中缅毗邻区金腊Pb-Zn-Ag多金属矿田元素、稳定同位素和流体包裹体地球化学

陈永清; 黄静宁; 卢映祥; 夏庆霖; 孙明祥; 李建荣

Volume 34 Issue 4

Jul. 2009

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Article Navigation > Earth Science > 2009 > 34(4): 585-594

CHEN Yong-qing, HUANG Jing-ning, LU Ying-xiang, XIA Qing-lin, SUN Ming-xiang, LI Jian-rong, 2009. Geochemistry of Elements, Sulphur-Lead Isotopes and Fluid Inclusions from Jinla Pb-Zn-Ag Poly-Metallic Ore Field at the Joint Area across China and Myanmar Border. Earth Science, 34(4): 585-594.

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Geochemistry of Elements, Sulphur-Lead Isotopes and Fluid Inclusions from Jinla Pb-Zn-Ag Poly-Metallic Ore Field at the Joint Area across China and Myanmar Border

1.
Faculty of Earth Sciences & Mineral Resources, China University of Geasciences, Beijing 100083, China
2.
Yunnan Geological Survey, Kunming 650051, China
3.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2008-07-28
Publish Date: 2009-07-25

Abstract

Abstract

Jinla Pb-Zn-Ag poly-metallic ore field across China and Myanmar, located at the south segment of the Mengtong-Gengma-Ximeng passive continental margin of Proterozoic era-Palaeozoic era, the eastern margin of the Baoshan-Shantai Massif, includes the Nanla and the Jinchang Pb-Zn-Ag deposits.According to the studies on both the element geochemistry of the host rocks, the granites, and the ore deposits and the sulphur-lead isotopes as well as fluid inclusion from the ore deposits in Jinchang Pb-Zn-Ag deposits.The conclusions are drawn as follows. (1) The granites in this ore field are richer in Pb, Zn, Cu, Au, Sn, and W than in other granites, and the K-feldspar granite porphyry has a closer relationship with the mineralization. (2) The Pb isotope ratios (²⁰⁶Pb/²⁰⁴Pb, ²⁰⁷Pb/²⁰⁴Pb, ²⁰⁸Pb/²⁰⁴Pb) from the massive skarn Pb-Zn-Cu ores are lower than those from the brecciated Pb-Zn-Ag ores with quartzification and the stratiform Pb-Zn-Ag ores with chalcedonization, which may indicate that the former contains radioactive Pb less than the latter. (3) The Pb-Zn-Ag mineralizations may be divided into two ore-forming epochs: the skarn ore-forming epoch and the hydrotherma ore-forming epoch; the former is associated with Pb-Zn-Cu mineralization, the latter with Pb-Zn-Ag mineralization.The hydrothermal ore-forming epoch may be subdivided into two hydrothermal ore-forming stages: the mesothermal ore-forming stage (200-290 ℃) at which the brecciated ores were deposited, and the epithermal ore-forming stage (140-200 ℃) at which the stratiform ores were formed. (4) The Jinla Pb-Zn-Ag deposits not only have the same features of Pb isotope ratios as some Pb-Zn deposits formed at the Baoshan-Zhengkang terrain and as some Pb-Zn deposits formed at the Changning-Menglian volcanic belt but also these Pb-Zn deposits are associated with the granites emplaced at Himalayan orogenic episode, which may indicate that although forming different geological tectonic terrains, these Pb-Zn deposits have intrinsic connection with the Himalayan technomagmaism.
- Pb-Zn-Ag polymetallic mineralization,
- geochemistry,
- S-Pb isotopes,
- fluid inclusion,
- the joint area across China and Myanmar border.

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References(30)

References

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Geochemistry of Elements, Sulphur-Lead Isotopes and Fluid Inclusions from Jinla Pb-Zn-Ag Poly-Metallic Ore Field at the Joint Area across China and Myanmar Border

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