Molybdenite Re-Os dating and its tectonic significance of the Guilingou porphyry molybdenum deposit, southern Qinling | Health & Environmental Research Online (HERO)

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HERO ID

4840509

Reference Type

Journal Article

Title

Molybdenite Re-Os dating and its tectonic significance of the Guilingou porphyry molybdenum deposit, southern Qinling

Author(s)

Zhang Hong; Chen DanLing; Zhai MingGuo; Zhang FuXin; Gong XiangKuan; Sun WeiDong

Year

2015

Volume

Issue

Page Numbers

2023-2037

Web of Science Id

WOS:000358550700017

Abstract

The Guilingou porphyry molybdenum deposit in Zhen ' an City, Shaanxi Province is located in the southern Qinling polymetallic belts. The wall rocks of the deposit mainly consist of fine-grained granite, K-feldspar granite and altered coarse-grained granite. Molybdenite Re-Os isotopic dating of the ore deposit and zircon U-Pb dating of wall rock were conducted to constrain the relationship between magmatic evolution and mineralization as well as their tectonic significances. The results showed that six molybdenite Re-Os model ages range from 195. 9Ma to 198. 5Ma, with a weighted average age of 197. 2 +/- 1. 3Ma, indicating that the Guilingou porphyry Mo deposit was formed in the Early Jurassic. Meanwhile, zircon U-Pb dating of fine-grained granite, K-feldspar granite and altered coarse-granite yielded ages of 199 +/- 1. 4Ma, 201 +/- 3. 1Ma and 198 +/- 11Ma, respectively. This suggests that granitic magmatism was almost simultaneous with the mineralization of the Guilingou porphyry molybdenum deposit. Remarkably, the metallogenic age of 200 similar to 190Ma for the Guilingou Mo deposit is different from the reported three main mineralization stages of Qinling molybdenum deposits in literatures, namely 238 similar to 213Ma, 145 similar to 126Ma and 116 similar to 110Ma, with being slightly later than the first mineralization stage, displaying an unknown important metallogenic event in the Qinling polymetallic belts. This finding will be of importance in guiding the ore exploration in the southern Qinling. Our results also suggest the Guilingou porphyry molybdenum deposit was probably formed during the magmatic-hydrothermal process induced by orogenic collapse following the Indosinian collision between the South China Block and the North China Block.

Keywords

Guilingou Mo deposit; Molybdenum Re-Os isochron age; Zircon U-Pb dating; Mineralization stage; South Qinling