Unraveling the genesis of wolframite mineralization in the West Qinling Belt, China: Evidence from geochronology, geochemistry, and fluid inclusion study

被引：1

作者：

Li, Jize ^{[1
,2
]}

Liu, Jiajun ^{[1
]}

Carranza, Emmanuel John M. ^{[3
]}

Zhai, Degao ^{[1
]}

Zhao, Delong ^{[4
]}

Tang, Yanwen ^{[5
]}

Diao, Xi ^{[1
]}

Zhang, Fangfang ^{[1
]}

Wang, Yinhong ^{[1
]}

Wang, Jianping ^{[1
]}

机构：

[1] China Univ Geosci, Sch Earth Sci & Resources, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China

[2] China Geol Survey, Nat Resources Comprehens Survey Command Ctr, Beijing 100055, Peoples R China

[3] Univ Free State, Dept Geol, Bloemfontein, South Africa

[4] Second Geol & Mineral Explorat Inst Gansu Prov Bur, Lanzhou 730000, Peoples R China

[5] Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China

来源：

ORE GEOLOGY REVIEWS | 2024年 / 173卷

基金：

中国国家自然科学基金;

关键词：

U-Pb dating; Trace element; H-O isotopes; Fluid inclusion; Wolframite; West Qinling; LA-ICP-MS; AU-MO DEPOSIT; U-PB AGES; TECTONIC EVOLUTION; TUNGSTEN DEPOSIT; OROGENIC BELT; GOLD DEPOSIT; METALLOGENIC BELT; TRACE-ELEMENTS; GRANITE;

D O I：

10.1016/j.oregeorev.2024.106229

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

The West Qinling Belt is a pivotal part of the Central China Orogenic Belt renowned for producing abundant Au-polymetallic deposits. Nonetheless, reports of wolframite mineralization within this region were absent. The Xuehuashan deposit is the premier documented quartz-vein type wolframite deposit in West Qinling, which has significant implications of W mineralizing potential in the West Qinling Belt. The ore bodies are predominantly composed of wolframite-quartz veins and/or veinlets which are proximal or within the Late Triassic Baijiazhuang granitoid. To elucidate the age and genesis of the Xuehuashan wolframite mineralization, we presented analyses of U-Pb dating and chemical composition on wolframite, fluid inclusion study, and hydrogen-oxygen isotopes on wolframite and quartz. The Xuehuashan wolframite U-Pb dating yielded an age of 213.0 +/- 6.7 Ma, which is consistent with the age of the Baijiazhuang granitoid. The correlation among trace elements and the Y/Ho vs. Zr/Hf diagram suggests trace elements in wolframite were influenced by crystalline chemical factors and the geochemistry of parental ore-forming fluid. Homogeneous texture and stable chemical composition of wolframite, as well delta D vs. delta O-18 isotopes, suggest a single magmatic fluid from the Baijiazhuang granitoid. Fluid inclusions in wolframite and quartz have high homogenization temperatures and varying salinities of 0.4 - 16.4 wt%, suggesting that intense decompression and fluid boiling during fracture open caused the wolframite precipitation. Compared with the Late Triassic granitoids in the Qinling Belt, the Baijiazhuang granitoid shows higher ratios of Rb/Sr and lower ratios of Zr/Hf, K/Rb, Nb/Ta, LREE/HREE, as well as negative Eu anomalies, which are consistent with the W-related highly evolved granitoids but distinct to W-barren granitoids. Hence, this study highlights W mineralization potential in the Qinling belt associated with the highly evolved Late Triassic granitoids.

引用

页数：16

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