Re-Os Isotope Dating of Molybdenite from the Shapoling Mo Deposit, East Qinling and Its Implication for Identification of Late Jurassic Mo Mineralization

Su-wei YUE; Xiao-hua DENG; Jun-ming YAO; Ya-li SUN

doi:10.15898/j.cnki.11-2131/td.201704060052

Rock and Mineral Analysis > 2017 > 36(3): 305-317. > DOI: 10.15898/j.cnki.11-2131/td.201704060052

Su-wei YUE, Xiao-hua DENG, Jun-ming YAO, Ya-li SUN. Re-Os Isotope Dating of Molybdenite from the Shapoling Mo Deposit, East Qinling and Its Implication for Identification of Late Jurassic Mo Mineralization[J]. Rock and Mineral Analysis, 2017, 36(3): 305-317. DOI: 10.15898/j.cnki.11-2131/td.201704060052

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Re-Os Isotope Dating of Molybdenite from the Shapoling Mo Deposit, East Qinling and Its Implication for Identification of Late Jurassic Mo Mineralization

1.
School of Jewlry, Guangzhou College, South China University of Technology, Guangzhou 510800, China
2.
Beijing Institute of Geology for Mineral Resources, Beijing 100012, China
3.
Guangzhou Insititute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

More Information

Received Date: April 05, 2017
Revised Date: May 19, 2017
Accepted Date: June 01, 2017
Published Date: May 31, 2017

Abstract

Highlights
· The age of the Shapoling Mo deposit was determined by Re-Os isotopic dating of molybdenite.

· Molybdenite samples collected from the Taihua Supergroup and adamellite yield Re-Os age of 160 Ma and 130 Ma, respectively.

· The Shapoling deposit contain the late Jurassic and the early Cretaceous Mo mineralization.

ABSTRACT

The Shapoling Mo deposit is located in the Xiong'er rock mass of the southern margin of the North China Craton. The deposit is hosted in a contact zone between granite and wallrocks of the Taihua Soupergroup, which is a recently found discovered vein dissemination type deposit in East Qinling. The ore-bodies are associated with quartz veins and controlled by subsidiary faults. The mineralization styles include veinlet and disseminated types. In order to determine the age of the Shapoling Mo deposit, Re-Os isotopic dating of molybdenite was conducted. Six molybdenite samples yielded Re-Os ages ranging from 158.3±1.5 Ma to 160.7±1.2 Ma, with a weighted mean age of 160±1 Ma (2σ, MSWD=2.1). The Re-Os age shows that the Mo mineralization occurred during the late Jurassic, earlier than the formation of Huashan rock mass (about 30 Ma). In addition, one molybdenite sample in Huashan rock mass yielded a Re-Os age of 130.5±1.0 Ma, which is in accordance with the age of the Huashan pluton and molybdenite age (125.4-129.4 Ma) reported by a previous study. In conclusion, the Shapoling deposit contains two episodes of Mo mineralization from the early Cretaceous and late Jurassic periods. Combining this with geological characteristics and tectonic-metallogenic evolution, it is suggested that Huashan rock mass, granite porphyry, and related hydrothermal deposits in the Xiong'er terrain are the products of extrusion to extension transition during continent-continent collision in the Qinling orogenic belt.
- molybdenite,
- Re-Os isotopic dating,
- Shapoling Mo deposit,
- East Qinling Orogenic belt

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References (72)

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Re-Os Isotope Dating of Molybdenite from the Shapoling Mo Deposit, East Qinling and Its Implication for Identification of Late Jurassic Mo Mineralization

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