the predicate part is also verb object structure“ In spare time, there is a hero's heart "and" there are thousands of tragic words left. " It is a verb object structure, and the object part is a supplementary structure< Another example is the South Gate couplet of Mount Tai in Shandong Province: "the gate opens nine nights, and you can walk for three days."; It is a grand place with hundreds of steps, overlooking the wonders of a thousand peaks. "
"menbijiuxiao" and "jiechongji" are both subject predicate structures, and the predicate part is verb object structure. "Yangbu three-day miracle" and "overlooking Qianzhang wonders" are both verb object structures, and the object part is partial structure, and the structure is exactly the same< Thirdly, it stresses the level and tone of couplets, which is basically consistent with the requirements of the neck couplets in the old style poetry. The purpose of emphasizing the level and tone is to make the antithetical couplet read with cadence and harmony. The level of couplet requires level to level and level to level. It can also be "one, three, five no matter" (that is, the first, third, fifth words in the singular position can be relaxed), but it should be "two, four, six clear" (that is, the second, fourth, sixth words in the even position must be strictly in accordance with the requirements of the tone). The so-called "Ping" refers to Ping tone in ancient times, and "Ze" refers to Shang tone, Qu tone and Ru tone. The modern level tone refers to the pronunciation of Putonghua. The first and second tones (Yinping and Yangping) are the level tones, and the third and fourth tones (shangsheng and Qusheng) are the level tones. For example, Mr. Lu Xun wrote:
"with a cold cross eyebrow, pointing to a thousand men; Bow down and be willing to be an ox<
the horizontal tone of this couplet is "horizontal tone, horizontal tone, horizontal tone, horizontal tone"
another example is the couplet of Sansu temple in Meishan, Sichuan, written by Xiang Chu:
"famous father and son in Northern Song Dynasty, ancient ancestral hall in Nanzhou."<
the level of this couplet is "level level level level level level level, level level level level level level"
another example is a couplet hanging from Huangguoshu waterfall Pavilion in Guizhou Province:
"white water is like cotton, and it doesn't need a bow to bounce; The rosy clouds are as beautiful as brocade, so it's not necessary to weave the sky. "
the level of this couplet is "level, level, level, level, level"; The word "Ke" in the lower part of the couplet means that it does not conform to the law of the corresponding level. However, according to the principle of "one, three and five", the word "Ke" is allowed to be in the position of one, three and five
couplets pay attention to flat tone, sound sonorous, rhythmic and full of musical beauty
if we want to pay attention to the level and tone, we must not use the same words where the parts of speech of the upper and lower couplets are the same. Because if the same word is used, it will inevitably break the rules of the level and tone. For example, there is a couplet of an old social Theater: "sing less snow and moon, so as not to be distracted."<
show more loyalty, filial piety, benevolence and righteousness to save the hearts of the world. "
the meaning of "dian" in "sing Dian" is the same as that of "Yan Duo", but it can't be the same word, just like a word, it can't be matched
however, according to the principle that words do not harm the meaning, in order to express the need, the same word is also allowed to appear under special circumstances and will be accepted. Of course, this affects the level and tone, but it already belongs to the category of width vs. Kuan is not very strict with the requirements of tone and antithesis. For example, when Zhang Jin, the right Minister of the Ministry of household, was the magistrate of Nan'an in the Ming Dynasty, he wrote a couplet for Qiao Lou in Haining County, advocating a clean and honest government:
"if one cent is lenient, the people will receive one more cent
if you take an article, the official is not worth an article. "
among them, there are the same characters in the positions of two, four and eight characters. However, e to the profound meaning of the couplet, people don't care about its irregular tone< Another example is Zhou Enlai's help to CAI yuanpeilian: "from paiman to the war of resistance against Japan, Mr. Zhou's ambition is the national revolution
from the May 4th movement to the League for human rights, Mr. Wang's trip was in democracy and freedom. "
