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The record of paleoclimatic change from stalagmites and the determination of termination Ⅱ in the south of guizhou.Province, China

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Science China Earth Sciences 2004年第1期47卷 1-12页

作者： ZHANG Meiliang YUAN Daoxian LIN Yushi CHENG Hai QIN Jiaming ZHANG Huiling Karst Dynamics Laboratory Institute of Karst GeologyChinese Academy of Geological SciencesGuilin 541004China Geography Department Minnesota UniversityMN 55455USA

A high-resolution climate record from 163.00 kaBP to 113.80 kaBP has been obtained through TIMS-U series dating and carbon and oxygen isotope analysis of the three large stalagmites from two caves in the south of guizhou.Province, China. The record of the oxygen isotopes from the stalagmites reveals that the undulation characteristics between the cooling event of the glacial period and the warming event of the interglacial period in the research area can compare well to those of ice cores, lake sediments, loess and deep sea sediments on the scale of ten-thousand years or millennium time scale. The climate undulation provided by the record of the stalagmites has a coherence with the global changes and a tele-connection to the paleoclimate changes in the north polar region. Our results suggest that the direct dynamics of paleo-monsoon circulation changes reflected in the record of the stalagmites might be caused by changes of the global ice volume, and in turn related to various factors, including the solar radiation strength at the mid-latitudes in the Northern Hemisphere, the southern extension of the ice-rafted event in the North Atlantic, and changes of the equatorial Pacific sea surface temperature at the low-latitudes. Using °18O values, we have calculated the temperatures and the results show that the temperature difference between the penultimate glacial period (with an average temperature of 8.1°C, and a minimum temperature range from 0.65°C to-1.43°C at stage 6) and the last interglacial period (with an average temperature of 18.24°C at sub-stage 5e) was about 10°C. This temperature difference from the record of the stalagmites corresponds in general to the record temperature variation (about 10°C) of measured ice cores. The climate records from the three stalagmites in the two caves have shown that the circulation strength of the Asian summer monsoon and the winter monsoon in the penultimate glacial period and the last inter-glacial period had a clear chang

关键词： stalagmite, paleoclimatic change, termination II, south of guizhou.

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Au-Sb association and fractionation in micro-disseminatedgold deposits, southwestern guizhou.—geochemistry andthermodynamics

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Science China Earth Sciences 2000年第2期43卷 208-216页

作者：朱赖民胡瑞忠 1. Institute of Geochemistry Chinese Academy of Sciences 550002 Guiyang China 2. No. 3 Institute of Oceanography State Ocean Bureau of China 361005 Xiamen China

The dual geochemical character of paragenesis and fractionation between gold, arsenic and antimony in micro-disseminated gold deposits in southwestern guizhou.is discussed in terms of spatial distribution of independent deposits, lateral and vertical enrichment, mineralization stage and factor and correlation analyses. Thermodynamic calculations of solubility and speciation of gold and antimony minerals indicate that gold is transported in hydrothermal solution as Au(HS) 2and antimony is mainly as Sb(OH)30 although HSb2S4 may be of increasing importance in acidenvironment at low temperatures during the late stage of mineralization. Changes in physico-chemical conditions hold the key to the association and fractionation between gold and antimony. Gold and antimony response differently to physicochemical variations because they are distinct from each other in soluble speciation and mineral solubility, leading to precipitation at different times and localities during hydrothermal evolution.

关键词： micro-disseminated gold deposits association and fractionation of ore metals thermodynamics southwestern guizhou.

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The *** climate abrupt events in the early and middle Holocene:Stalagmite oxygen isotope record from Maolan,guizhou.China

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Science China Earth Sciences 2005年第4期48卷 530-537页

作者： QIN Jiaming1, YUAN Daoxian1, CHENG Hai2, LIN Yushi1, ZHANG Meiliang1, WANG Fuxing1, R. L. Edwards2, WANG Hua1 & RAN Jingcheng3 1. The Karst Dynamic Laboratory, IKG, CAGS, Guilin 541004, China 2. Geology and Geophysics Department, Minnesota University, MN55455, USA 3. The Management of Maolan National Nature Reserve, Libo 558400, China 1. The Karst Dynamic Laboratory 541004 IKG CAGS Guilin China 2. Geology and Geophysics Department Minnesota University 55455 MN USA 3. The Management of Maolan National Nature Reserve 558400 Libo China

