吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (5): 1358-1372.doi: 10.13278/j.cnki.jjuese.20190295
• 整装勘查区矿床成因与成矿作用研究专辑 • 上一篇 下一篇
董志国1,2,3, 张连昌1,2,3, 董飞羽1,2,3, 张帮禄1,2,3, 谢月桥4, 查斌4, 彭自栋1,2, 王长乐1,2
Dong Zhiguo1,2,3, Zhang Lianchang1,2,3, Dong Feiyu1,2,3, Zhang Banglu1,2,3, Xie Yueqiao4, Zha Bin4, Peng Zidong1,2, Wang Changle1,2
摘要: 穆呼锰矿床位于西昆仑造山带玛尔坎苏锰矿带东段,研究程度相对薄弱。穆呼锰矿床的含矿地层为上石炭统喀拉阿特河组,自下而上可分为角砾灰岩、钙质杂砂岩和含炭质泥灰岩3个岩性段,具有完整的海侵层序特征,反映了由逐步断陷到稳定沉积的盆地演化过程。锰矿层赋存于第三岩性段炭质泥灰岩中,矿石矿物主要为化学组分纯净的泥晶菱锰矿。根据详细的矿相学观察并综合前人研究成果,笔者认为菱锰矿是初始沉淀的锰(氢)氧化物与有机质通过成岩反应形成的。这种成矿机制需要3个基本条件:丰富的锰质来源、氧化还原分层的海水和有机质的大量埋藏。在穆呼一带,有利于满足以上条件的主要控矿因素包括:伸展拉张的构造背景、强烈的海底热液活动、海侵事件和温暖潮湿的古气候。笔者根据w(Ba)-w(P2O5)图解并结合区域对比分析,初步认为穆呼锰矿床的成矿模式可能属于最小含氧量带扩张型。
中图分类号:
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