the same words appear in the first, fourth, ninth, tenth, eleventh, thirteenth and fourteenth parts of the couplet. However, this couplet highly summarizes Cai Yuanpei's great contribution in his life, and its content is refined, so people will not care whether its level and tone are in line with the rules< In terms of content, each couplet can express a complete meaning. There are some special exceptions, such as the ruthless opposition in Ming and Qing Dynasties. If the meaning of the couplets is the same, similar, complementary and deepened, it is called the right couplet; If the meaning of the upper and lower couplets is opposite and relative, and the contents set off and contrast with each other, it is called opposition<
such as Dong Biwu's couplet of Nanhu Revolutionary Memorial Hall:
"misty rain tower, revolution started, there was a star fire here
in the world of wind and cloud, when spring comes, Yin Lei is heard everywhere. "
this is right. The upper and lower couplets complement and deepen each other, showing the great influence of Nanhu in the history of Chinese revolution and its great contribution to the revolution< Another example is Li Dazhao's couplet:
"struggle for revolution, sacrifice for revolution, die without regret
living under oppression, groaning under oppression, how can the living be embarrassed? "< This is opposition, comparing Li Dazhao's "struggle" and "sacrifice" for revolution with other people's "life" and "groan" under oppression, praising Li Dazhao's fearless revolutionary spirit
from the perspective of the relationship between the upper and lower couplets, the upper and lower couplets of most couplets are parallel, which is usually called "flat couplet". For example, He Xiangning and Liao Zhongkai said: "the kindness of husband and wife is not complete in this life, but in the next life; Two children are in debt, and one is in debt. "
this couplet is about Liao Zhongkai's farewell to his wife and children after he was killed by the reactionaries. The first couplet is written from the wife's point of view, and the second couplet is written from the children's point of view
but there are also upper and lower couplets that are successive, which is called "string pair". For example, there is a couplet in Du Fu's poem "Wen Guan Jun Shou He Nan and He Bei":
"that is, from Ba gorge to Wu Gorge; He went down to Xiangyang to Luoyang. "
the upper and lower couplets of this couplet are in accordance with each other, that is, the lower couplet is the continuation of the upper couplet. Of course, the consequent relationship also includes the relationship between condition and result, sequential connection, turning connection and so on
however, in couplets, there can be no "hand in hand", that is, the meaning of the two couplets is repeated. Such as:
"xuanni was sad to get Lin; "Xishou, I konqiu."
here, "xuanni" and "Confucius" are the same person“ Sad "and" tears "are synonymous," Huolin "and" Xishou "refer to the same thing
Bian xiutan 01280208
Old actors are old actors, and their acting skills are far inferior to those of today's little fresh meat. For example, we are familiar with the old play Gu Du yuan. He has played many plays, each of which can be called a classic. Deep portrayal of the characters, this kind of acting skills, but also the inner soul of the characters to completely show in front of our eyes
the last time I saw his play was last year. It was a TV play called naughty yesun. In this play, he plays a grandfather, which is the same as our thousands of grandfathers, but different from them. An elderly grandfather who has been unwilling to serve the old, a grandfather who is dedicated to his children. This TV play is still funny, and the biggest attraction is what happened between the two
when I watch this TV play, I can feel the strong warmth from it. That majestic grandfather, who has been a soldier, has seen all kinds of big waves, has been a village head, and has been in charge of many people. Hard and soft do not eat is also particularly stubborn, but what he is most afraid of is his little grandson, like all the grandfathers, the next generation is the closest, and he loves his grandson very much
1、 Regional metallogenic geological background
the metallogenic series of the deposit straddles Nandan, Hechi, Yishan and other cities and counties, and is generally distributed in NW direction (Fig. 4-8). Its geotectonic position is located in the composite part of the Paleo Tethys tectonic domain and the Pacific tectonic domain, and is located in the South China microplate
mineralization and prospecting evaluation of hydrothermal sedimentary deposits in Guangxi
