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The origin of the world class tin-polymetallic deposits in the Gejiu district, SW China: Constraints from metal zoning characteristics and 40Ar39Ar geochronology

Citation

Cheng, Y and Mao, J and Chang, Z and Pirajno, F, The origin of the world class tin-polymetallic deposits in the Gejiu district, SW China: Constraints from metal zoning characteristics and 40Ar-39Ar geochronology, Ore Geology Reviews, 53 pp. 50-62. ISSN 0169-1368 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier

DOI: doi:10.1016/j.oregeorev.2012.12.008

Abstract

The Gejiu tin-polymetallic deposits in the Western Cathaysia Block of South China comprise the world's largest primary tin district, with a total resource of approximately 300 million metric ton ores, at an average grade of 1 wt percent Sn. Tin polymetallic mineralization occurs in five deposits and has four ore types, i.e., greisen, skarn, stratabound cassiterite-sulfide (mostly oxidized) and vein type ore. In each deposit the orebodies typically occur in an extensive hydrothermal system centered on a shallow Late Cretaceous granitoid cupola. Metal zoning is well developed both vertically and horizontally over the entire district, from W + Be + Bi Mo Sn ores inside granite intrusions, to Sn + Cu-dominated ores at intrusion margins and farther out to Pb + Zn deposits in the surrounding host carbonate. This zoning pattern is similar to that of other hydrothermal deposits in other parts of the world, indicating a close genetic relationship between magmatism and mineralization. In this paper, we dated thirteen mica samples from all types of mineralization and from the five deposits in the Gejiu district. The ages range from 77.4 0.6 Ma to 95.3 0.7 Ma and are similar to the existing zircon UPb age of the granitic intrusions (77.4 2.585.8 0.6), indicating a genetic relationship between the mineralization and the intrusions. Geological characteristics, metal zoning patterns and new geochronological data all indicate that the tin-polymetallic ores in the Gejiu district are hydrothermal in origin and are genetically related to the nearby granitic intrusions. It is unlikely that the deposits are syngenetic, as has been proposed in recent years.

Item Details

Item Type:Refereed Article
Keywords:deposit geology, metal zoning, 40Ar39Ar dating, ore genesis, Gejiu
Research Division:Earth Sciences
Research Group:Geology
Research Field:Ore Deposit Petrology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Mineral Exploration not elsewhere classified
Author:Chang, Z (Dr Zhaoshan Chang)
ID Code:95358
Year Published:2013
Web of Science® Times Cited:19
Deposited By:Earth Sciences
Deposited On:2014-09-30
Last Modified:2014-11-11
Downloads:0

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