| 四川夏塞银多金属矿床地质特征及成因 |
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| 引用本文：.2003.Geological Characteristics and Genesis of Xiasai Silver_Polymetallic Deposit in Western Sichuan Province[J].Mineral Deposits,22(2):121~128 |
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| 中文摘要:文章对夏塞银多金属矿床形成的地质背景、矿床地质特征和成矿机制进行了研究。研究结果表明，矿床位于义敦岛弧带昌多阔—格聂花岗岩带中段的绒依措岩体北侧，矿体产出部位严格受断裂破碎带的控制，矿体主要为似层状(大脉状)、脉状、透镜状。容矿岩石主要为绢云母板岩、长石石英砂岩。矿石类型简单，主要为银铅矿石、银铅锌矿石、银多金属矿石及银锌矿石。矿化富集与燕山晚期绒依措花岗岩密切相关。硫、铅同位素及流体包裹体研究表明成矿流体是岩浆水与大气水混合形成的中低温热液。矿床属受断裂破碎带控制的充填-交代型矿床。 |
| 中文关键词:地质学 夏塞银铅锌矿 地质特征 矿床成因 四川 |
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| Geological Characteristics and Genesis of Xiasai Silver_Polymetallic Deposit in Western Sichuan Province |
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| Abstract:The Xiasai silver_polymetallic deposit is a superlarge ore deposit discovered in recent years in western Sichuan Province. Located about 2 km north of Rongyicuo composite granite in the central part of Changduoke-Genie granite belt in Yidun arc belt, the deposit occurs in sandy slate beds of Upper Triassic Tumugou Formation. The orebodies are strictly controlled by faults and fractures and mostly take the forms of large veins, veins, lenses and bags. Ore types of the deposit are quite simple, being mainly of Ag-Pb, Ag-Pb-Zn, Ag-Polymetallic and Ag-Zn associations. Nevertheless, the ore mineral assemblage includes more than 50 minerals. The mineralization is closely related to Yanshanian Rongyicuo granite and may be divided into 5 stages. The formation temperature varies from 100℃ to 180℃, whereas the ore Pb model ages range from 53.8 Ma to 66.5 Ma. Based on geological and geochemical studies, it is pointed out that the Xiasai silver polymetallic deposit is a product of the infilling of ore-forming fluid and the metasomatism in structural fractures, and belongs genetically to middle_epithermal solution infilling and metasomatism type with mixed fluids of magmatic solution and meteoric water. |
| keywords:geology, Xiasai, silver-polymetallic deposit, geological characteristics, genesis, Sichuan |
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