Re-Os Molybdenite Ages of the Shenduolong Skarn Mo-Pb-Zn Deposit and Geodynamic Framework, Qinghai Province

Wen-liang LI; Rui XIA; Min QING; Chao LI; Dong ZHANG; Hao SUN; Ying-chuan LU; Peng LIU; Ao-bo ZHOU

Rock and Mineral Analysis > 2014 > 33(6): 900-907.

Wen-liang LI, Rui XIA, Min QING, Chao LI, Dong ZHANG, Hao SUN, Ying-chuan LU, Peng LIU, Ao-bo ZHOU. Re-Os Molybdenite Ages of the Shenduolong Skarn Mo-Pb-Zn Deposit and Geodynamic Framework, Qinghai Province[J]. Rock and Mineral Analysis, 2014, 33(6): 900-907.

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Re-Os Molybdenite Ages of the Shenduolong Skarn Mo-Pb-Zn Deposit and Geodynamic Framework, Qinghai Province

1.
Institute of Gold Geology, Chinese Armed Police Force, Langfang 065000, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Beijing), Beijing 100083, China
3.
National Research Center for Geoanalysis, Beijing 100037, China

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Received Date: May 04, 2014
Revised Date: November 05, 2014
Accepted Date: November 14, 2014
Published Date: June 24, 2014

Abstract

ABSTRACT

The Shiduolong skarn Mo-Pb-Zn deposit is located in the multi-metal metallogenic belt of E'lashan. The precise age of the ore deposit limits our understanding of the ore-forming processes and geodynamical setting. In spite of the K-Ar methods of analysis and testing in the Shiduolong mining area and the periphery of intrusives (188-208 Ma and 368 Ma), whether or not thest ages can represent real mineralization times requires to be tested further. In this study, we carried out a Re-Os study of molybdenite from the Shuangqing deposit, providing fundamental data to build the mineral deposit model and reflect the geodynamical setting in this area. 6 molybdenite samples of the deposit yield Re-Os isotopic model ages ranging from 234.2 Ma to 240.1 Ma, with a weighted mean age of (236.1±2.1) Ma. A similar isochron age of (233.4±9.6) Ma is also obtained by the isochron regression. This result suggests that the Mo mineralization occurred in last Triassic. The Re contents of molybdenite indicate that ore-forming materials are derived from crust and aqueous fluids involved in the ore-forming stage. Based on the same of rock-forming in E'lashan and mineralization in Shiduolong Mo-Pb-Zn deposit, rock-forming and ore-forming were regarded as the same geodynamic background of India-Eurasia collision. The tectonic regime changing from developing oceanic rift to collision-extension make the thickened lower crust melt partially in the Indosinian magmatic-tectonic-metallogenic event.
- molybdenite,
- Re-Os aging,
- skarn deposit,
- rock-forming time,
- geodynamic framework,
- Shiduolong in Qinghai Province

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Re-Os Molybdenite Ages of the Shenduolong Skarn Mo-Pb-Zn Deposit and Geodynamic Framework, Qinghai Province

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