Sample records for 地球化学 (geochemistry)
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12

“吐哈天窗”卡拉塔格岩体的地球化学和岩石成因 Geochemistry and petrogenesis of the Kalatag intrusion in the "Tuha window"

LI Wen-qian(李文铅); WANG Ran(王冉); WANG He (王核); XIA Bin(夏斌)

卡拉塔格岩体是吐哈盆地南缘古生代天窗中唯一的一个岩体。主量元素特征表明卡拉塔格岩体属富钠的钙碱性系列;岩石富集轻稀土和Ba、K、La等大离子亲石元素,而亏损Th、Nb、P和Ti等高场强元素,具弱的Eu负异常,具有低的sr同位素比值和高的εNd(t)值(+7.74~+9.13)。这些特征表明:(1)卡拉塔格岩体具有俯冲带幔源岩石的成分特点,反映其形成于岛弧环境。(2)卡拉塔格岩体来源于亏损地幔源区,且基本上未受到古老大陆地壳物质的污染,其形成与康古尔古大洋板块向北的俯冲分熔作用具有直接的成因关系。(3)该岩体的总体特征表明,吐哈盆地南缘在早古生代晚期为一活动的大陆边缘环境,卡拉塔格斑岩型金铜矿的...

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13

Zircon U-Pb and Sr-Nd-Hf isotopic study of mafic intrusions from the Chinese Altai. Implications for the Paleozoic tectonics

Cai, KD; Sun, M; Yuan, C; Zhao, GC; Xiao, WJ; Long, XP; Wu, FY

Annual National Symposium on Petrology and Geodynamics, Guiyang, China, 18-24 October 2008.

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14

Tropospheric pyruvate changes in the remote area of northwestern China Tropospheric pyruvate changes in the remote area of northwestern China

Li XinQing;Qin DaHe;Jiang Wei;Jiang Qian(李心清)

Financial support by the National Natural Science Foundation of China( Grant No. 40073035 ) and the Chinese Acadeny of Sciences.

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16

Trace Element Geochemistry of the Permian/Triassic Boundary Section in the Selong—Xishan Area,Nyalam County,Southern Tibet,China

吴明清; 陈楚震; 等

Samples were collected f5rom the Selong-Xishan Permian/Triassic boundary strata,Nyalam County in southern Tibet and systematically analyzed for their rare-earth elements(REE) and trace elements such as U,Th,Sr,Ba,Sc,Ta,Hf,Rb,Cs,Co,Ni,Cr,As and others with emphasis put on the distribution patterns of...

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17

The Paleo-Environmental Significance of Sr and Ca Contained in Acid-Soluble Fraction of Plateau Loess Deposits in Xining Basin

谭红兵; 马海州; 鹿化煜; 张西营; 魏海珍

The Xining Basin,located on northeastern Qinghai-Xizang Plateau,is adjacent to the Qaidam Bsim and Gobi-desert.Therefore,thick,integrated deposits of loess or paleo-sol sequence were well developed.As is well known,there is much paleo-environmental information recorded in loess and plaeo-sol.So if w...

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19

Tectonic evolution of the northern part of Western Tianshan (Xinjiang, NW China).

Wang, Bo; Shu, Liangshu S.; Cluzel, Dominique; Faure, Michel; Charvet, Jacques

The Yili Block is important for understanding the Late Paleozoic geodynamic evolution of Central Asia. It is bounded to the north by the Northern Tianshan Carboniferous flysch and ophiolitic mélange. The center of the Block is dominated by Carboniferous sedimentary rocks with intercalation of volcan...

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20

Sulphur-containing compounds in sulphur-rich crude oils from hypersaline lake sediments and their geochemical implications

Sinninghe Damsté, J.S.; Guoying, S.; Jiamo, F.; Brassell, S.C.; Gowar, A.P.; Eglinton, G.; Leeuw, J.W. de; Schenck, P.A.

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21

Study on Modern Plant C-13 in Western China and Its Significance

张成君; 陈发虎; 金明

Organic carbon isotopic composition(δ^13C) is one of the important proxies in paleoenvironment studies.In this paper modern plant δ^13C in the arid areas of China and Tibetan Plateau is studied.It is found that most terrestrial plant species in western China are C3 plants with δ^13C values ranging f...

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22

Structural, Mineralogical, and Geochemical Characterization of the Chelungpu Thrust Fault, Taiwan

Isaacs, Angela J.; Evans, James P.; Song, Sheng-Rong; Kolesar, Peter T.

The Chelungpu fault, Taiwan, produced a northward propagating ruptureon 21 September 1999 resulting in a Mw 7.6 earthquake with a ~90 kmlong N-S trending fault scarp. The mineralogic and physical character ofthe fault-related rocks within the Chelungpu fault zone, as measured at9 sites along 70 km o...

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28

Sediment Particle Size Distribution and Its Environmental Significance in Lake Erhi,Yunnan Province

陈敬安; 万国江; 等

A closed or semi-closed plateau lake,whose sediment records can provide uw with plenty of fine and high resolution information,is a sensitive indicator of climatic and environmental changes.During the reconstruction of various short-time-scale climatic and environmental changes,the geochemical reco...

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29

Seasonal trace-element and stable-isotope variations in a Chinese speleothem: the potential for high-resolution paleomonsoon reconstruction

Johnson, Kathleen R.; Hu, Chaoyong; Belshaw, Nick S.; Henderson, Gideon M.

We report the presence of clear annual cycles in trace-element (Mg/Ca, Sr/Ca, Ba/Ca, and U/Ca) and stable-isotope (δ¹⁸O and δ¹³C) composition in an annually banded stalagmite from Heshang Cave, Hubei Province, China (30.44°N, 110.42°E). Through a combination of micromilling and in situ analysis (LA-...

