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Zircon and apatite fission track analyses on mineralization ages and tectonic activities of Tuwu-Yandong porphyry copper deposit in northern Xinjiang, China
作者单位:YUAN WanMing(State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China) ; BAO ZengKuan(Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China) ; DONG JinQuan(Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China) ; GUO ZhaoJie(Department of Geology, Peking University, Beijing 100871, China) ; DENG Jun(State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China) ;
基金项目:国家重点基础研究发展计划(973计划);国家自然科学基金
摘    要:The mineralization ages reported in the past in the Tuwu-Yandong copper district not only are different,but also fall into the Hercynian epoch.This study has achieved 9 zircon and 7 apatite fission track analysis results.The zircon fission track ages range from 158 Ma to 289 Ma and the apatite ages are between 64 Ma and 140 Ma.The mineralization accords with the regional tectonics in the copper district.We consider that the zircon fission track age could reveal the mineralization age based on annealing zone temperature of 140―300℃ and retention temperature of ~250℃ for zircon fission track,and metallogenetic temperature of 120―350℃ in this ore district.Total three mineralization epochs have been identified,i.e.,289―276 Ma,232―200 Ma and 165―158 Ma,and indicate occurrence of the min-eralization in the Indosinian and Yanshan epochs.Corresponding to apatite fission track ages,the three tectonic-mineralizing epochs are 140―132 Ma,109―97 Ma and 64 Ma,which means age at about 100℃ after the mineralization.The three epochs lasted 146 Ma,108 Ma and about 100 Ma from ~250℃ to ~100℃ and trend decrease from early to late.It is shown by the fission track modeling that this district underwent three stages of geological thermal histories,stable in Cretaceous and cooling both before Cretaceous and after 20 Ma.

收稿时间:8 May 2007
修稿时间:6 July 2007

Zircon and apatite fission track analyses on mineralization ages and tectonic activities of Tuwu-Yandong porphyry copper deposit in northern Xinjiang,China
Authors:Yuan WanMing  Bao ZengKuan  Dong JinQuan  Guo ZhaoJie  Deng Jun
Institution:1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China
2. Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China
3. Department of Geology, Peking University, Beijing 100871, China
Abstract:The mineralization ages reported in the past in the Tuwu-Yandong copper district not only are different, but also fall into the Hercynian epoch. This study has achieved 9 zircon and 7 apatite fission track analysis results. The zircon fission track ages range from 158 Ma to 289 Ma and the apatite ages are between 64 Ma and 140 Ma. The mineralization accords with the regional tectonics in the copper district. We consider that the zircon fission track age could reveal the mineralization age based on annealing zone temperature of 140–300°C and retention temperature of ∼250°C for zircon fission track, and metallogenetic temperature of 120–350°C in this ore district. Total three mineralization epochs have been identified, i.e., 289–276 Ma, 232–200 Ma and 165–158 Ma, and indicate occurrence of the mineralization in the Indosinian and Yanshan epochs. Corresponding to apatite fission track ages, the three tectonic-mineralizing epochs are 140–132 Ma, 109–97 Ma and 64 Ma, which means age at about 100°C after the mineralization. The three epochs lasted 146 Ma, 108 Ma and about 100 Ma from ∼250°C to ∼100°C and trend decrease from early to late. It is shown by the fission track modeling that this district underwent three stages of geological thermal histories, stable in Cretaceous and cooling both before Cretaceous and after 20 Ma. Supported by the National Basic Research Priorities Program (Grant No. 2001CB409804) and the National Natural Science Foundation of China (Grant Nos. 10475093, 10175076 and 40072068)
Keywords:mineralization age  tectonic epoch  fission track  zircon  apatite  Tuwu-Yandong  Xinjiang
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