| 新疆若羌喀腊大湾铁矿床辉钼矿Re-Os定年及成因 |
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| 引用本文： | 武彬,王爱国,张传林,鲍晓明,叶现韬,倪康.新疆若羌喀腊大湾铁矿床辉钼矿Re-Os定年及成因[J].地质通报,2019,38(8):1362-1368. |
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| 作者姓名： | 武彬 王爱国 张传林 鲍晓明 叶现韬 倪康 |
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| 作者单位： | 中国地质调查局南京地质调查中心, 江苏 南京 210016,中国地质调查局南京地质调查中心, 江苏 南京 210016,河海大学海洋学院, 江苏 南京 210098,中国地质调查局南京地质调查中心, 江苏 南京 210016,河海大学海洋学院, 江苏 南京 210098,福建省闽西地质大队, 福建 厦门 361000 |
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| 基金项目： | “十二五”国家科技支持计划项目《甜水海-塔什库尔干地块基底演化与成矿》（编号：2015BAB05B01-02） |
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| 摘 要： | 喀腊大湾铁矿是近年来在阿尔金地区发现的超大型铁矿,目前控制储量近亿吨,且该铁矿具有品位高,低硫低磷等特点。由于矿床围岩的特殊性,该矿床的成因一直存在较大争议。利用Re-Os同位素定年方法,对喀腊大湾矿体中的5件辉钼矿样品进行了成矿时代测定,获得辉钼矿Re-Os同位素模式年龄为490±11Ma,等时线年龄为481.9±7.6Ma。二者在误差范围内基本一致。该年龄与成矿相关岩体的SHRIMP锆石U-Pb年龄488±5Ma及479±4Ma吻合,且发现的矿体附近都有闪长岩体出露,表明成岩和成矿关系密切。结合岩石学、矿物学及年代学特征,认为喀腊大湾铁矿为矽卡岩矿床。
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| 关 键 词： | 喀腊大湾 铁矿 Re-Os定年 矿床成因 |
| 收稿时间： | 2017/8/30 0:00:00 |
| 修稿时间： | 2018/11/10 0:00:00 |
The molybdenite Re-Os dating and genesis of the Kaladawan iron deposit, Ruoqiang, Xinjiang |
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| WU Bin,WANG Aiguo,ZHANG Chuanlin,BAO Xiaoming,YE Xiantao and NI Kang.The molybdenite Re-Os dating and genesis of the Kaladawan iron deposit, Ruoqiang, Xinjiang[J].Geologcal Bulletin OF China,2019,38(8):1362-1368. |
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| Authors: | WU Bin WANG Aiguo ZHANG Chuanlin BAO Xiaoming YE Xiantao and NI Kang |
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| Institution: | Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China,Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China,College of Oceanography, Hohai University, Nanjing 210098, Jiangsu, China,Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China,College of Oceanography, Hohai University, Nanjing 210098, Jiangsu, China and Minxi Geological Party of Fujian Province, Xiamen 361000, Fujian, China |
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| Abstract: | The Kaladawan iron deposit was discovered in the Arkin area in recent years. It is a superlarge iron deposit with controlled reserves of nearly 100 million tons, and characterized by high grade, low sulfur and low phosphorus. Due to the particularity of the surrounding rocks of the deposit, there has been a big controversy on the genesis of the deposit. In this paper, the Re-Os isotopic dating method was used to determine the metallogenic epoch of the five molybdenite samples from the Kaladawan orebody, and the molybdenite Re-Os isotopic model age is 490±11Ma, isochron age is 481.9±7.6Ma. Both are basically consistent within the error range. The ages coincide with the SHRIMP U-Pb ages of the mineralization-related rock of 488±5Ma and 479±4Ma, and there is also diorite exposed near the orebody, which shows close relationship between petrogenesis and mineralization. Combined with petrology, mineralogy and chronological characteristics, the authors hold that the Kaladawan iron deposit is a skarn deposit. |
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| Keywords: | Kaladawan iron deposit Re-Os dating deposit genesis |
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