Dating Magmatic Hornblende and Biotite and Hydrothermal Sericite by Laser Probe Technique: Constraints on Genesis of Wangershan Gold Deposit, Eastern Shandong Province, China

Jianwei Li; P M Vasconcelos; M F Zhou; N S Duzgoren-Aydin

Dec 2003

Article Contents

Journal of Earth Science > 2003 > 14(4): 339-348.

Jianwei Li, P M Vasconcelos, M F Zhou, N S Duzgoren-Aydin. Dating Magmatic Hornblende and Biotite and Hydrothermal Sericite by Laser Probe Technique: Constraints on Genesis of Wangershan Gold Deposit, Eastern Shandong Province, China. Journal of Earth Science, 2003, 14(4): 339-348.

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Dating Magmatic Hornblende and Biotite and Hydrothermal Sericite by Laser Probe Technique: Constraints on Genesis of Wangershan Gold Deposit, Eastern Shandong Province, China

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074
2.
Department of Earth Sciences, The University of Queensland, Brisbane 4072, Australia
3.
Department of Earth Sciences, The University of Hong Kong, Pokfulam, Hong Kong

Funds:

CUG Research Startup Funding for Returnee Studying Abroad 2002-13

the National Key Basic Research Project G1999043207-3

ARC Large Grant A39531815

Received Date: 17 May 2003
Accepted Date: 08 Sep 2003

Abstract

Abstract

The Wangershan gold deposit and spatially related Shangzhuang granite, eastern Shandong Province, have been precisely dated by ⁴⁰Ar/³⁹Ar laser incremental heating technique. Magmatic hornblende and biotite, collected from the Shangzhuang granites, yielded well-defined and reproducible plateau ages at 128.1-127.5 and 124.4-124.1 Ma (2σ), measuring the cooling ages of the intrusion at ca. 500 ℃ and 300-350 ℃, respectively. Hydrothermal sericite extracted from auriferous vein gave high-quality plateau ages between (120.6±0.3) Ma and (120.0±0.4) Ma (2σ). Given the similarity of the closure temperature for argon diffusion (300-350 ℃) in the sericite mineral to the homogenization temperature of primary fluid inclusions in the quartz from gold ores, and the intergrowth of sericite with native gold, present ⁴⁰Ar/³⁹Ar sericite ages can be reliably interpreted in terms of the mineralization age for the Wangershan deposit. ⁴⁰Ar/³⁹Ar hornblende and biotite ages permit an estimate for the cooling rate of the Shangzhuang granite at about 50 ℃/Ma. There are abundant intermediate-mafic dikes in most gold camps of eastern Shandong, whose ages of formation have been previously constrained mainly at 121-119 Ma. The temporal association between the Shangzhuang granite, the Wangershan gold deposit, and the widespread dikes confirms that intrusive activity, gold mineralization, and dike emplacement in this region were broadly coeval, reflecting significant continental lithosphere thinning and resulting crustal extension of Early Cretaceous in eastern China.
- ⁴⁰Ar／³⁹Ar dating,
- cooling age,
- magmatism mineralization,
- Wangershan gold deposit

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References(24)

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