新特提斯缝合带中段豆荚状铬铁矿成矿规律对比研究
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本文为中国地质调查局项目(编号121201112036、12120115066801)资助的成果。


Comparative Study of Metallogenic Regularities of Chromite Deposits in the Middle of the Neotethys Suture Zone
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    摘要:

    新特提斯缝合带中的铬铁矿带是全球最重要的豆荚状铬铁矿成矿带之一,尤其是新特提斯缝合带中段,即穆斯林巴赫 科希斯坦 雅鲁藏布江一带,自东向西发育罗布莎、马拉坎德、穆斯林巴赫等若干大型铬铁矿床。本文系统总结和梳理新特提斯缝合带中段蛇绿岩的时空分布特征以及典型豆荚状铬铁矿的矿床特征、赋存规律和控矿因素。研究表明,蛇绿岩形成时代主体为中侏罗世—晚白垩世,自东向西大致呈逐渐变新的趋势,构造侵位的时代相近,为古新世—始新世;马拉坎德、瓦济里斯坦、穆斯林巴赫及贝拉铬铁矿,与罗布莎矿床相似,均属于富铬型铬铁矿,产于SSZ相关构造背景下,显示良好的岩相分带,具有良好的成矿条件;提出下一步找矿方向是针对成矿条件优越的蛇绿岩,解析层序剖面,识别纯橄岩与方辉橄榄岩的岩相分带,确定有利赋矿岩相。

    Abstract:

    The chromite ore belt in the Neotethys suture zone is one of the most important podiform chromite metallogenic zones in the world, particularly in the middle section of this suture zone, namely Muslim Bagh- Kohistan-Yarlung Zangbo ophiolitic belt, in which there occur a number of large chromite deposits, such as Luobusha, Malakand, and Muslim Bagh deposit. The time-space distribution features of the ophiolites and the characteristics, occurrence regularities, ore-controlling factors of the typical chromite deposits in the belt are systematically summed up. The study shows that the ophiolites formed mainly during middle Jurassic to late Cretaceous, and tend to be younger from east to west roughly, with the similar emplacement age from Paleocene to Eocene. The features of chromite deposits at Malakand, Waziristan, Muslim Bagh and Bela are similar to that of the Luobusha chromite, and all of them belong to Cr-rich chromite and formed in SSZ related tectonic setting. These deposits show distinct petrographic zones and advantageous metallogenic conditions. Therefore, It suggests that future exploration should focus on the ophiolite zone. The analysis of sequence profiles and dunite-harzburgite petrographic zones will help find favorable ore-bearing areas.

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洪俊,姚文光,张晶,张辉善,吕鹏瑞,杨博.2015.新特提斯缝合带中段豆荚状铬铁矿成矿规律对比研究[J].地质学报,89(9):1618-1628.
HONG Jun, YAO Wenguang, ZHANG Jing, ZHANG Huishan, LV Pengrui, YANG Bo.2015. Comparative Study of Metallogenic Regularities of Chromite Deposits in the Middle of the Neotethys Suture Zone[J]. Acta Geologica Sinica,89(9):1618-1628.

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  • 在线发布日期: 2015-09-16
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