| PETROGENETIC AND METALLOGENETIC AGES FOR THE PORPHYRY COPPER DEPOSITS IN THE GANGDISE METALLOGENIC BELT IN SOUTHERN TIBET |
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| 作者姓名： | LI Guangming* and RUI Zongyao |
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| 作者单位： | 1. Chengdu Institute of Geology and Mineral Resources，Chengdu，SC 610082，China; 2. Institute of Mineral Resources，Chinese Academy of Geological Sciences，Beijing 100037，China |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划)，large-scale Geological Survey Program of China Geological Survey |
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| 摘 要： | In the Gangdise area in the south of Qinghai-Tibet Plateau, a set of calc-alkalinevolcanics-granitic intrusives, which were resulted from subduction of neo-Tethys Ocean at YurlungZangbo oceanic plate beneath Lahsa block in Cretaceous-Palaeogene and subsequentarc-continental collision, were exposed, together with a set of shoshonitic volcanics and hypabyssalporphyries developed in the later stage (Bureau of Geology and Mineral Resources of TibetAutonomous Region, 1993; Li, 2002; Zhao et …
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PETROGENETIC AND METALLOGENETIC AGES FOR THE PORPHYRY COPPER DEPOSITS IN THE GANGDISE METALLOGENIC BELT IN SOUTHERN TIBET |
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| LI Guangming* and RUI Zongyao.PETROGENETIC AND METALLOGENETIC AGES FOR THE PORPHYRY COPPER DEPOSITS IN THE GANGDISE METALLOGENIC BELT IN SOUTHERN TIBET[J].Geotectonicaet Metallogenia,2004,28(2):118-127. |
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| Authors: | LI Guangming RUI Zongyao |
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| Institution: | 1. Chengdu Institute of Geology and Mineral Resources, Chengdu, SC 610082,China
2. Institute of Mineral Resources,Chinese Academy of Geological Sciences, Beijing,100037,China |
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| Abstract: | Recent examination and assessment about the porphyry copper deposits in Gangdise metallogenic belt in southern Tibet have revealed that these porphyry copper deposits are highly prospective. Several methods have been used for the isotopic dating of the Qulong, Tinggong and Chongjiang porphyry copper deposits, which gives out a petrogenetic age of 17.58±0.74Ma (single-zircon dating of SHRIMP), a metallogenetic age of 15.99±0.32Ma (Re-Os isochron dating) and an alteration age ranging between12.00Ma and 16.5Ma (K-Ar dating). The metallogenetic age is in general agreement with the alteration age.It can be seen that the petrogenetic and metallogenetic ages for the porphyry copper deposits in Gangdise metallogenic belt are noticeably later than the age for the collisional granitic intrusion in this belt. The authors contend that the porphyry copper deposits in the study area were formed in a post-collisional extensional tectonic setting, and are closely related to the delamination of the mountain roots of the orogenic belts and the uplifting of the Qinghai-Tibet Plateau. |
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| Keywords: | Tibet Gangdise metallogenic belt porphyry copper deposit isotopic dating significance |
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