Re-Os isotopic dating of molybdenite from the Dahutang tungsten deposit in northwestern Jiangxi Province and its geological implication
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摘要:
江西省武宁县大湖塘钨矿位于武宁县西南方向41km，赣西北地区武宁、靖安、修水3县交界处，矿区处于下扬子成矿省之江南隆起东段成矿带之西部，是与燕山期花岗质岩浆活动有关的钨矿床, 也是最近刚勘查出的我国规模最大的钨矿床。本文采用辉钼矿Re-Os同位素定年技术，测得大湖塘石门寺矿段辉钼矿Re-Os等时线年龄为143.7±1.2Ma (n=6，MSWD=0.84);狮尾洞矿段辉钼矿Re-Os等时线年龄为140.9±3.6Ma (n=6，MSWD=2.30)。说明其成矿于早白垩世，与其北侧的、同处于下扬子成矿省的长江中下游成矿带九瑞-鄂东南矿集区的铜多金属矿床成岩成矿年龄非常一致，但与华南成矿省之南岭成矿带的钨矿成矿作用有诸多不同。下扬子成矿省主要为早期两大古陆碰撞对接、构造格局开始大转换时期成矿，而华南成矿省为地壳重熔形成的花岗质岩浆经过多期次和多阶段分异演化在最晚阶段富集成矿。
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关键词:
- Re-Os同位素定年 /
- 辉钼矿 /
- 大湖塘钨矿 /
- 下扬子成矿省 /
- 华南成矿省
Abstract:The Dahutang W deposit in Wuning County, Jiangxi Province lies in juncture of Wuning, Jing'an and Xiushui, southwestward 41km of Wuning County. Dahutang lies in the west part of the east metallogenic belt of Jiangnan uplift in the Lower Yangtze metallogenic province. The Dahutang W deposit is related with Yanshanian granites, and is the largest W deposit recently prospected in China. In this study, we obtain two molybdenite Re-Os ages, one for the Shimensi ore block which shows an isochron age of 143.7±1.2Ma (n=6, MSWD=0.84); another from the Shiweidong ore block with an isochron age of 140.9±3.6Ma (n=6, MSWD=2.30). These ages indicate that the mineralization took place during Early Cretaceous, which are similar to the Cu-polymetallic mineralization ages of the Jiurui ore belt on the Lower Yangtze metallogenic province but different to the ages of the South China W metallogenic province. The Lower Yangtze metallogenic province mineralization happened on the two early paleo-continents subduction zones but during the tectonic conversion period. The South China metallogenic province mineralization resulted from the crust remelting granitic magma differentiation and have suffered multiple stages of evolution.
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图 1
大湖塘钨矿狮尾洞矿段1170m中段地质图
Figure 1.
The geological map of 1170m level of Shiweidong ore block in the Dahutang W deposit
图 2
大湖塘钨矿石门寺矿段970m中段地质图
Figure 2.
The geological map of 970m level of Shimensi ore block in the Dahutang W deposit
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