Fig. 4-8 geological sketch of Late Paleozoic hydrothermal sedimentary mineral resources in northern Guangxi (Danchi) area | 1-triassic; 2-permian; 3-carboniferous; 4 - Devonian system; 5 - measured and inferred faults; 6 - geological boundary; 7-late Yanshanian granite; 8-late Yanshanian granite porphyry; 9-late Yanshanian quartz porphyry; 10 - late Yanshanian diorite porphyrite; 11 - tin ore; 12 - lead zinc deposit; 13 - tin polymetallic ore; 14 - chalrite; 15 - mercury ore; 16 - antimony ore; 17 - antimony tungsten ore; 18 - antimony polymetallic ore; The southwest margin of 19-mn deposit (grade I) belongs to Youjiang Hercynian Indosinian rift sea (grade III) of South China continental margin structural area (grade II), and its fourth grade structural unit is Guixi fault depression. In the early Paleozoic, this area was a part of the South China continental margin. The Guangxi movement at the end of Silurian brought the Yangtze plate and Cathaysian plate together to form a unified South China plate At the beginning of Early Devonian, e to the influence of regional expansion and mantle thermal movement, the NW trending Nandan Kunlunguan fault was formed, and the Danchi half graben basin was formed. From Lianhuashan Yilan period of Early Devonian, the sea water entered the area from the southwest, and developed tidal flat facies belt, subtidal belt semi limited basin facies belt; From the late Early Devonian to the early Middle Devonian, with the expansion of the paleo Tethyan ocean along the Jinshajiang Honghe fault zone, the area entered the first intense extension period of Devonian, the transgression expanded and pushed forward from south to north, the sedimentary environment changed significantly, and nandantai gully related to the NW synsedimentary fault appeared, There are black carbonaceous mudstone intercalated with thin siliceous rock and limestone in the platform and gully. The environment on both sides of the platform and gully is mainly open platform environment, or subtidal semi limited basin and semi limited platform environment; In the late Middle Devonian, e to the continuous activity of some synsedimentary faults, some areas of the area declined and the transgression expanded, which was the beginning of the largest transgression since Devonian. Due to the intensification of the East-West Yishan fault activity and the combination with the north-west Danchi fault, a branched nandantai gully was formed (Wu Yi et al., 1987); In the early stage of Late Devonian, the Devonian crust of Guangxi underwent another intense extension period, which was also the largest transgression period since Devonian. The sedimentary environment in the area was mainly platform trench, followed by open platform or platform front slope on both sides of platform trench. In the platform trench, the siliceous rock mudstone limestone assemblage (Luofu formation) and siliceous rock siliceous mudstone assemblage (Liujiang formation) were deposited, There are also intermittent volcanic eruptions and related submarine hot spring activities, which play an important role in the mineralization of tin polymetallic deposits in the area; In the late Devonian, the regression occurred again. Although the sedimentary environment was still dominated by the platform trench, the sediments in the platform trench were mainly banded and lenticular limestone; In the Early Carboniferous, the Danchi fault zone was further tensioned and subsided, resulting in the formation of Yilan synsedimentary fault in the transition zone between the platform trench facies and Leye Bama platform in the South and west of the basin, and the Danchi basin evolved from a half graben type to a graben type basin (Chen Hongde et al., 1989b), However, this area still maintains the pattern of alternating channel and platform, in which there are still micritic carbonate rock, argillaceous rock and siliceous rock assemblages. From middle Carboniferous to late Carboniferous, the basin contracted and became shallow, and shallow water carbonate platforms were widely distributed. In Early Permian, it was mainly composed of a set of littoral and shallow sea clastic rocks and carbonate deposits of open platform facies. At the end of Early Permian, the Dongwu movement caused the crust to split again. Until the early and Middle Triassic, it was again in the maximum extension period of the basin, The sedimentary facies changed from shallow shelf facies dominated by early Triassic argillaceous rocks to bathyal abyssal trough basin facies dominated by Middle Triassic turbidity current deposits. After the Middle Triassic Indosinian movement, Guangxi became a continent and entered the development stage of the Pacific continental margin Due to the strong stretching activity of the NW trending Nandan Kunlunguan fault zone, the ne NNE strike slip fault is inced, and the strike slip compression is accompanied by the extension. The strike slip compression resulted in the local uplift of the basin and the development of reefs and carbonate platforms. The west side of the uplift was characterized by tension fracture, forming a secondary depression, depositing siliceous rocks, siliceous mudstones and marls. The uplift area makes the water body in the depression