资源与产业 ›› 2015, Vol. 17 ›› Issue (2): 78-83.

• 自然重砂资料应用 • 上一篇    下一篇

西藏丁青一带铬铁矿自然重砂异常特征及其成矿响应

隋真龙1,*,董国臣1,*,董亮琼1,邓午忠2   

  1. 1中国地质大学 地球科学与资源学院,北京 100083; 2西藏自治区地质调查院,西藏 拉萨 850006
  • 收稿日期:2014-10-18 修回日期:2015-01-26 出版日期:2015-04-20 发布日期:2015-04-20
  • 通讯作者: 隋真龙(E-mail: 732393576@qq.com) 董国臣(E-mail: donggc@cugb.edu.cn)

INDICATION OF HEAVY MINERALS ANOMALY OF DINGQING’S  CHROMITE DEPOSIT IN TIBET

SUI Zhenlong1,*, DONG Guochen1, DONG Liangqiong1, DENG Wuzhong2   

  1. 1School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;  2. Tibet Geological Survey, Lasha 850006, China
  • Received:2014-10-18 Revised:2015-01-26 Online:2015-04-20 Published:2015-04-20

摘要:

铬铁矿自然重砂及其组合对超基性岩型铬铁矿床具有良好的响应,而青藏高原有多条蛇绿岩带,其中发育有大量超基性岩体,自然重砂及其矿物组合是否能够反映其铬铁矿的成矿信息是一个值得研究的问题。针对区域已有资料,对西藏丁青一带铬铁矿自然重砂异常特征、分布规律及与相关矿床点的响应程度进行归纳分析,探寻其中蕴含的成矿作用信息。已有研究表明,超基性岩型铬铁矿的自然重砂标志矿物组合为铬铁矿+铬尖晶石。西藏丁青一带铬铁矿自然重砂异常主要集中分布在结合带及其两边,与结合带超基性岩具有密切依存关系,其高值点与铬铁矿床(点)响应程度较高。这些特征及规律对于今后铬铁矿找矿工作具有重要指示意义。

关键词: 铬铁矿, 超基性岩, 西藏丁青, 自然重砂, 响应程度

Abstract:

Chromite heavy minerals and their combination have a good response to ultrabasic chromite deposits. There are many ophiolite belts holding ultrabasic rocks in the Tibetan plateau. It is worthwhile studying the indication of heavy minerals and their combination to chromite mineralization. This paper describes the anomaly distribution of chromite and its related mineral placers, summarizes their response extent to chromite mineralization around Dingqing of Tibet based on existing data, which would provide prospecting information to find the deposit. Research proves that the natural heavy placer combinations of ultrabasic chromite deposits are chromite and chromium spinel. Based on the heavy minerals survey, their anomalies in Dingqing area mainly distribute around the suture zone, closely related with ultrabasic rocks in genesis. Chromite high anomalies are highly response to chromite deposits (occurrences). These characteristics may provide indication for prospecting chromite ore deposits.

Key words: chromite, ultrabasic rocks, Dingqing of Tibet, heavy minerals, response extent

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