投稿时间：2019-01-04
修订日期：2019-06-12
网络发布日期：2019-12-24
中文摘要:铁格隆南和多不杂矿床是西藏多龙整装勘查区的2个主要矿床，目前控制铜资源量1400万吨。2个矿床空间距离仅6~7 km，它们之间的构造关系和深部资源潜力仍不明确。笔者在铁格隆南和多不杂矿区实施音频大地电磁测深，识别出多条逆冲推覆断层。通过恢复原始矿体的形态，进一步确认了被荣那沟断层错失的另一半矿体，预测铁格隆南矿床铜资源量可能达到2000万吨以上。在多不杂识别出被推覆构造错失的矿体，推测多不杂铜资源量400~500万吨。本次勘查地球物理工作构建了铁格隆南-多不杂对冲断层储矿格架，提出美日切错组安山岩和逆冲推覆断层对矿体的保存具有双重作用，建议优先对铁格隆南荣那沟断层下盘物探异常实施深钻验证。
Abstract:The Duolong ore district in Tibet is one of the largest porphyry copper ore concentration areas in China. As important deposits in Duolong, the Tiegelongnan and the Duobuza deposits contain nearly 14 million tons of copper resources currently. Although researchers all believe that these deep and peripheral areas still have great prospecting potential, the structural spatial relationship between the two deposits (6~7 km apart from each other) is still unclear. The Audio-frequency Magnetotellurics(AMT)was employed in the Tiegelongnan and Duobuza mining areas. Based on thrust fault discovery, the orebody which was displaced by the Rongna valley fault was further confirmed. It is inferred that the original ore bed is in an ellipsoid form, and therefore the copper resources of the Tiegelongnan deposit may reach more than 20 million tons. The missing orebody in Duobuza was identified at the footwall of the thrust fault, and it is initially held that the amount of copper is between 4 and 5 million tons. Based on the exploration geophysical work, the authors constructed the ore-controlling framework of Tiegelong-nan-Duobuza ramp style thrust faults and reached the conclusion that the volcanic cover and the thrust faults have exerted a dual effect on preservation of the orebody. The authors suggest giving priority to carrying out deep drilling at the footwall of the Rongna valley fault to verify geophysical anomalies.
文章编号：
中图分类号：P618.41
文献标志码：
基金项目:本文得到中国地质调查局项目（编号：DD20190167）、国家重点研发计划项目（编号：2018YFC0604106）和自然资源部杰出青年人才培养计划联合资助
引用文本：
宋扬,唐菊兴,刘治博,李发桥,王勤,肖扬,王阳玲.2019.西藏铁格隆南-多不杂矿床对冲储矿机制——地球物理勘查的证据[J].矿床地质,38(6):1263~1277SONG Yang,TANG JuXing,LIU ZhiBo,LI FaQiao,WANG Qin,XIAO Yang,WANG YangLing.2019.Mechanism of Tiegelongnan-Duobuza ramp style ore-controlling structure, Tibet: Evidence from geophysical exploration[J].Mineral Deposits38(6):1263~1277
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