The isotope records which range from 3.9 kaBP to 15.7 kaBP with an average resolution of 90 a have been obtained from 45 cm to 193.6 cm of the upper part of D4 stalagmite from Dongguo Cave in Libo, guizhou. by using system TIMS U-series dating and carbon and oxygen stable isotope *** study indicates that the last cold event, the YD (Younger Dryas) event, of the last glacial period was apparently shown in D4 record, which started from 12.80 kaBP and ended in 11.58 kaBP, with a great range of drop in temperature. The end of the last glacial period was consistent with the termination I in oceanic isotope records and was with time limit of 11.3 kaBP. The three most distinct cold events in the early and middle Holocene occurred respectively in 10.91 kaBP, 8.27 kaBP and 4.75 kaBP, with a range of drop in tem- perature reaching 2—5℃. The climate abrupt events in thousand and hundred years scale re- corded in stalagmite δ O can be compared to those in GISP2 ice cores from Greenland in their 18 happening time and the range of their lasting time. The cold events in 8.27 kaBP and 4.75 kaBP can also be compared to CC3 stalagmite records in Ireland, which indicate that climate changes of short range in China monsoon areas, western Europe and polar regions, have the same driv- ing factor. This has a global significance. In addition, the trend of record curves in some time- stages is apparently different, which reflects probably the difference between environment in monsoon climate areas and in polar regions.

关键词： isotope record, climate event, stalagmite, Libo, guizhou.

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A new cyamodontoid placodont from Triassic of guizhou. China

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Chinese Science Bulletin 2002年第5期47卷 403-407,442页

作者： LI Chun & O. RieppelInstitute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China The Field Museum, Chicago, II 60605-2496, USA Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing China The Field Museum Chicago USA

A new cyamodontoid placodont is named (Pse-phochelys polyosteoderma gen. et. sp. nov.) and described based on a three-dimensionally preserved specimen. The material comes from the Wayao Member of the Falang Formation (Carnian, Late Triassic) in guizhou.Province, southwestern China. The skull of Psephochelys shows a unique combination of characteristics observed in Psepho-derma and Placochelys, and the carapace is diagnostic of a new taxon as well. The ventral dermal armor of Psephochelys differs from all other known cyamodontoids in that it comprises irregular marginal osteoderms in loose contact with each other, and gastralia between them. The cranial suture pattern is in part difficult to analyze due to apparent co-ossification of elements, or poor delimitation of sutures. This affects primarily the demarcation of the nasal from the prefrontal, and the relation between the anterior part of the parietal, posterior ends of the frontals, and postfrontals. However, the postfrontal appears to enter the

关键词： placodont Triassic guizhou.

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High resolution stalagmite δ18O records over the past 1000 years from Dongge Cave in guizhou

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Science Bulletin 2005年第10期50卷 1003-1008页

作者： HE Yaoqi1, WANG Yongjin1, KONG Xinggong1 & CHENG Hai2 1. College of Geography Science, Nanjing Normal University, Nanjing 210097, China 2. Department of Geology and Geophysics, Minnesota University, Mineapolis MN 55455, USA College of Geography Science Nanjing Normal University Nanjing 210097 China

Based on MC-ICP-MS U-series dating and stable O-isotope analysis results, a 4―5 years resolution monsoon record over the past 1000 years has been estab- lished for two stalagmites from Dongge Cave, guizhou. The high resolution oxygen isotope record serves as a proxy for variations in rainfall of Asian southwest monsoon over the Yunnan-guizhou.Plateau. A close relation of the δ 18O record with the ?14C record from tree rings largely reflects impact of centennial-scale solar activity on the monsoon climate changes. The conspicuous decrease in the δ 18O value at AD 1720 indicates an abrupt increase in monsoon rainfall, sug- gesting that an atmospheric-oceanic couple over the tropical Indian Ocean plays an important role in rapid increase of the Northern Hemisphere temperature over the last century.

关键词： cave stalagmite oxygen isotope southwest monsoon solar activity guizhou.

