Formation of the adakite-like granitoid complex and porphyry copper-gold deposit in Shaxi from southern Tancheng-Lujiang fault belt： A clue to the West Pacific plate subduction

On the basis of the geological and geochemical studies, including chemical analysis of bulk rocks, rare-earth and trace element studies, fluid inclusion, and S and O isotopic analyses, the authors described the geological background of the deposit in detail and presented significant proofs for the c...

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Bibliographic Details
Published in:Acta geochimica 2009-03, Vol.28 (1), p.28-43
Main Authors: Lan, Xianghua, Yang, Xiaoyong, Yu, Liangfan, Zhang, Qianming
Format: Article
Language:English
Subjects:
Chemical analysis
Copper
Earth and Environmental Science
Earth Sciences
Geochemistry
Gold
Igneous rocks
Jurassic
Meteoric water
Mineralization
Rocks
Studies
Trace elements
物化环境
金成矿
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Summary:On the basis of the geological and geochemical studies, including chemical analysis of bulk rocks, rare-earth and trace element studies, fluid inclusion, and S and O isotopic analyses, the authors described the geological background of the deposit in detail and presented significant proofs for the conditions of formation of the Shaxi porphyry copper-gold deposit. Compared with other large and supper-large porphyry copper deposits in China and the adjacent Cu-Au mineralized areas, the ore-forming processes and conditions were analyzed; and the possibil- ity of forming large porphyry copper deposits in the Shaxi area was discussed. The present study indicated that the ore-forming fluid and material were mainly of magmatic origin, while meteoric water played a certain role in the ore-forming processes. Interactions between subducting and overriding plates provided a major driving force for the formation of igneous rocks and the deposition of metal elements in East China since Jurassic. Based on the geochemical data of the Shaxi intrusive, it is found that the copper （gold） mineralization is closely related to the genesis of adakite-like intrusive in the Shaxi area. This adakite-like intrusive was formed in the subduction environment as a result of the subduction of the West Pacific plate toward the East China continent, where there is a great potentiality to form a large porphyry copper deposit.
ISSN:1000-9426
2096-0956
1993-0364
2365-7499
DOI:10.1007/s11631-009-0028-7