Helium and argon isotope geochemistry of alkaline intrusion-associated gold and copper deposits along the Red River–Jinshajiang fault belt, SW China
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- 作者：Hu ; Rui-Zhong ; Burnard ; P.G. ; Bi ; Xian-Wu ; Zhou ; Mei-Fu ; Pen ; Jian-Tang ; Su ; Wen-Chao ; Wu ; Kai-Xing
- 关键词：Red River&ndash ; Jinshajiang ; Alkaline intrusion ; Copper and gold deposits ; Helium and argon isotopes ; Ore-forming fluid ; Mantle fluids ; ASW
- 刊名：Chemical Geology
- 出版年：2004
- 出版时间：February 16, 2004
- 年：2004
- 卷：203
- 期：3-4
- 页码：305-317
- 全文大小：399 K
文摘
The Red River–Jinshajiang strike-slip fault zone on the eastern margin of the Tibetan plateau was originally produced by the India–Eurasia collision 
60–70 Myr ago. Numerous post-collisional, mantle-derived alkaline igneous rocks, with ages of 40–30 Ma, have been intruded along this fault zone. In recent years, several copper and gold deposits associated with the alkaline intrusions of this region were discovered, such as the Yao'an and Beiya gold deposits and the Yulong and Machangqing copper deposits studied in this paper. The mineralised intrusions are felsic, with SiO2 ranging from 61.4 to 67.7 wt. % , K2O+Na2O from 8.1 to 11.5 wt. % and K2O/Na2O>1. The deposits are located at both the exo- and endo-contact zones of the intrusions. The mineral deposits are of hydrothermal origin, with the ore-forming temperatures mainly in the range 150–450 °C.
60–70 Myr ago. Numerous post-collisional, mantle-derived alkaline igneous rocks, with ages of 40–30 Ma, have been intruded along this fault zone. In recent years, several copper and gold deposits associated with the alkaline intrusions of this region were discovered, such as the Yao'an and Beiya gold deposits and the Yulong and Machangqing copper deposits studied in this paper. The mineralised intrusions are felsic, with SiO2 ranging from 61.4 to 67.7 wt. % , K2O+Na2O from 8.1 to 11.5 wt. % and K2O/Na2O>1. The deposits are located at both the exo- and endo-contact zones of the intrusions. The mineral deposits are of hydrothermal origin, with the ore-forming temperatures mainly in the range 150–450 °C.