西藏班公湖—怒江成矿带研究进展及一些新认识

  • 宋扬 ,
  • 唐菊兴 ,
  • 曲晓明 ,
  • 王登红 ,
  • 辛洪波 ,
  • 杨超 ,
  • 林彬 ,
  • 范淑芳
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  • 中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点实验室,北京 100037

作者简介:宋扬(1983-),男,新疆乌鲁木齐人,助理研究员,主要从事矿产勘查和区域成矿规律研究. E-mail: songyang100@126.com

网络出版日期: 2014-07-10

基金资助

国家重点基础研究发展计划项目“青藏高原南部增生造山成矿系统发育机制”(编号:2011CB403103);中国地质调查局项目“我国重要矿产和区域成矿规律研究”(编号:1212010633903)资助

版权

, 2014,

Metallogenic Belt and Some New Recognition

  • Yang Song ,
  • Juxing Tang ,
  • Xiaoming Qu ,
  • Denghong Wang ,
  • Hongbo Xin ,
  • Chao Yang ,
  • Bin Lin ,
  • Shufang Fan
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  • MLR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,CAGS,Beijing 100037,China

Online published: 2014-07-10

Copyright

Advance in Earth Sciences Editorial, 2014, This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

摘要

狭义的班公湖—怒江成矿带的范围与班公湖—怒江洋盆残留的蛇绿混杂岩带一致,包括与超基性岩浆熔离作用相关的Cr,Fe,Ni等矿床;广义的班公湖—怒江成矿带包括缝合线南北两侧与班公湖—怒江洋俯冲、碰撞、碰撞后及陆内伸展作用有关的所有矿床和岩浆岩,其范围包括南羌塘地体南缘、班公湖—怒江缝合带、北—中拉萨地块的大部分区域,发育的矿床类型有斑岩型铜(金)矿、矽卡岩型铁(铜)矿、热液—蚀变岩型金矿和热液型钨矿等,涉及的动力学背景包括活动大陆边缘到板内的各个阶段。在2期重要的斑岩铜(金)成矿作用中,120~105 Ma BP矿床的形成与拉萨地体和南羌塘地体碰撞过程中深部俯冲洋壳物质的重熔有关,90~85 Ma BP矿床始于碰撞后阶段岩石圈地幔的底侵作用。一些关键的基础性科学问题,诸如大地构造背景(成矿环境)、岩浆作用特征、典型矿床成矿机制、矿床的保存与高原隆升之间的关系等,需要在今后的研究工作中予以关注。

本文引用格式

宋扬 , 唐菊兴 , 曲晓明 , 王登红 , 辛洪波 , 杨超 , 林彬 , 范淑芳 . 西藏班公湖—怒江成矿带研究进展及一些新认识[J]. 地球科学进展, 2014 , 29(7) : 795 -809 . DOI: 10.11867/j.issn.1001-8166.2014.07.0795

Abstract

The traditional Bangongco-Nujiang metallogenic belt overlap with the ophiolitic melange units remained in the Bangongco-Nujiang ocean including the Cr, Au, Fe mineralization controlled with magma liquation. On the other hand, the broad metallogenic belt involved the deposits which had been recognized the products of subduction or postsubduction lithospheric extension in the northern and southern sides of Bangongco-Nujiang subduction zone, which includes the southern edge of the southern Qiangtang, suture zone, part of the North and Middle Gangdese block. The types of deposits include porphyry copper (gold) deposits, skarn iron (copper) deposits, hydrothermal-altered rock type of gold deposits and hydrothermal type of tungsten deposits throughout the evolution of Bangongco-Nujiang ocean. The copper mineralization has two episodes at about 120~105 Ma and 90~85 Ma, respectively. The early stage of copper mineralization (120~105 Ma) likely formes by remelting of previously subduction-modified arc lithosphere. Moreover, the late stage of copper mineralization (90~85 Ma) could be triggered by postcollisional lithospheric mantle delamination. Some of key fundamental scientific problems, such as Tectonic background (metallogenic environment), magmatism, metallogenic mechanism of typical deposits, the relationship between the preservation and plateau uplift, we need to pay attention to in the future work.

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