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Yang, Xiao-Yong
- Geological and Geochemical Characteristics of Source Rocks of Carbon Dioxide in Deep Strata of Northern Songliao Basin, Northeast China
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Authors
Affiliations
1 School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, CN
2 School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, CN
3 School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, IN
4 Institute of Geologic Survey of Jiangsu Province, Nanjing 210018, CN
5 Exploration Department, Daqing Oilfield Company Ltd, PetroChina, Daqing 163453, CN
1 School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, CN
2 School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, CN
3 School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, IN
4 Institute of Geologic Survey of Jiangsu Province, Nanjing 210018, CN
5 Exploration Department, Daqing Oilfield Company Ltd, PetroChina, Daqing 163453, CN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 2 (2008), Pagination: 189-200Abstract
Based on studies of major element, rare earth element, fluid inclusion and absorbed gas, the possible source matters of carbon dioxide (CO2) and their potentialities to form gas accumulations in deep northern Songliao basin, NE China were addressed in this paper. Mantle-Derived magma, volcanic rocks, carbonate rocks and organlc matters are four kinds of potentia1 source matters, whose significances are degressive in turn and vertical distributions could be divlded into shallow, middle, deep and deeper levels. In shallow level, the source matters of CO2 are volcanic rocks and carbonation rocks with higher total carbon contents and absorbed CO2 contents, 0 24%-7 76% and 0 213%-1 387% respectively. The absorbed CO2 contents of volcanic rocks are negatively correlated wlth the S1O2 contents, and positively with the Na2O+K2O contents. The principal source matters are metamorphic carbonate rocks in middle level and mantle-Derived magma in deep and deeper levels. Higher CO2 abundance in magmatic systems correspondng to deep volcanic rocks could be suggested by characteristics of lithogeochemistry and fluid inclusion as well as tectonic setting. The volcanic rocks of Yingcheng Formation and corresponding magmatic activities are the most favorable CO2 source matters in northern Songliao Basin.Keywords
Carbon Dioxide, Source Matters, Volcanic Rock, Northern Songliao Basin.- Trace Element Geochemistry of some Mesozoic Yanshanian Copper-Gold Deposits on Anhui Middle-Lower Yangtze Metallogenic Valley, Central-East China
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Authors
Affiliations
1 CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University Science and Technology of China, Hefer 230026, CN
1 CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University Science and Technology of China, Hefer 230026, CN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 2 (2007), Pagination: 235-251Abstract
Yangtze valley is one of the most important metallogenic regions in the Jurassic-Cretaceous penod in East Asian continent, where more than 200 polymetallic Cu-Fe-Au and Mo, Zn, Pb, Ag deposits are documented Cu-Au deposits in Anhui Province (Lower part of Yangtze) are the most important among these deposits. Data of chemical compositions of trace elements were collected from literature for Yanshanian (Mesozoic) igneous rocks which have close relationship with the Cu-Au mineralization. The Cu -Au mineralization in middle to lower Yangtze valley can be divided into three types mainly skarn type, porphyry type and volcanic type. In this paper, the details of trace and rare earth elements from Shaxi, Anqing, Chuxian, Tongling and Luzong Cu-Au bearing deposits are dealt with in detail Rocks in the localities of Shaxi, Chuxian and Anqing intrusives have almost similar REE distribution patterns which show little assimilation with the wall rocks during the formation of Cu-Au deposits. However, the REE distribution patterns in Tongling skarn deposit are different altogether when compared to the other Cu-Au related rocks adjacent to areas of Mesozoic intrusives. This might have resulted due mainly to the volatile transport or assimilation of some elements producing complex patterns of trace element distributions superimposed on effects caused by crystal/melt equilibra. The trace element distribution shows that the mantle compatible elements such as Sc, Cr, Co and Ni and some transitional compatible elements such as Ti, V, Mn, Fe and Cu have strongly fractionated compared to the average contents of trace elements of crustal rocks, especially those of Cu, with very largely positive anomaly. This could be interpreted as an important crustal-mantle interaction during the Yanshania (Mesozoic) period when the multiple Cu-Au mineralization formed in the Yangtze metallogenic belt in China. The lithophile elements such as K,Rb, Th, Sr, Ba, Li and La are also enriched compared to the average contents of the crustal rocks, reflecting the regional geochemical anomalies of these elements and may be interpreted as an important reason of Cu-Au mineralization in this region.Keywords
Cu-Au Deposits, Trace and REE Elements, Jurassic-Cretaceous, Yangtze metallogenic, Province, Anhui, Eastern China.- Geochemical Study of Shaxi Porphyry Copper-Gold Deposit in Southern Part of Tan-Lu Fault Belt, East China
Abstract Views :199 |
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Authors
Affiliations
1 school of Earth and Space Sciences, Advanced Center for Earth Sciences and Astronomy of the Third World Academy of Sciences, University Science and Technology of China, Hefei 230026, CN
2 Department of Geology, University of New Brunswick, Fredericton, NB, E3B 5A3, CA
3 Anhui Academy of Geology and Survey, Hefei 230001, CN
1 school of Earth and Space Sciences, Advanced Center for Earth Sciences and Astronomy of the Third World Academy of Sciences, University Science and Technology of China, Hefei 230026, CN
2 Department of Geology, University of New Brunswick, Fredericton, NB, E3B 5A3, CA
3 Anhui Academy of Geology and Survey, Hefei 230001, CN