area in a relatively closed state, and the secondary depression becomes a favorable place for mineralization enrichment The strata in the area are exposed from Lianhuashan formation of Lower Devonian to Liujiang formation, Wushan formation and tongchejiang formation of Upper Devonian, as well as Carboniferous, Permian, lower middle Triassic and Quaternary. The lithology of host rock is mainly black carbonaceous mudstone intercalated with carbonaceous siliceous rock of Lower Devonian Tangding formation; Reef limestone of nabiao formation in Middle Devonian, carbonaceous mudstone and argillaceous limestone of Luofu formation; Siliceous rocks of Upper Devonian Liujiang formation, carbonate rocks and siliceous rocks of Wushan formation, shale and marl of tongchejiang formation; Lower Carboniferous Datang stage limestone, chert bearing limestone with argillaceous limestone and siliceous rockthe magmatic activity in the area is relatively strong, mainly the late Yanshanian intermediate acid intrusive rocks, which are distributed in Longxianggai, Dachang, MANGCHANG and other places. The rock types include biotite granite, granite porphyry, quartz diorite porphyrite, quartz porphyry, dacite porphyry, granite and a small amount of diabase porphyrite, belonging to hypabyssal ultrahypabyssal intrusive body, mainly composed of stock, dyke, dyke, quartz porphyry, dacite porphyry and a small amount of diabase porphyrite It occurs in the form of rock bed and rock branch. Volcanic rocks are not well developed in Danchi basin. According to relevant data, marine volcanic rocks occur in Upper Devonian Wushan formation, tongchejiang formation and lower Carboniferous, with basic, medium basic and acidic subvolcanic rocks, lava, tuff, etc. (Zeng Yunfu et al., 1993; Zhang Qingcai, 1995; Han FA et al., 1997)
II. Main geological characteristics of the metallogenic series of the deposit
the metallogenic series of the deposit is composed of four deposit types (Longtou type, Dachang type, Yilan type and Wuwei type). The main geological characteristics of each deposit type are shown in table 4-4
Table 4-4 metallogenic series of Late Paleozoic hydrothermal sedimentary manganese tin polymetallic deposits in northern Guangxi (Danchi) area; Besides tin mineralization, there are zinc, antimony, lead, mercury, arsenic, silver, sulfur and associated gallium, cadmium, indium, bismuth mineralization which can be comprehensively utilized. Tin polymetallic deposits mainly occur in the middle of Danchi basin, such as Dachang and MANGCHANG, and graally become lead-zinc, antimony and mercury mineralization (such as Wuwei ore field) or single mercury mineralization (such as Wanbaoshan, MANGCHANG) towards both ends of the basin and the edge of the basin Yilan mercury deposit), and there is a single manganese mineralization in the south-east end of the basin (Fig. 4-8); There are high temperature tin ore, high and medium temperature lead-zinc ore and low temperature antimony, mercury, arsenic and silver mineralization
(2) the metallogenic tectonic environment is Danchi rift trough, and the sedimentary environment is platform trench facies, only Longtoushan deposit is reef facies at the edge of platform trench (3) the ore controlling strata are obvious, mainly Devonian, and then lower Carboniferous, including Tangding formation of Lower Devonian, nabiao formation, Luofu formation, Donggangling formation of Middle Devonian, Liujiang formation and Wushan formation of Upper Devonian, and datangian stage of Lower Carboniferous Wushan formation is the main ore bearing horizon, such as Dachang Longtoushan, MANGCHANG Dashan, Ma'anshan, Wuxu jianzhupo and sanpaidong deposits. The ore bearing horizon of Changpo Tongkeng deposit and Yilan mercury deposit mainly occurs in the Liujiang formation and Wushan formation, while Longtou manganese deposit occurs in the lower Carboniferous Datang stage. The lithology of host country rocks includes siliceous limestone mudstone assemblage, such as Changpo Tongkeng Tin polymetallic deposit and Longtou manganese deposit; Reef limestone, such as Longtoushan tin polymetallic deposit The deposits are composed of carbonaceous shale, siltstone and marlstone, such as dafuolouxi (zinc) deposit, jianzhupo deposit and sanpaidong Pb Zn sb Ag deposit (4) the distribution of ore fields and deposits is obviously controlled by the secondary depression on the side of the secondary uplift in the rift basin. There are Mayang, MANGCHANG, Dachang, BEIXIANG, Wuwei, Longtou (Liucheng) and Luofu uplift in the basin from northwest to Southeast. Correspondingly, there are Wanbaoshan deposit, MANGCHANG deposit, Dachang deposit, BEIXIANG deposit, Wuwei deposit, Longtou deposit and Yilan deposit in the west side of the uplift area The deposits are also equidistant (Fig. 4-9) The ore bodies are mainly layered, stratoid and lenticular, and the vein and veinlet ore bodies are also well developed. The former is generally integrated with the strata and folded synchronously, reflecting its synsedimentary characteristics. The veinlet mineralization in the latter, as mentioned above (Section 8, Chapter 3), is mainly formed in diagenetic stage or syntectonic stage, and strictly occurs in the layered ore bodies, However, the ore bodies with large vein shape are related to late magmatism after the formation of layered ore bodies, and have no direct genetic relationship with hydrothermal sedimentation mineralization
