青海杂多地区新生代构造特征与两种类型矿床的关系

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篇　名 青海杂多地区新生代构造特征与两种类型矿床的关系
並列篇名 Structural Characteristics of Cenozoic Strata and Relationship between Two Types of Ore Deposits in Zaduo Area, Southern Qinghai
作　者 王召林(Zhao-Lin Wang);侯增谦(Zeng-Qian Hou);杨竹森(Zhu-Sen Yang);田世洪(Shi-Hong Tian);刘英超(Ying-Chao Liu);杨志明(Zhi-Ming Yang);宋玉财(Yu-Cai Song);刘焰(Yan Liu);张洪瑞(Hong-Rui Zhang);王猛(Meng Wang);鲁海峰(Hai-Feng Lu)
刊　名 礦床地質
卷期／出版年月 28卷2期(2009/04)
頁次 157-169
資料語文 中文
摘要 青海南部存在着巨大的成矿潜力，研究该区的构造变形与成矿作用的关系，对于认识区内众多矿床（化）的构造背景和控矿要素具有重要意义。新生代的走滑断裂和逆冲推覆构造是大陆碰撞造山带成矿理论中晚碰撞阶段在青藏高原东、北缘的重要构造形式。走滑断裂呈北西向，控制着藏东一系列走滑拉分盆地和斑岩的产出；逆冲推覆构造走向北西，整体自南向北呈现很好的分带特征，可分为根带、中带和前锋带。研究区存在两种类型矿床，分别为走滑断裂控制的斑岩型矿床和逆冲推覆构造控制的热液型矿床。其中，切过地壳尺度的走滑断裂因减压作用导致含水地幔的部分熔融，进而导致富含挥发分的含矿斑岩上涌、侵位，形成纳日贡玛斑岩型钼（铜）矿；逆冲推覆作用是流体长距离迁移的动力来源，逆冲推覆构造前锋带的逆冲断层上（下）盘破碎带或次级断层附近是成矿流体迁移的疏导系统和金属汇聚、淀积的重要场所。
Great ore-prospecting potential exists in southern Qinghai, and this study aims at clarifying ore-forming tectonic settings and ore-control characteristics of this area. Cenozoic strike-slip and thrust faults constitute significant characteristics of late collision settings of the continental collitional orogenic belt in eastern and northern margins of Tibet plateau. The pull-apart basins and porphyry in eastern Tibet are controlled by the NW-striking strike-slip fault, and the thrust faults can be divided into three types based on their deformation styles from north to south, i.e., root belt, middle belt and front belt. There exist two types of ore deposits, namely strike-slip-controlled porphyry Mo (Cu) deposits and thrust-controlled hydrothermal deposits. The decompression effect of strike-slip faults cutting through the crust might have caused partial melting in the water-bearing mantle, and resulted in the upwelling and emplacement of volatiles-rich ore-bearing porphyry and the formation of the Narigongma porphyry molybdenum (copper) deposit.. As the driving force of hydrothermal migration, thrust structures formed fracture belts and second-order faults on the footwall or hanging wall in the front belt, which made up a significant transporting system for ore-forming fluids as well as the space for ore accumulation.

關鍵詞 地质学,构造控矿,走滑断裂,逆冲推覆构造,斑岩型矿床,铅锌银矿床,青藏高原;geology,structural control,strike-slip fault,thrust nappe system,porphyry deposit,Pb-Zn-Ag deposit,Tibetan plateau

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