SEDEX DEPOSIT GENESIS OF THE Pb-Zn DEPOSITS IN THE NORTHEASTERN MARGIN OF LANPING BASIN IN YUNAN: EVIDENCE FROM MINERALOGICAL AND SULFUR ISOTOPIC STUDIES

HUANG Yu-feng; CAO Dian-hua; WANG Zhi-jun; LI Yi-ke; WANG An-jian

Volume 17 Issue 1

Mar. 2011

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Article Navigation > Journal of Geomechanics > 2011 > 17(1): 91-102

HUANG Yu-feng, CAO Dian-hua, WANG Zhi-jun, et al., 2011. SEDEX DEPOSIT GENESIS OF THE Pb-Zn DEPOSITS IN THE NORTHEASTERN MARGIN OF LANPING BASIN IN YUNAN: EVIDENCE FROM MINERALOGICAL AND SULFUR ISOTOPIC STUDIES. Journal of Geomechanics, 17 (1): 91-102.

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SEDEX DEPOSIT GENESIS OF THE Pb-Zn DEPOSITS IN THE NORTHEASTERN MARGIN OF LANPING BASIN IN YUNAN: EVIDENCE FROM MINERALOGICAL AND SULFUR ISOTOPIC STUDIES

1.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
Hanwang Aoniu Mining Corporation Ltd., Fushun 113001, Chin

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Received: 2010-10-26
Published: 2011-03-01

Abstract

Abstract

A series of lead-zinc deposits such as Qingdianwan, Caizidi, Jinshantao and so on, which are situated in the Upper Triassic Shizhongshan Formation (T₃s) at the Weixi-Qiaohou fault belt, northeast of Lanping Basin. The genesis studies of these lead-zinc deposits are relatively superficial.. In this paper, through detailed field geological survey and studies under the microscope, authors found a large number of typical signs of the synsedimentary deposit such as laminated structure, striped band structure, vein net structure, the soft sedimentary pyrite band structure, strawberry-like pyrite structure, colloidal structure of pyrite, sphalerite concentric structure etc. Sulfur isotopes analysis results of metal sulfide in Qingdianwan deposit are following: δ³⁴ S of pyrite at 3.7‰ ~ 8.1‰, average 5.34‰ (N = 5); δ³⁴ S of sphalerite at 5.2‰ ~ 10‰, average 7.18‰ (N = 5); δ³⁴ S of galena at 5.2‰ ~ 9.9‰, average 7.275‰ (N = 4). It demonstrates that S in the deposit come from deoxidize of sulfate radical in seawater. Combining to the age data of these deposits and the tectonic background, we think these deposits in this area are pertain to Sedimentary Exhalation (SEDEX) genesis which revised the previous viewpoint that these deposits simply controlled by structure.
- Lanping Basin,
- Sedimentary Exhalative deposit (SEDEX),
- synsedimentary,
- mineralogy,
- sulfur isotope

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References(23)

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