The Composition of Sulfur and Lead Isotope and the Source of Metallogenic Material from Xiyuan and Jiangjia Ore Blocks in the Dongyuan

Abstract

Abstract:

The Dongyuan WMo deposit, located in Qimen County in southern Anhui Province, is the largest WMo deposit in this region thus far reported. The deposit consists of Dongyuan, Xiyuan, and Jiangjia ore blocks. The WMo orebodies in Jiangjia and Xiyuan ore blocks are mainly occurred in granodiorite porphyry and the nearby contact zone, with the major type of veinletdisseminated and disseminated mineralization. The measured δ³⁴SVCDT values of Jiangjia (2.6‰ to 4.9‰) and Xiyuan (4.0‰ to 4.7‰) ore blocks vary in a very limited range and suggest that the formation of WMo orebody is closely related to magmatism, which involve the sulfur may be leached from the granodiorite intrusion. Based on tectonic patterns of lead isotope and related paramerters, the lead isotopic compositions of Jiangjia (²⁰⁶Pb/²⁰⁴Pb=18.222 to 18.369, ²⁰⁷Pb/²⁰⁴Pb=15.579 to 15.618, ²⁰⁸Pb/²⁰⁴Pb=38.264 to 38.400) and Xiyuan (²⁰⁶Pb/²⁰⁴Pb=18.240 to 18.251, 207Pb/204Pb=15.604 to 15.618, 208Pb/204Pb=38.360 to 38.442) indicate that the metallogenic material is closely related to magmatism, and their leads are characterized by the source of lower crust and show crustmantle mixing.

Key words: metallogenic material, isotope, WMo deposit; , southern Anhui Province

DU Yu-Diao, TU Xin-Qi, ZHOU Xiang, FU Jian-Zhen. The Composition of Sulfur and Lead Isotope and the Source of Metallogenic Material from Xiyuan and Jiangjia Ore Blocks in the Dongyuan[J]. Geoscience, 2011, 25(5): 861-868.

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