富湾超大型银矿床Ar-Ar年龄、铅同位素特征及形成条件分析

Abstract

Abstract: The Fuwan superlarge silver deposit is hosted in the Early Carboniferous limestones along a contact fault zone between the limestone and the overlying Changkeng Au-hosting siliceous rocks. The ⁴⁰Ar-³⁹Ar age of the ore-related quartz veins from the Fuwan silver deposit is （64.3±0.1） Ma. The silver deposit is characterized by high μ values (10.67~10.95) in Pb isotopic composition, being much higher than those of the Paleozoic ore-hosted strata and being similar to those of ores hosted in Preterozoic metamorphic base in the Western Guangdong Province. It is concluded that the ore-forming material of the superlarge silver deposit came primarily from the Proterozoic basement. The superlarge silver deposit owns its origin to the Himalayan volcanic activities in the region of the Sanshui Basin.The formation of Fuwan superlarge silver deposit is controlled by the following favorable geological conditions: The intersection of deep faults and contemporaneous faults at the margins of the Sanshui Basin served as excellent passageways for ore fluids; the special ore-hosted rock association served as the ore-concentration and ore-trapping structures; the silver-rich basement，multiple stages of mineralization and of mobilization of silver and related elements; geothermal convection system related to multiple episodes of volcanic activities.

Key words: silver deposit, superlarge deposits, ore genesis, Central Guangdong Province

CLC Number:

P618.52

LIANG Hua-ying,YU Heng-xiang,ZENG Ti,XIA Ping. Studies on the Ar-Ar Age, Pb Isotope Features and Key Factors for the Formation of Fuwan Superlarge Silver Deposit in Guangdong Province[J].J4, 2006, 36(05): 767-773.

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Studies on the Ar-Ar Age, Pb Isotope Features and Key Factors for the Formation of Fuwan Superlarge Silver Deposit in Guangdong Province