Fig. 4-9 structural location and mineral distribution diagram of Danchi metallogenic belt (according to Han FA et al., 1997; The mineral composition of Dachang type and Wuwei type deposits is more complex than that of Yilan type and Longtou type deposits. There are many kinds of minerals in Dachang type deposits. According to incomplete statistics of Changpo Tongkeng deposit, there are 74 kinds of minerals (Lai lairen et al., 1984). The main mineral components are cassiterite, marmatite, pyrrhotite, pyrite, arsenopyrite, galena, jamesonite, quartz, calcite, tourmaline, potash feldspar, sericite, etc. There are many kinds of minerals in Wuwei type deposits, including marmatite, jamesonite, stibnite, pyrite, orpiment, realgar, manganese siderite, quartz, dolomite, calcite, etc. The difference between Wuwei type deposit and Dachang type deposit is that there is generally no or only a small amount of cassiterite in the deposit, the arsenic bearing minerals are mainly realgar and orpiment, but not arsenopyrite, and pyrrhotite is also rare. The nonmetallic minerals generally do not contain tourmaline, which generally reflects that the mineralization temperature of Wuwei type deposit is lower than that of Dachang type deposit, so the minerals with higher temperature, such as cassiterite, arsenopyrite, pyrrhotite Tourmaline and other minerals are not developed or proced, on the contrary, stibnite, realgar, orpiment and other minerals at medium and low temperature are more developed. The mineral composition of Yilan type mercury deposit is single, and the main minerals are cinnabar, calcite and quartz. In addition to cinnabar, there are pyrite, pyrite, realgar, orpiment, stibnite, sphalerite, galena, chalrite and other minerals, reflecting the characteristics of low or medium low temperature mineralization. The Longtou type manganese deposit is characterized by the development of manganese minerals, especially manganese bearing carbonate minerals, which are mainly manganese calcite and manganese bearing calcite, followed by rhodochrosite, calcium rhodochrosite, and a small amount of limonite, sulfur manganese, etc The occurrence of pyrolusite and barite reflects the mineralogical characteristics of hydrothermal sedimentary mineralization
The ore texture is similar, and the ore mineral grain size of each deposit type deposit is relatively fine, generally with micro fine grain structure or fine particlesThe geochemical characteristics of strata are one of the important factors determining the metallogenic conditions. The Devonian is the first caprock on the Caledonian fold basement and the main ore bearing strata in Dachang area. The basement belongs to lower Paleozoic to Precambrian. Chen Yuchuan (1993) summarized that the Lower Devonian strata in northern Guangxi are rich in W, Sn, Au, as, Pb, th and V according to the frequency comparison of high background content of ore-forming elements in similar rocks; The Middle Devonian nabiao formation is rich in V, Ni, Sb and Zn; The upper Devonian Liujiang formation is rich in Sn, Cu, Au, Sb, V, th, Mn and P (Table 5-1); However, W, Sn, V, Fe, Mn and Co are enriched in the basement Sibao group; The Danzhou group is rich in th, Fe, Cr and Co; Cambrian is rich in th, P, Au, as, Sn and Pb; The lower Ordovician is rich in Cu, Ni, Mo and V. It is considered that the basement strata have the conditions to provide ore-forming materials for the overlying strata
Table 5-1 contents of main ore-forming elements of Devonian System in northern Guangxi (W < sub > b < / sub > / 10 < sup > - 6 < / sup >)
