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首页> 外文期刊>Earth sciences research journal >Rb-Sr Isotopic Geochronology and Geological Implications of Dongfeng Gold Deposit in Jiaodong Area
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Rb-Sr Isotopic Geochronology and Geological Implications of Dongfeng Gold Deposit in Jiaodong Area

机译：胶东地区东风金矿床的Rb-Sr同位素年代学及其地质意义

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摘要

The superlarge Dongfeng gold deposit is located in the Potouqing faults-alteration belt of the eastern part of the 'Zhao-Lai-gold ore belt', which belongs to the northwestern part of the Jiaodong area. Tectonically, ore bodies are controlled by faults and gold mainly occurs in the pyrite and polymetallic sulfide-bearing quartz vein. In this paper, Rb-Sr isotopic analysis is carried out with the beresite, which formed by hydrothermal metasomatism, and the Rb-Sr isochron age is 125.5±6.7Ma, indicating this deposit set up in the early Cretaceous of the late Yanshanian. Based on the relationship between the Dongfeng gold deposit and the Mesozoic granite, it is suggested that the formation of the gold deposit is a complex geological process of gradual enrichment and precipitation of the ore-forming elements. The initial 87Sr/86Sr ratio of the beresite is 0.711502±0.000069, which indicates the ore-forming materials mainly come from the crust. Combined with the complex mineralization process of the Dongfeng gold deposit and the reported H-O isotopic data, it is suggested that the ore-forming materials are mainly derived from the crust with some mantle materials, while the ore-forming fluids are originated primarily from magmatic hydrothermal and mantle with some precipitate water.
机译：超大型东风金矿床位于“赵莱金矿带”东部的坡头青断层蚀变带上，该带属于胶东地区的西北部。从构造上看，矿体受断层控制，金主要存在于黄铁矿和含多金属硫化物的石英脉中。本文对由水热变质作用形成的贝雷石进行了Rb-Sr同位素分析，Rb-Sr等时年龄为125.5±6.7Ma，表明该矿床形成于燕山晚期白垩纪早期。根据东风金矿床与中生代花岗岩之间的关系，认为金矿床的形成是一个复杂的地质过程，逐渐富集和沉淀成矿元素。该贝雷石的初始 87 Sr / 86Sr比为0.711502±0.000069，表明成矿物质主要来自地壳。结合东风金矿床复杂的成矿过程和所报道的HO同位素数据，表明成矿物质主要来自地壳和一些地幔物质，而成矿流体主要来源于岩浆热液。并用一些沉淀水套住。

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