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30

REE Geochemical Study of the Permian—Triassic Marine Sedimentary Environment in Guizhou Province

南君亚; 周德全; 等

This paper deals with the REE geochemical characteristics of Permian-Triassic marine carbonate rocks in Guizhou Province.It is found that there are two broad categories of strati-graphic units in the region studied in accordance with their ΣREE contents and REE distribu-tion patterns:one is characte...

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33

Paleozoic tectonics of the southern Chinese Tianshan: Insights from structural, chronological and geochemical studies of the Heiyingshan ophiolitic mélange (NW China)

Wang, Bo; Shu, Liangshu S.; Faure, Michel; Jahn, Bor-Ming; Cluzel, Dominique; Charvet, Jacques; Chung, Sun-Lin; Meffre, Sébastien

In the southern Chinese Tianshan, the southernmost part of the Central Asian Orogenic Belt (CAOB), widespread ophiolitic mélanges form distinct tectonic units that are crucial for understanding the formation of the CAOB. However, the timing of tectonic events and subduction polarity are still in con...

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36

Modeling on gas hydrate formation conditions in the Qinghai-Tibet plateau permafrost

Lu Zhen Quan; Sultan Nabil; Jin Chun Shuang; Rao Zhu; Luo Xu Rong; Wu Bi Hao; Zhu You Hai

Based on field investigated gas geochemistry and predecessors' data such as the permafrost ground temperature, thermal gradients within/below the frozen layer, the modeling on gas hydrate formation conditions is conducted in the Qinghai Tibet plateau permafrost. The modeled results show that the per...

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43

Hydrogeochemical processes of thallium in a rural area of Southwest Guizhou, China Hydrogeochemical processes of thallium in a rural area of Southwest Guizhou, China

HE Libin (何立斌); XIAO Tangfu (肖唐付); LI Hang (李航); and SUN Wei(孙伟)

Acknowledgements This research project is supported by the Canadian International Development Agency (Project No. CIDA/SULCP 01282/19156) and the Chinese Academy of Sciences (Project No. KZCX2-105).

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44

High—Resolution Dating of Stalagmites and Reconstruction of Paleo—Environments

王兆荣; 袁道先; 等

The discovery of abrupt paleo-climate change events and the prediction of environmental changes in the future time have raised an urgent request for high-resolution paleo-environmental records.This paper reviews the progress made in hronology and paleo-environment of stalagmites from karst caves in ...

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53

Geochemical constraints on carboniferous volcanic rocks of Yili Block (Xinjiang, NW China) ; implication for the tectonic evolution of western Tianshan.

Wang, Bo; Shu, Liangshu S.; Cluzel, Dominique; Faure, Michel; Charvet, Jacques

The Yili Block is important for understanding the Late Paleozoic geodynamic evolution of Central Asia. It is bounded to the north by the Northern Tianshan Carboniferous flysch and ophiolitic mélange. The center of the Block is dominated by Carboniferous sedimentary rocks with intercalation of volcan...

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54

Geochemical Evolution and Environmental Changes of Qinghai—Xizang Plateau Since Late Cenozoic

余素华; 文启忠; 等

Long-and short-term climatic curves were preliminarily established based on the comprehensive analysis of geochemical information since the Late Cenozoic in the Qinghai Xizang(Qinghai-Tibet)Plateau.The curves show that the climate in the plateau was alternatively dry-warm and cold-wet during the per...

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57

Evolution of calc-alkaline to alkaline magmatism through Carboniferous convergence to Permian transcurrent tectonics, western Chinese Tianshan

Wang, B; Cluzel, D; Shu, L; Faure, M; Charvet, J; Chen, Y; Meffre, S; de Jong, K

Continuous magmatic activity occurred in the western Chinese Tianshan, Central Asia, from the Carboniferous to the Permian, i.e. before and after the Late Carboniferous amalgamation of Junggar and the Yili Blocks. Zircon U-Pb LA-ICPMS and Ar-Ar data reveal a coincidence in time between regional wren...

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58

Evolution of calc-alkaline to alkaline magmatism through Carboniferous convergence to Permian transcurrent tectonics, western Chinese Tianshan

Wang, Bo; Cluzel, Dominique; Shu, Liangshu S.; Faure, Michel; Charvet, Jacques; Chen, Yan; Meffre, Sébastien; De Jong, Koenraad

Continuous magmatic activity occurred in the western Chinese Tianshan, Central Asia, from the Carboniferous to the Permian, i.e. before and after the Late Carboniferous amalgamation of Junggar and the Yili Blocks. Zircon U–Pb LA-ICPMS and Ar–Ar data reveal a coincidence in time between regional wren...

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60

Environmental Geochemistry of Fluorine in the Rock—Soil—Water System in the Karst Region of Central Guizhou Province

朱立军; 李景阳; 等

Systematic determination of and adsorption experiment on fluorine in the carbonate rock-soil-water system in the karst region studied in Guzhou Province,in conjunction with the mineral surface and soil chemistry data,have revealed the geochemical characteristics of F and the mechanisms of its trans...

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61

Environmental Evolution of the Water Body of Qinghai Lake since the Postglacial Age

张彭熹; 张保珍; 等

Based on the data developed from various s natural waters in the Qinghai Lake area and ostracode shells present in drill core QH-16A of recent lake-floor sediments ,this paper discusses the distribution of stable isotopes in the modern water body of Qinghai Lake,and the initial isotopic composition ...

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64

Wong, Po-wan, Kenny; 王步雲

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65

Schnabel, C

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66

Mackenzie, A

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67

Mackenzie, A

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68

Mackenzie, A

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69

Mackenzie, A

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