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《Geochimica》 2001-03
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Trace element and isotope evidence for the evolution of ore-forming fluid of Yao'an gold deposit, Yunnan Province, China

BI Xian wu1, HU Rui zhong1, D.H. Cornell2(1. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China; 2. Department of Geology, Gotenburg University, P.O.Box 460, SE 405 30 Gotenburg, Sweden)  
Trace element, sulfur and carbon isotope geochemistry was applied to the formation and evolution of ore forming fluids in the Yaoan gold deposit of Yunnan Province, China. The results show that magmatic fluids generated during the petrogenesis of the alkali rich intrusives caused both potassic alteration and early stage Ⅰ sulfide mineralization of the Yaoan gold deposit. The later stage Ⅱ fluids had very different REE character, with much lower levels and flatter chondrite normalized patterns, combining with quartz, calcite and chlorite as the main gangue minerals in this stage, reflecting a lower temperature environment. From stageⅠ to stage Ⅱ (sulfide plus oxide), the fluids evolved from the system dominated by magmatic fluids to that by meteoric fluids. This ore forming fluid evolution is analogous to that found in the petrogenesis of calc alkaline intrusive rocks. This type of gold mineralization associated with alkali rich intrusives is probably more widespread than presently realized.
【Fund】: 国家杰出青年基金(49925309);; 国家重点基础研究发展规划项目(G1999043209)
【CateGory Index】: P618.51
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