西藏冈底斯东段南缘桑布加拉辉钼矿Re-Os定年及地质意义

赵珍; 胡道功; 吴珍汉; 陆露

西藏冈底斯东段南缘桑布加拉辉钼矿Re-Os定年及地质意义

1.
中国地质科学院地质力学研究所, 北京 100081
2.
中国地质科学院, 北京 100037

基金项目:

中国地质调查局项目 1212011120185

详细信息

作者简介:
赵珍(1987-), 女, 硕士研究生, 构造地质学专业。E-mail:zhaozhen03@126.com

中图分类号: P597
计量
- 文章访问数: 238
- HTML全文浏览量: 144
- PDF下载量: 6
- 被引次数: 0
出版历程
- 收稿日期: 2011-12-08
- 刊出日期: 2012-06-01

MOLYBDENITE Re-Os ISOTOPIC DATING OF SANGBUJIALA COPPER DEPOSIT IN THE SOUTH MARGIN OF THE EASTERN GANGDESE SECTION, TIBET, AND ITS GEOLOGICAL IMPLICATIONS

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Chinese Academy of Geological Sciences, Beijing 100037, China

摘要

摘要: 雅鲁藏布江缝合带北侧的桑布加拉矽卡岩型铜矿床为冈底斯成矿带南亚带典型多金属矿床之一。该矿床的8件辉钼矿样品Re-Os等时线年龄为（93.3±4.1）Ma，平均模式年龄为（94.5±1.6）Ma，表明桑布加拉矿床形成于晚白垩世新特提斯洋向北俯冲消减阶段。洋壳俯冲消减阶段形成的桑布加拉铜矿床及其新生代不同时期多金属矿床的发现，说明冈底斯成矿带在俯冲消减阶段、主碰撞阶段、晚碰撞阶段和后碰撞阶段均存在大规模成矿作用，并构成完整的成矿演化系列。
- Re-Os同位素年龄 /
- 辉钼矿 /
- 矽卡岩型铜矿 /
- 冈底斯 /
- 成矿演化
Abstract: Located in north side of Yaluzangbujiang Suture, Sangbujiala skarn-type copper deposit is one of the typical polymetallic deposits in the south subzone of the Gangdese metallogenic belt. For the purpose of finding out the mineralization time, the authors selected eight molybdenite samples from Sangbujiala ore district to perform the Re-Os dating. The age of Re-Os isotime line from molybdenite is 93.3±4.1 Ma, with an average model age of 94.5±1.6 Ma. Therefore, the Sangbujiala ore formed during Late Cretaceous, which belongs to the Neo-Tethys subduction stage. The Sangbujiala ore and other Cenozoic deposits showed that the Gangdese metallogenic belt occurring large-scale mineralization in the subduction stage, main collision stage, late collision stage and post-collisional stage, and to form a complete series of metallogenic evolution.
- Re-Os isotope age /
- molybdenite /
- skarn-type copper deposit /
- Gangdese /
- metallogenic evolution

HTML全文

图 1 冈底斯矿带地质简图及矿床分布（据文献[3]修改）

Figure 1. Simplified geological map of the Gangdese ore belt and distribution of deposits

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图 2 桑布加拉矿区地质简图

Figure 2. Simple geological map of Sangbujiala copper deposit

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图 3 桑布加拉矿区野外照片

Figure 3. Photos of Sangbujiala copper deposit

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图 4 桑布加拉铜矿辉钼矿Re-Os同位素等时线

Figure 4. Re-Os isotime line of molybdenite from Sangbujiala copper deposit

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图 5 桑布加拉铜矿辉钼矿Re-Os平均模式年龄

Figure 5. The average of Re-Os model age of molybdenite from Sangbujiala copper deposit

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图 6 冈底斯东段多期成矿事件年代学简图（据文献[1]修改）

Figure 6. Chronology of metallogenic stages in eastern Gangdese

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表 1 桑布加拉铜矿辉钼矿Re-Os同位素数据

Table 1. Re-Os isotopic datum of molybdenite from Sangbujiala copper deposit

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