Geology, Geochronology, and Hf Isotopic Composition of the Pha Lek Fe Deposit, Northern Laos: Implications for Early Permian Subduction-Related Skarn Fe Mineralization in the Truong Son Belt

Lin Hou; Shusheng Liu; Linnan Guo; Fuhao Xiong; Chao Li; Meifeng Shi; Qiming Zhang; Siwei Xu; Songyang Wu

doi:10.1007/s12583-018-0864-7

Volume 30 Issue 1

Jan 2019

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Journal of Earth Science > 2019 > 30(1): 109-120.

Lin Hou, Shusheng Liu, Linnan Guo, Fuhao Xiong, Chao Li, Meifeng Shi, Qiming Zhang, Siwei Xu, Songyang Wu. Geology, Geochronology, and Hf Isotopic Composition of the Pha Lek Fe Deposit, Northern Laos: Implications for Early Permian Subduction-Related Skarn Fe Mineralization in the Truong Son Belt. Journal of Earth Science, 2019, 30(1): 109-120. doi: 10.1007/s12583-018-0864-7

Citation:

Lin Hou, Shusheng Liu, Linnan Guo, Fuhao Xiong, Chao Li, Meifeng Shi, Qiming Zhang, Siwei Xu, Songyang Wu. Geology, Geochronology, and Hf Isotopic Composition of the Pha Lek Fe Deposit, Northern Laos: Implications for Early Permian Subduction-Related Skarn Fe Mineralization in the Truong Son Belt. Journal of Earth Science, 2019, 30(1): 109-120. doi: 10.1007/s12583-018-0864-7

Citation:

Lin Hou, Shusheng Liu, Linnan Guo, Fuhao Xiong, Chao Li, Meifeng Shi, Qiming Zhang, Siwei Xu, Songyang Wu. Geology, Geochronology, and Hf Isotopic Composition of the Pha Lek Fe Deposit, Northern Laos: Implications for Early Permian Subduction-Related Skarn Fe Mineralization in the Truong Son Belt. Journal of Earth Science, 2019, 30(1): 109-120. doi: 10.1007/s12583-018-0864-7

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Geology, Geochronology, and Hf Isotopic Composition of the Pha Lek Fe Deposit, Northern Laos: Implications for Early Permian Subduction-Related Skarn Fe Mineralization in the Truong Son Belt

doi: 10.1007/s12583-018-0864-7

1.
Chengdu Center, China Geological Survey, Chengdu 610081, China
2.
Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation of Ministry of Land and Resources, Chengdu University of Technology, Chengdu 610059, China
3.
National Research Center of Geoanalysis, Chinese Academy of Geological Science, Beijing 100037, China
4.
China University of Geosciences, Beijing 100083, China

More Information

Corresponding author: Shusheng Liu
Received Date: 23 Jul 2018
Accepted Date: 21 Oct 2018
Publish Date: 01 Feb 2019

Abstract

Abstract

The Truong Son metallogenic belt in central Laos and Vietnam is an important Fe-Cu-Sn-Au polymetallic ore district. The Pha Lek Fe deposit is closely related to Late Carboniferous-Early Permian Ⅰ-type granitic magmatism, and contains >50 Mt@45% to 50% of Fe ore. Ore minerals occur mainly as magnetite and hematite in the skarn alteration zone between a granitic pluton and metamorphosed Middle-Upper Devonian carbonates. The granitic pluton comprises granodiorite and granite, with zircon U-Pb dating indicating synchronous emplacement at 288.2±1.3 and 284.9±1.2 Ma, respectively. Zircons from these granitoids have ε_Hf(t) values of 2.9-11.2 and relatively young T_DM2 ages (< 1.0 Ga), indicating an origin by partial melting of depleted mafic crust or magma mixing. Previous studies have shown that these granitoids have high Y, Yb, and K₂O contents, and low Sr and Na₂O contents, which are interpreted as the melting of mafic continental crust. Pyrite of the main mineralization stage yields an ¹⁸⁷Re/¹⁸⁸Os-¹⁸⁷Os/¹⁸⁸Os isochron age of 287±17 Ma, indicating that mineralization is associated with Pha Lek granitic magmatism. A Late Carboniferous-Early Permian subduction-related skarn-type Fe mineralization model is proposed for the Pha Lek deposit. More evidence is needed to verify a hypothesis of volcanic overprinting during Late Triassic post-collisional extension.
- Truong Son belt,
- Pha Lek Fe deposit,
- granitic intrusions,
- geochronology,
- Hf isotopic composition

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References(44)

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