Dachang mining area is located in the middle of Danchi metallogenic belt. The analysis results of trace and ore-forming elements of Devonian System in Dachang periphery and mining area by Cai Hongyuan et al. (1985) and Li Xiaoquan et al. (1988) are shown in table 5-2, The results show that: (1) the whole Devonian system around the mining area is rich in ore-forming elements, but the abundance is different in different strata. For example, the content in argillaceous rock is high, followed by carbonaceous shale and carbonate rock, and the content in siliceous rock is relatively low. For example, Zn is most enriched in the Lower Devonian Tangding formation and the Middle Devonian Luofu formation (especially Luofu formation), and the enrichment degree is weakened in the upper Devonian; Compared with the background value in northern Guangxi, the Sn content in Wushan formation of Upper Devonian is close to the regional background value, while the Sn content in Lower Devonian and Middle Devonian is obviously lower than the background value; Cu is relatively enriched in nabiao formation, Luofu formation of Middle Devonian and Liujiang formation at the bottom of Upper Devonian, which is 1.5-2 times higher than the background value in northern Guangxi, but lower than the background value in Tangding formation of Lower Devonian and fine banded limestone and lentil limestone of Upper Devonian (Fig. 5-1)
Table 5-2 comparison of element contents (W < sub > b < / sub >) in Dachang mining area and its periphery; Li Xiaoquan et al., 1988)
Fig. 5-1 comparison of main ore-forming elements in the periphery of Dachang mining area and ore bearing strata of the mining area
2) the content of ore-forming elements Sn, Pb, Cu, W, as, Sb, Ag in the mining area is one to several times higher than the background value of the periphery of the mining area and Northern Guangxi, especially rich in S and organic carbon. Compared with the periphery of the mining area, the variation of element content in the mining area is not completely consistent in different stratigraphic units. The contents of Sn, Zn, Cu, as, Ag and Mn in Tangding formation generally increased, while Pb, Ba, as and Sb decreased; In the nanoscale group, Sn, Pb, Ag, as, Sb, Mn increased, while Cu, Zn, W, Ni, Co, Ba, Sr, P decreased; The Zn content of Luofu formation is the highest in the area, with an average of 212.05% × The contents of Sn, Cu, W, Rb, Sr, as and s increased, while the contents of Pb, Ba and Hg decreased; The contents of Sn, Cu, Pb, Zn, Ag, Sr and BA in siliceous rocks increase except Ba, P and F; In the middle part of Upper Devonian, the content of Zn in Wushan formation is obviously lower than the background value, and the content of other elements is higher than the corresponding elements in the periphery, but the increase range is different, for example, the content of Sn is higher than that in Luofu formation of Middle Devonian and Liujiang formation of lower part of Upper Devonian
(3) the content of main ore-forming elements in the mining area is higher than the background value in the periphery of the mining area and Northern Guangxi, which may be related to the migration process of fluid rich in ore-forming elements. The original strata can not be highly enriched in ore-forming materials, and the high content of elements in the strata may be caused by the filling or replacement of favorable strata by ore-forming fluids rich in ore-forming elements under favorable geological conditions1. Walk about 310m from Guangzhou station to Guangzhou railway station
2. Take Metro Line 2, pass 7 stations to Changgang station
3. Take Metro Line 8, pass 7 stations to Xingang east station
4. Walk about 480m to Pazhou Convention and Exhibition Center
3. Take No.33 (take 2 stops) from Guangzhou railway station Take bus No.180 (take 3 stops) to Jiefang North Road station. Walk about 170 meters to Jinhan Exhibition Center
4. Take bus No.2 (take 1 stop) to Yuexiu Park Station D2 entrance and exit from Guangzhou railway station A. take bus No.211 (take 1 stop) to Yuexiu Park station. Walk about 70 meters to Jinhan Exhibition Center
5 Jinhan Exhibition Center
6. Take No.8 night train from Guangzhou railway station to Yuexiu Park station. Walk about 240 meters to Jinhan Exhibition Center
7. Take No.31 bus from Guangzhou railway station to General Hospital of Guangzhou Military Region. Walk about 410 meters to Jinhan Exhibition Center
8. Walk about 280 meters from Guangzhou railway station to Caoyan Park Station, take No.5 bus (2 stations) Take bus No.7 (2 stops) and bus No.42 (2 stops) to Jiefang North Road station. Walk about 170 meters to Jinhan Exhibition Center
The bus route from Guangzhou railway station to Xingang East International Convention and Exhibition Center is as follows:
mode 1:
bus route: Metro Line 2 → Metro Line 8, the whole journey is about 15.4km
1. Take Metro Line 2 from Guangzhou railway station, pass 7 stations, and reach Changgang station
2. Take Metro Line 8, pass 7 stations, and reach Xingang east station
3. Walk about 80m, To get to the International Convention and Exhibition Center
mode 2:
bus line: Metro Line 5 → Metro Line 3 → Metro Line 8, the whole journey is about 15.0km
1. Take Metro Line 5 from Guangzhou railway station, pass 7 stations to Zhujiang New Town Station
2. Take Metro Line 3, pass 2 stations to Kecun station
3. Take Metro Line 8, pass 3 stations to Xingang east station
< P > 4 Walk about 80 meters to the International Convention and Exhibition Center