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天山—阿尔泰东部地区是中国重要的铜镍成矿区,近年来针对区内的铜镍矿床和相关岩体的研究不断取得进展,找矿也取得了一系列新突破,已经探明了十几个矿床和矿点。笔者基于以往研究成果,结合目前地质勘查和找矿评价的新进展,比较详细地全面总结了后碰撞铜镍硫化物矿床的基本特点、成矿规律和成矿过程,并建立了描述性成矿模型。这些矿床沿一组平行的走向近东西的深大断裂分布,与成矿有关的镁铁质—超镁铁质杂岩体一般不大于5km2,小的可为一个岩墙。矿化分两种类型:通道型和熔离型。成矿时代为298~270Ma,为中亚成矿带大规模成矿期的组成部分,形成于后碰撞伸展阶段。与这组铜镍硫化物矿床有关的镁铁质—超镁铁质杂岩体可能是早二叠世大面积喷溢岩浆的残留根部或通道部分,可能与地幔柱活动有关。另外,针对区内的地质特征,结合以往找矿的成功经验,对区内进一步的找矿工作提出了一些设想和建议。
The Tianshan-Altai east region is an important copper-nickel metallogenic region in China. In recent years, the research on copper-nickel deposits and related rock mass in the area has made continuous progress and a series of new breakthroughs have been made in prospecting. A dozen Deposit and mine point. Based on the previous research results and the new progress of the current geological prospecting and prospecting evaluation, the author comprehensively summarized the basic characteristics, metallogenic regularity and metallogenic process of the post-impact Cu-Ni sulfide deposit in detail and established descriptive mineralization model. These deposits are distributed along a series of deep faults near to the east and west. The mafic-ultramafic complex associated with metallogenesis is generally not larger than 5 km 2 in size and smaller for a dyke. Mineralization is divided into two types: channel-type and melt-off type. The mineralization age is 298 ~ 270Ma, which is a component of the large-scale metallogenic epoch of Central Asia metallogenic belt formed during the post-collision extension. The mafic-ultramafic complex associated with this group of Cu-Ni sulfide deposits may be part of the residual root or channel of the large-area bubbly magma in the Early Permian and may be related to mantle plume activity. In addition, aiming at the geological features in the area and combining with the successful experience of prospecting in the past, some suggestions and suggestions for further prospecting in the area are put forward.