岩浆通道成矿核心内涵“两深一浅一通道”及其找矿意义
DOI:
作者:
作者单位:

中国科学院地球化学研究所

作者简介:

通讯作者:

中图分类号:

基金项目:

(编号:42330807, 42121003)资助的研究成果


The core connotation of magma conduit model “two deep, one shallow and single channel” and its significances on exploration
Author:
Affiliation:

State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    内容提要:岩浆通道成矿模型的建立深刻改变了岩浆铜镍硫化物矿床成因研究的范式,成为该领域的研究前沿,而且已经成功地应用于找矿勘查中。该模型揭示了硫化物熔离与聚集成矿在空间上的不一致性以及成矿与相关玄武岩铂族元素强烈亏损的成因联系,很好地解释了为什么很多含矿岩体围岩贫硫化物。笔者将该模型的核心内涵概括为“两深一浅一通道”,“两深”指成矿物质来源于地幔、硫化物熔离发生在深部,“一浅”指硫化物的聚集成矿主要发生在较浅的岩浆房,“一通道”指较稳定的岩浆通道更有利于成大矿。结合对典型矿床和成矿带的分析,笔者提出侵位较浅的、规模相对较大的岩体,其成矿潜力好于深部的岩浆通道相。因此,认为地表矿化并不是唯一可靠的、甚至不能作为最重要的找矿标志,要提高找矿效率(特别是隐伏矿床),首先要全面分析成矿带岩浆通道系统在不同区域的埋藏、剥蚀和暴露状况、目标岩体地质产状及其与围岩时代差异等宏观地质要素,查明深部通道相与浅部岩体空间分布和形成深度的差异,在此基础上,判断浅部岩体的位置、合理部署重点勘查区域、选择有效的勘查技术、定位目标岩体,进行钻探验证。

    Abstract:

    Abstract: Magma conduit model has profoundly changed the research paradigm of the formation of magmatic Ni-Cu sulfide deposits. It has become one of the frontiers in this area and successfully applied in prospecting. This model reveals the discordance between segregation and accumulation of sulfide liquids and genetic linkage between the formation of the deposit and depletion of platinum-group element in the related basalts. It gives an interpretation very well to why the wall rocks of the mineralized intrusion are always sulfide-poor. The core connotation of the magma conduit model is summed up as “two deep, one shallow and single channel” in this paper. The “two deep” refers to that metallogenic materials come from the mantle and the sulfide segregation from magma takes place at depths. The “one shallow” refers to accumulation the sulfide liquids at relatively shallow depths. The “single channel” means that a positionally stable magma conduit is more beneficial to the formation of large ore deposit. Combining with the analysis of classic deposits and metallogenic belts, it is concluded that the relatively large intrusions emplaced in shallower depths have better mineralization potentiality than the channel facies at deep levels. Thus, mineralization at the surface is not the only reliable and not even indicative clue for prospecting. What are important to improve the efficiency of prospecting, especially for blind ore deposit, are to find out burial and exposure status of the magma conduit system in different positions of a metallogenic belt, to make clear features and distribution and original depth of the magma channel in deep levels and shallow intrusions, and then to select key areas as well as effective exploration techniques, to find intrusions of prospecting drilling programs.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2024-03-21
  • 最后修改日期:2024-05-01
  • 录用日期:2024-05-20
  • 在线发布日期:
  • 出版日期: