Superimposed Orogenesis and Metallogenesis: Taking Orogenic Gold Deposits in Ailaoshan Gold Belt, Southwest China as an Example
详细信息
- 责任者：Yang Liqiang (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Liu Jiangtao
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(6)
- 关键词：金矿 ; gold ores ; 哀牢山 ; Ailao Mountains
- 页码：p.1723-1739
- 图表：10 illus., 2 tables, 92 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The relationship between the processes of superimposed orogenesis and gold mineralization has been discussed in terms of the studies of tectonic setting, evolution of ore-controlling structures, timing and sequence of gold mineralization. The results show that there were three tectonic-thermal events related to gold mineralization. The early gold mineralization, occurred from 61.55 Ma to 63.09 Ma, corresponds the peak period of the thrust system and generation of strike-slip fault, indicates they were mainly controlled by the strongly early convergence geodynamic regime of India-Euraisa conllision. The main gold mineralization, occurred from 33.76 Ma to 36.10 Ma, which related to the relaxation of regional compressive stress field and corresponding to the generation of alkali-rich porphyry and booming of strike-slip faults, reveals that they were mainly controlled by the transition of geodynamic regime of India-Euraisa collision, and eastward escapation of the Tibetan Plateau, and pulsating uplift of asthenosphere. The late gold mineralization, occurred from 26.40 Ma to 30.80 Ma, corresponds the extension of lithosphere and the intrusion of high-K plutons which came from the depleted mantle and formed during the decompression period in internal plate, were mainly controlled by the oblique reverse rotation and rollback subduction of India Plate.