滇东南安那金矿床成矿流体地球化学研究
Study on the ore-forming fluid geochemistry of the Anna gold deposit in southeastern Yunnan Province, China
查看参考文献65篇
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文摘
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云南安那金矿床位于右江盆地南缘,产于二叠纪辉绿岩侵入体之中,广泛发育乳白色石英网脉,蚀变辉绿岩体即为金矿体。与右江盆地以沉积岩为容矿岩石的卡林型金矿床类似,具有硅化、粘土化、碳酸盐化和硫化物化等热液蚀变特征。本文对安那金矿床石英中的流体包裹体岩相学、显微测温学、激光拉曼光谱以及氢氧同位素组成进行了分析,发现成矿期石英中的流体包裹体主要为富含CO_2气-液两相或三相流体包裹体,其均一温度范围为208~312℃(平均254℃),盐度很低,变化范围为0~2% NaCleqv,成矿溶液的密度为0.88 ~0.98g/cm~3,表明形成安那金矿床的成矿流体属于中温、低盐度、中-低密度的流体。激光拉曼光谱分析显示,石英中包裹体的气相成分富含CO_2、N_2以及微量CH_4等挥发分。成矿流体的氢氧同位素组成显示变质流体成因,结合矿石显微岩相学结构,认为流体溶蚀交代辉绿岩中的含Ti-Fe辉石或者钛铁矿,溶解Fe的硫化作用过程是含Au黄铁矿和毒砂沉淀富集的重要机制。成矿作用可能与右江盆地南缘印支期造山事件有关。 |
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其他语种文摘
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The Anna gold deposit is located at southeastern Yunnan, China, and is hosted in altered Permian diabase intrusion, with intensive milky quartz veins and vienlets. Alteration caused silicification,argillization, carbonatization and sulfidation, similar to those in the sediment-hosted Carlin-type gold deposits in the Dian-Qian-Gui “ Golden Triangle “ of Southwest China. Petrography,microthermometry,laser Raman spectroscopy analyses of fluid inclusions in quartz,and hydrogen and oxygen isotopic compositions of quartz are used to characterize the ore-forming fluids associated with gold mineralization in the southeastern Yunnan. The results show that the fluid inclusions in quartz are mainly two- or three-phase, aqueous-carbonic inclusions and have higher homogenization temperatures (208 ~312℃) and low salinities of 0 ~2% NaCleqv, with high density of CO_2 and N_2 vapor. Hydrogen and oxygen isotopic compositions of ore fluids (δD = -79‰ ~-47‰, δ~(18)O =8.9‰ ~ 12.7‰) indicate a metamorphic origin, possibly related to Indosinian orogeny along the southern margin of Youjiang basin during Late Permian to Early Triassic time. |
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来源
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岩石学报
,2016,32(11):3321-3330 【核心库】
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关键词
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流体包裹体
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氢氧同位素
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金矿床
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滇东南
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地址
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳, 550081
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0569 |
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学科
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地质学 |
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基金
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国家973计划
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国家自然科学基金项目
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矿床地球化学国家重点实验室领域前沿项目
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中国科学院贵阳地球化学研究所矿床地球化学中国科学院重点实验室基金
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文献收藏号
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CSCD:5846918
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参考文献 共
65
共4页
|
|
1.
Burruss R C. Analysis of phase equilibria in C-O-H-S fluid inclusions.
Short Course Handbook,6,1981:39-74
|
CSCD被引
1
次
|
|
|
|
|
2.
Chen M H. Re-Os isochron ages for arsenopyrite from Carlin-like gold deposits in the Yunnan-Guizhou-Guangxi " golden triangle ",southwestern China.
Ore Geology Reviews,2015,64:316-327
|
CSCD被引
49
次
|
|
|
|
|
3.
Chen M H. The Carlin-type gold deposits of the " golden triangle " of SW China: Pb and S isotopic constraints for the ore genesis.
Journal of Asian Earth Sciences,2015,103:115-128
|
CSCD被引
22
次
|
|
|
|
|
4.
