| 西藏班公湖-怒江成矿带发现硫化镍矿 |
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| 引用本文：曲晓明,赵元艺,王瑞江,李佑国,辛洪波,代晶晶,江军华,陈 华.2009.Discovery of magmatic nickel sulfide mineralizations in Bangong Lake-Nujiang metallogenic belt, Qinghai-Tibet plateau[J].Mineral Deposits,28(6):729~736 |
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| 基金项目:“十一五”国家科技支撑计划项目（编号：2006BAB01A05）和中国地质调查局大调查项目（编号：1212010818097） |
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| 中文摘要:野外地质调查结合室内显微镜研究和电子探针分析，发现西藏班公湖-怒江缝合带 西段班公湖地区产有超基性岩型硫化镍矿和碳酸岩型硫化镍矿，中段班戈县产有超基性岩型 Ni、Cr、Co多金属矿。这两个地区的含矿岩体均为超基性岩，大小从几十米到几百米不等， 沿 NWW方向展布，反映了蛇绿岩带对矿化的控制。岩体中普遍具有强烈的蛇纹石化，金属矿物 组合简单，主要为硫镍矿和硫铁矿，呈微细粒浸染状分布，在野外露头和手标本上肉眼看不 出矿化。由于该缝合带规模巨大，以基性_超基性岩为标志的蛇绿混杂岩数量多，分布广， 因此，在该成矿带寻找超基性岩型硫化镍矿的找矿潜力很大。而碳酸岩型硫化镍矿化作为一 种新的矿化类型，对其岩体成因和矿化机理的研究将具有探索造山带演化和指导地质找矿的 双重意义。另外， 无论是超基性岩型硫化镍矿还是碳酸岩型硫化镍矿，在西藏地区很少报道，这种矿化类型是 班公湖_怒江成矿带上一个新的找矿方向。 |
| 中文关键词:地质学 超基性岩型硫化镍矿 碳酸岩型硫化镍矿 班公湖-怒江成矿带 青藏高原 |
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| Discovery of magmatic nickel sulfide mineralizations in Bangong Lake-Nujiang metallogenic belt, Qinghai-Tibet plateau |
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| Abstract:Based on field geological investigation combined with microscopic observation an delectron microprobe analysis, the authors have revealed that there occur ultra basic rock-type and carbonate-type nickel sulfide mineralizations in Bangong Lak e area within the western segment of the Bangong Lake-Nujiang suture zone and ul trabasic-type Ni, Cr, Co polymetallic mineralizations in Bange County within the middle segment of the suture zone. The ore-bearing bodies are all ultrabasic ro cks whose sizes range from tens to hundreds of meters. The mineralizations ar e d istributed in NWW direction and are controlled by the ophiolitic chaotic melange. The ore-bearing ultrabasic rock bodies have all experienced strong serpentiniz ation and contain a simple metallic association consisting mainly of NiS and Fe-Ni-S. The metallic sulfides assume a fine-grained dissemination, which cannot be discerned by naked eyes in field exposures and hand specimens. Taking into accoun t the huge distribution of the ophiolitic melange marked by basicultrabasic roc ks in the suture zone, the authors hold that the ultrabasic-type nickel sulfide mineralizations should have a large resource potential. Meanwhile, as a new mine ralization type, the carbonate-type nickel sulfide mineralization has an indicat ive meaning both in orogenic evolution and in regional prospecting. Moreover, bo th the ultrabasic_type mineralization and the carbonate-type nickel sulfide mine ralization are reported for the first time in Tibet. They hence constitute a new exploration target in the Bangong Lake_Nujiang metallogenic belt. |
| keywords:geology, ultrabasic-type nickel sulfide mineralization, carbonate-type nickel sulfide mineralization, Bangong Lake-Nujiang suture zone, Qinghai-Tibetan plateau |
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