| 江西金山金矿含金黄铁矿的Rb-Sr年龄 |
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| 引用本文：毛光周,华仁民,高剑峰,龙光明,陆慧娟.2008.江西金山金矿含金黄铁矿的Rb-Sr年龄[J].地球学报,29(5):599-606. |
| DOI：10.3975/cagsb.2008.05.09 |
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| 基金项目:国家自然科学基金项目(编号:40373025) |
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| 中文摘要:前人对江西金山金矿的成矿时代有许多不同的认识,笔者通过对江西金山蚀变岩型矿石中的含金黄铁矿Rb-Sr年龄的测定得出,含金黄铁矿的Rb-Sr等时线年龄为(838±110)Ma,initial87Sr/86Sr=0.7045±0.0020。由此可以推测晋宁期是蚀变岩型金矿体形成的主要时期。黄铁矿Rb-Sr所得的Sr同位素初始比(87Sr/86Sr)i小于陆源硅酸盐的值(0.720),而与玄武岩的值(0.704)接近,结合前人有关的同位素及稀土、微量元素研究,笔者认为金山金矿变质岩型矿体的成矿物质源于变质围岩,成矿流体为来源于深部的变质水。 |
| 中文关键词:金矿 成矿时代 Rb-Sr定年 物质来源 江西金山 |
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| Rb-Sr Age of Gold-bearing Pyrite in the Jinshan Gold Deposit,Jiangxi Province |
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| Abstract:There are many different views concerning the metallogenic epoch of the Jinshan gold deposit. The authors tested the Rb-Sr age of the gold-bearing pyrite from the metamorphic ore bodies in the Jinshan gold deposit. The Rb-Sr isochron age of the Au-bearing pyrite is about (838±110) Ma, and the initial 87Sr/86Sr is equal to 0.7045± 0.0020. It is thus held that the Jinning Period is the main time for the formation of the metamorphic gold deposit. The (87Sr/86Sr) i value of the pyrite is lower than that of the terrigenous silicates (0.720) and close to that of the basalts (0.704). In combination with previous isotope, REE and trace element studies, the authors consider that the ore-forming material of the metamorphic ore bodies in the Jinshan gold deposit was derived from the metamorphic rock, and the ore-forming fluid originated from the deep metamorphic water. |
| keywords:gold deposit metallogenic epoch Rb-Sr dating material resource Jinshan Jiangxi Province |
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