Clayton R N. The use of bromine pentafluoride in the extraction of oxygen from oxides and silicates for isotopic analysis.
Geochimica et Cosmochimica Acta,1963,27(1):43-52
|
CSCD被引
208
次
|
|
|
|
|
5.
Diamond L W. Stability of CO_2 clathrate hydrate + CO_2 liquid + CO_2 vapour + aqueous KCl-NaCl solutions: Experimental determination and application to salinity estimates of fluid inclusions.
Geochimica et Cosmochimica Acta,1992,56(1):273-280
|
CSCD被引
15
次
|
|
|
|
|
6.
Epstein S. Six-year record of oxygen and hydrogen isotope variations in South Pole firn.
Journal of Geophysical Research,1965,70(8):1809-1814
|
CSCD被引
11
次
|
|
|
|
|
7.
Epstein S. Antarctic ice sheet: Stable isotope analyses of Byrd station cores and interhemispheric climatic implications.
Science,1970,168(3939):1570-1572
|
CSCD被引
10
次
|
|
|
|
|
8.
Friedman I.
Compilation of stable isotope fractionation factors of geochemical interest. Professional Paper 440-KK,1977:1-12
|
CSCD被引
1
次
|
|
|
|
|
9.
Groves D I. Archaean lode gold deposits.
Gold Metallogeny and Exploration,1991:63-103
|
CSCD被引
3
次
|
|
|
|
|
10.
Heinrich C A. Thermodynamic predictions of the hydrothermal chemistry of arsenic, and their significance for the paragenetic sequence of some cassiterite-arsenopyrite-base metal sulfide deposits.
Economic Geology,1986,81(3):511-529
|
CSCD被引
21
次
|
|
|
|
|
11.
Hofstra A H. Characteristics and models for Carlin-type gold deposits.
Reviews in Economic Geology,2000,13:163-220
|
CSCD被引
52
次
|
|
|
|
|
12.
Hofstra A H. Source of ore fluids in Carlin-type gold deposits, China: Implications for genetic models.
Mineral Deposit Research: Meeting the Global Challenge,2005:533-536
|
CSCD被引
4
次
|
|
|
|
|
13.
Hou L. Textures and in situ chemical and isotopic analyses of pyrite, Huijiabao trend, Youjiang basin, China: Implications for paragenesis and source of sulfur.
Economic Geology,2016,111(2):331-353
|
CSCD被引
46
次
|
|
|
|
|
14.
Hu R Z. Geology and geochemistry of Carlin-type gold deposits in China.
Mineralium Deposita,2002,37(3/4):378-392
|
CSCD被引
86
次
|
|
|
|
|
15.
Hu R Z. Multiple Mesozoic mineralization events in South China: An introduction to the thematic issue.
Mineralium Deposita,2012,47(6):579-588
|
CSCD被引
130
次
|
|
|
|
|
16.
Li Z Y. A new type of micro-disseminated gold deposits in association with diabase found in Yunnan and Guizhou provinces and Guangxi Zhuang Autonomous Region: Their geological characteristics and metallogenic conditions.
Chinese Journal of Geochemistry,2012,31(4):449-456
|
CSCD被引
2
次
|
|
|
|
|
17.
Naden J. Role of methane and carbon dioxide in gold deposition.
Nature,1989,342(6251):793-795
|
CSCD被引
61
次
|
|
|
|
|
18.
Nesbitt B E. Phanerozoic gold deposits in tectonically active continental margins.
Gold Metallogeny and Exploration,1991:104-132
|
CSCD被引
6
次
|
|
|
|
|
19.
Pokrovski G S. Stability and solubility of arsenopyrite,FeAsS, in crustal fluids.
Geochimica et Cosmochimica Acta,2002,66(13):2361-2378
|
CSCD被引
13
次
|
|
|
|
|
20.
Ridley J R. Fluid chemistry of orogenic lode gold deposits and implications for genetic models.
Reviews in Economic Geology,2000,13:141-162
|
CSCD被引
31
次
|
|
|
|
|
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