کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4697895 | 1637269 | 2007 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Geochemistry and geochronology of native copper mineralization related to the Emeishan flood basalts, Yunnan Province, China
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی اقتصادی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Geochemistry and geochronology of native copper mineralization related to the Emeishan flood basalts, Yunnan Province, China Geochemistry and geochronology of native copper mineralization related to the Emeishan flood basalts, Yunnan Province, China](/preview/png/4697895.png)
چکیده انگلیسی
Native copper mineralization in northeastern Yunnan is related to the Emeishan flood basalts, which have high Cu background concentrations. The deposits are located in the Ludian, Maoling and Yiche synclines between the flood basalts and the overlying Xuanwei Formation. Evidence from REE and HSFE concentrations, oxygen isotope compositions, bitumen reflectance, and mineral paragenesis indicates that the high-grade copper orebodies were deposited from moderate to low temperature hydrothermal solutions (420 to 100 °C) in a reducing environment. 40Ar/39Ar spectra for the laumontites that coexist with native copper in the high-grade ores yield consistent plateau and isochron ages (226 to 228 Ma). These are interpreted to represent the age of the first stage of hydrothermal mineralization, which took place at temperatures of 200 to350 °C, concordant with that of Zn-Pb-Ag-Ge mineralization also occurring in the area. The heulandites yield a stable 40Ar/39Ar plateau age of 134.0 ± 1.7 Ma, consistent with isochron ages indicated by U-Th-Pb isotopic systematics, indicating a second stage of native copper mineralization at lower temperatures (100 to 200 °C) that took place during the Early Cretaceous.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ore Geology Reviews - Volume 32, Issues 1â2, September 2007, Pages 366-380
Journal: Ore Geology Reviews - Volume 32, Issues 1â2, September 2007, Pages 366-380
نویسندگان
Zhu Bing-Quan, Hu Yao-Guo, Zhang Zheng-Wei, Cui Xue-Jun, Dai Tong-Mo, Chen Guang-Hao, Peng Jian-Hua, Sun Yong-Ge, Liu De-Han, Chang Xiang-Yang,