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Two kinds of Carlin-type gold deposite in southwestern guizhou.China

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Chinese Science Bulletin 1999年第2期44卷 178-182页

作者： Hanping Zhuang Jialan Lu Jiamo Fu Dehan Liu Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China

Based on the organic geochemical studies on two typical Carlin-type deposits in southwestern guizhou. as well as the comparison between the two deposits in terms of geological background,igneous rock, paleo-oilfield, lithofacies and paleogeographical and geochemical features, two kinds of Carlin-type deposit were proposed: Lannigou Type and Getang Type. The former includes Lannigou,Banqi and Yata gold deposits. These deposits are hosted by turbidite, geographically situated in the southwest of the mineralized district, and related genetically to paleo-oilfields. The latter includes Getang, Zimudang and Dachang gold (mercury and thallium) deposits, situated geographically in the northwest of the mineralized district where Emeishan basalt commonly occurs. These deposits are associated with reduction of coaly organic matter.

关键词： genetic type Carlin-type gold deposit southwestern guizhou.

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Two Mechanisms of Tufa Formation in the Cement Grouting Tunnels at Wujiangdu Hydropower Station of guizhou

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Chinese Science Bulletin 1994年第17期39卷 1468-1472页

作者：刘再华贺殿彬 Institute of Kant Geology MGMR Guilin 541004. PRC

Wujiangdu Hydropower Station of guizhou.is one of the biggest hydroelectric projects built in karst areas of China. It has a dam 165 m high, with a capacity of 630,000 kW. Its electric energy production is 3.34 billio... 详细信息

关键词： tufa formation karst processes aging of concrete Wujiangdu Hydropower Station guizhou.

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RECENT PROGRESS IN RESEARCH OF THE PERMIAN SYSTEM IN SOUTHERN guizhou

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Chinese Science Bulletin 1989年第4期34卷 309-311页

作者：张正华 guizhou.Petroleum Prospecting and Locating Command Department Guiyang

For a long time the Permian System in Southern China has been divided into two units, and the triple division suggestion has also been discussed abroad and at *** guizhou.is a favourable area for research in the Permian division. Here, the Permian strata are fully developed. They are of various sedimentary types and are abundant in fossils. In 1984, guizhou.Petroleum Prospecting and Locating Command Department of PIM have launched a research in the Permian System of south-

关键词： sedimentation fossils micro element Permian System Southern guizhou.

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Characteristics of rare earth elements in soils in guizhou.carbonate region

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Chinese Science Bulletin 1999年第S2期44卷 115-116页

作者： YAN Chongling~(1,2), HONG Yetang~1, WANG Shijie~1, FU Shunzhen~2, ZHU Keyong~2 and WU Shanqi~2 1. State Key Laboratory of Environmental Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 2. guizhou.Institute of Environmental Protection, Guiyang 550002, China State Key Laboratory of Environmental Geochemistry Chinese Academy of Sciences Guiyang 550002 China guizhou.Institute of Environmental Protection Guiyang 550002 China

IN recent years, rare earth element (REE) being used in agriculture has gained greater progress and madeus reach some common views. The centent of REE (especially soluble REE) in soils has significantcorrelation with that of REE plant absorbed from soil. Therefore, it is very necessary to clarify contentvariation and background values of REE (especially soluble REE ) from the angles of relation of supplyand demand between soil and plants, for reasonably using REE and formulating relevant health standardin the region, avoiding excessive using REE and taking up soil environmental capacity of REE to result insoil or water-body polluted and sometime for researching rock weathering, soil-forming process and soilclassification in the region. This note deals with characteristics of content and distribution of REE andsoluble REE in soils of guizhou.carbonate region.

关键词： rare earth element soil, Carbonate area, guizhou.

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Regularities controlling the distribution of halogens in the Danzhai epithermal Hg-Au deposit in guizhou.and their significance

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Chinese Science Bulletin 1999年第S2期44卷 146-148页

作者： ZHANG Qian, PAN Jiayong and SHAO Shuxun Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

HALOGENS, as mineralizer elements, have been attracting ever increasing attention of geological workers inpetrogenetically experimental and ore-forming fluid geochemical studies. However, little research workhas been done on the contents, variation characteristics and significance of halogens in solid ores(rocks). It is found in the study of the Danzhai Hg-Au deposit that (i) variations in the contents ofhalogens and their distribution regularities in solid rocks and ores can shed light on the formation of thedeposit; and (ii) halogens can serve the function of indicator elements in search of buried orebodies. 1 Main characteristics of the ore

关键词： distribution regularity halogens Danzhai epithermal Hg-Au deposit guizhou.

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