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Fluid evolution and mineralization mechanism of the East Kounrad porphyry Mo-W deposit in the Balkhash metallogenic belt, Central Kazakhstan
Cao, Chong1,2,3; Shen, Ping1,2,3; Pan, Hongdi4; Li, Changhao1,2,3; Eleonora, Seitmuratova5
2018-10-01
发表期刊JOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
卷号165页码:175-191
摘要The East Kounrad Mo-W deposit is located in the eastern part of the Balkhash metallogenic belt, Central Kazakhstan. The intrusion in the East Kounrad deposit is a Permain complex that includes medium- and fine-grained granites. Both the primary magma and hydrothermal fluids of the East Kounrad deposit are characterized by high fluorine and high oxygen fugacity, which would be important for the formation of high-grade large Mo deposit. Four mineralization stages are identified in this study. Stage I quartz-wolframite +/- molybdenite +/- fluorite veins, which were associated with intensively greisen alteration, were formed from fluids with high temperature (340-460 degrees C), high pressure (250-400 bars), high/low salinity (54.5 wt% and 3.4-10.2 wt%, respectively), and high oxygen fugacity with a fluid system of H2O-NaCl-CO2. Stage II quartz-molybdenite +/- pyrite veins, which were accompanied by K-feldspars-muscovite-fluorite alteration, were formed from fluids with medium-high temperature (260-400 degrees C), medium pressure (100-250 bars), high/low salinity (39.1-58.4 wt% and 2.4-11.7 wt%, respectively), and relatively low oxygen fugacity. After the main stage of W and Mo mineralization, stage HI quartz-pyrite +/- molybdenite veins, associated with quartz-sericite alteration, were formed from fluids with medium-low temperature (160-340 degrees C), low pressure (less than 100 bars), various salinity (4.5-46.2 wt%) and high oxygen fugacity. Stage IV quartz-polymetallic sulfide veins, related to argillic alteration, were formed under temperature of 120-220 degrees C and salinity of 1.7-8.1 wt%. Remarkably, fluid boiling is the most important precipitation mechanism of molybdenite and wolframite. In addition, the decreasing oxygen fugacity and temperature also play a vital role in triggering deposition of molybdenite. The Pb isotopic composition of sulfides shows that the ore-forming materials at East Kounrad are dominantly derived from the lower crust.
关键词High fluorine High oxygen fugacity Mineralization stages Precipitation mechanism Pb isotopic compositions East Kounrad Mo-W deposit
DOI10.1016/j.jseaes.2018.07.013
资助者National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China
关键词[WOS]ASIAN OROGENIC BELT ; FREEZING-POINT DEPRESSION ; ZIRCON U-PB ; NW CHINA ; GEOLOGICAL SIGNIFICANCE ; MOLYBDENUM DEPOSIT ; TECTONIC EVOLUTION ; CHEMICAL EVOLUTION ; GRANITIC MAGMAS ; MOUNT-PLEASANT
语种英语
资助项目National Natural Science Foundation of China[41390442] ; National Natural Science Foundation of China[U1303293] ; National Natural Science Foundation of China[41272109] ; National Key R&D Program of China[2017YFC0601201]
资助者National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000449447300011
出版者PERGAMON-ELSEVIER SCIENCE LTD
引用统计
被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/89462
专题矿产资源研究院重点实验室
通讯作者Shen, Ping
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Changan Univ, Coll Earth Sci, Xian 710054, Shaanxi, Peoples R China
5.K Satpaev Inst Geol Sci, Lab Geol Format, Alma Ata 050010, Kazakhstan
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Cao, Chong,Shen, Ping,Pan, Hongdi,et al. Fluid evolution and mineralization mechanism of the East Kounrad porphyry Mo-W deposit in the Balkhash metallogenic belt, Central Kazakhstan[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,165:175-191.
APA Cao, Chong,Shen, Ping,Pan, Hongdi,Li, Changhao,&Eleonora, Seitmuratova.(2018).Fluid evolution and mineralization mechanism of the East Kounrad porphyry Mo-W deposit in the Balkhash metallogenic belt, Central Kazakhstan.JOURNAL OF ASIAN EARTH SCIENCES,165,175-191.
MLA Cao, Chong,et al."Fluid evolution and mineralization mechanism of the East Kounrad porphyry Mo-W deposit in the Balkhash metallogenic belt, Central Kazakhstan".JOURNAL OF ASIAN EARTH SCIENCES 165(2018):175-191.
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