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Chen X.-N.,China University of Geosciences | Yuan W.-M.,China University of Geosciences | Zhang A.-K.,No3 Exploration Institute Of Geology And Mineral Resources Of Qinghai Province | Duan H.-W.,China University of Geosciences | And 2 more authors.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2014

By now fewer research works have been done in Qimantage area, western section of Eastern Kunlun Mountains. A little published dating data fell into Indosinian period. A series of zircon fission track ages from granitoid samples were achieved and multiphase tectonic-magmatic activities were revealed in this paper. The zircon fission track age range from 201 Ma to 109 Ma might be divided into four groups, i.e. 201 Ma, 185 Ma, 164-163 Ma and 139-109 Ma. These ages indicate two compressional and two stretching tectonic activities. The 201 Ma and 139-109 Ma ages present northward subductions of Qiangtang Terrane and Gangdise Terrane in Middle-Later Triassic and Late Jurassic respectively, resulting in collision-convergences with north-side terranes. The ages of 185 Ma and 164-163 Ma reflect post-orogenic stretching events in Early Jurassic and Late Jurassic, respectively.

Tian C.,Geological Survey of Qinghai Province | Yuan W.,China University of Geosciences | Zeng X.,Geological Survey of Qinghai Province | Zhang A.,China University of Geosciences | And 6 more authors.
He Jishu/Nuclear Techniques | Year: 2015

Background: Hariza polymetallic ore district is located in eastern section of East Kunlun Mountains, Qinghai Province and belongs to multicycle magmatic arc belt in Middle of East Kunlun. A total of seven large scale mineralizing zones have been discriminated and mainly fall into tectonic alterated rock type. The IV metallogenic zone is composed of two branches, NE-and NW-trending, of zones. The mineralization was close related to magmatic activities and was controlled by both NE-and NW-trending fault zones. Purpose: This paper applies the zircon fission track nuclear technique to probe the mineralizing ages and epochs for IV metallogenic zone in Hariza polymetallic ore district. Methods: The conservation temperature of zircon fission track is about 250℃ that coincides with the metallogenic temperature in this district and so the zircon fission track dating technique could reveal the mineralization age and epoch. Results: The six zircon fission track results are achieved, ranging from 120 Ma to 204 Ma, which could be divided into three groups of 204 Ma, 153-168 Ma and 120 Ma. Conclusion: The three groups of ages reveal three periods of mineralization that correspond with three tectonic activities. The mineralizing time in the SE-trending branch belt was earlier than that in the SW-trending branch. ©, 2015, Science Press. All right reserved.

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