| 浙江省诸暨至龙泉一带金矿床的铅同位素地球化学研究 |
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| 引用本文： | 林兵.浙江省诸暨至龙泉一带金矿床的铅同位素地球化学研究[J].地质科学,1988,0(2):128-136. |
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| 作者姓名： | 林兵 |
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| 作者单位： | 浙江省地质科学研究所 |
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| 基金项目： | 浙江省龙泉至诸暨一带金矿科研项目 |
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| 摘 要： | 本文研究了浙江省诸暨至龙泉一带金矿床的铅同位素地球化学特征。通过研究铅同位素组成、源区特征值和模式年龄,对该区金矿床得出以下两点认识:1.该区金矿床铅同位素组成在区域上具有一定的变化趋势,并可分为二大类,即正常铅和弱放射性成因异常铅,它们反映了一定的物源特征;2.该区金矿床的区域成矿时代为400—700Ma,结合区域成矿地质特征,可以证明该区金矿床主要为变质热液矿床。
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| 关 键 词： | 铅同位素组成 源区特征值 模式年龄 成矿时代 基底地层 变质热液成因 构造环境 |
| 收稿时间： | 1986-06-01 |
| 修稿时间： | 1986-06-01; |
GEOCHEMISTRY OF THE LEAD ISOTOPES IN THE GOLD DEPOSIT ZONE FROM ZHUJI TO LONGQUAN, ZHEJIANG PROVINCE |
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| Lin Bing.GEOCHEMISTRY OF THE LEAD ISOTOPES IN THE GOLD DEPOSIT ZONE FROM ZHUJI TO LONGQUAN, ZHEJIANG PROVINCE[J].Chinese Journal of Geology,1988,0(2):128-136. |
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| Authors: | Lin Bing |
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| Institution: | Institute of Geological Sciences, Geological Bureau of Zhc Jiang Province |
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| Abstract: | The geochemical characteristics of the lead isotopes in the gold deposit zone from Zhuji to Longquan, Zhejiang Province, have been studied. According to the isotopic composition, μ, ω, κ and model age of lead, the isotopic compositions of the gold deposits can be divided into two types representing different sources of ore materials: (1) ordinary lead, such as the situation of Huangshan and Zhongao deposits. With stable lead isotopic compositions and characteristic parameters of the source region of island arc area in these deposite, in which the rock has not been contaminated by the crustal radiogenic lead; (2) weak rediogenic anomalous lead, with Zhilingtou and Babaoshan deposits known as this type lead, which can be characterized by the higher and scattered isotopic ratios and characteristic parameters, indicating the mixing metal sources mainly derived from the upper crust.The regional metallogenic age of the gold deposits has been estimated from 400 to 700 Ma, which is the same as the main metamorphic age(400-700 Ma) of the basement strata in this area. So, the gold deposits in this area should be classified genetically mainly into metamor-phic hydrothermal gold deposits. Furthermore, a few of model age data of the gold deposits with weak radiogenic anomalous lead indicate that the deposits have undergone superimposed volcanogenic and magmatic hydrothermal mineralization during Yenshan movement. |
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| Keywords: | lead isotopic composition characteristic parameter of source region model age metallogenic age basement strata metamorphic hydrothermal genesis geologic environment |
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