鄂东鸡冠嘴矿区成矿岩体锆石SHRIMP U-Pb定年及其意义
SHRIMP U-Pb Zircon Dating of the Mineralized Intrusion from Jiguanzui Orefield in Eastern Hubei Province and Its Geological Significance
李华芹 1陈富文 1梅玉萍1
作者信息
- 1. 中国地质调查局宜昌地质矿产研究所,湖北,宜昌,443003
- 折叠
摘要
间破碎带中,推测成矿作用应略晚于石英正长闪长玢岩(146±2Ma)而早于闪长岩侵位的时间(132±4Ma),这与前人获得长江中下游铜铁金成矿带代表性矿床的辉钼矿Re-Os模式年龄分布在134.7～143Ma的研究结果一致.
Abstract
The Jiguanzui Cu-Au (Fe) deposit is located at northwest part of the Yangxin intrusion and neighbours on the Tonglushan Cu-Au (Fe) deposit. The mineralized intrusion in the orefield consists mainly of quartz orthoclase diorite porphyrite, quartz diorite, diorite and andesite porphyrite, and the quartz orthoclase diorite porphyrite is closely related with the Cu-Au(Fe) mineralization. Zircon SHRIMP U-Pb ages with 146 ±2 Ma (95% confidence, MSWD =1.3) for quartz orthoclase diorite porphyrite and 132 ±4 Ma (95% confidence, MSWD =3) for diorite in the orefield show that the porphyrite and diorite were formed during Early Yanshanian and Late Yanshanian period, respectively. According to that the orebodies occur mainly in the contact zone of the mineralized intrusion or interlayer fractured zone, the authors believe that the mineralization happened between emplacement of the quartz orthoclase diorite porphyrite (146 ±2 Ma) and diorite (132 ±4 Ma) , which accords with the molybdenite Re-Os age (134. 7 ~ 143 Ma) of representative Cu-Au (Fe) deposits in the middle and lower reaches of the Yangtze River.
关键词
成矿岩体/锆石SHRIMP定年/铜金(铁)矿床/鸡冠嘴Key words
mineralized intrusion/zircon SHRIMP U-Pb dating/Cu-Au( Fe) deposit/Jiguanzui引用本文复制引用
基金项目
国家科技支撑计划(2006BAB01B03)
国土资源大调查(1212010633903)
国土资源大调查(1212010634002)
出版年
2009
NETL
NSTL
维普
万方数据