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中国东北部陆缘内生金矿床成因类型、成矿时代及地球动力学背景
  • ISSN号:1671-5888
  • 期刊名称:《吉林大学学报:地球科学版》
  • 时间:0
  • 分类:P578.1[天文地球—矿物学;天文地球—地质学] P541[天文地球—构造地质学;天文地球—地质学]
  • 作者机构:[1]吉林大学地球科学学院,长春130061, [2]中国地质科学院矿产资源研究所,北京100037, [3]吉林大学学报编辑部,长春130026
  • 相关基金:国家自然科学基金项目(40772052,41172072); 中国地质调查计划项目(资[2010]矿评01-26-06); 中国地质调查局地质调查工作项目(1212011220936)
中文摘要:

中国东北部陆缘是我国内生金矿床较为发育的地区之一,以成矿作用复杂、蕴藏丰富的金资源量倍受国内外地质学家关注。通过对该区内生金矿的地质和成矿年代的系统研究,初步将该区内生金矿床划分为中温热液金矿床、接触交代-热液金矿床、斑岩型/类斑岩型金铜矿床和浅成低温热液金矿床4种主要成因类型和3个重要成矿期(170~160 Ma、130~110 Ma和110~90 Ma)。结合同位素地球化学特征,进一步确定中温热液金矿床的成矿物质主要来自下地壳源,成矿作用与中生代燕山早期古太平洋板块俯冲作用引发的中国东部大陆边缘岩石圈减薄及拆沉的动力学过程密切相关;接触交代-热液金矿床的成矿物质来源于年轻地壳,成矿作用与古太平洋板块俯冲引起的岩石圈减薄拆沉的伸展构造背景下的岩浆接触交代作用更为密切;而斑岩型/类斑岩型金铜矿床和浅成低温热液金矿床的成矿物质来源为壳幔混合源,其成矿发生在古太平洋板块向亚洲大陆正北向俯冲转入Izanagi-Farallon板块西向俯冲的构造转换期。

英文摘要:

Numberous endogenetic gold deposits are found in the epicontinental region in Northeast China,and they have attracted more attention and research efforts from both domestic and international economic geologists.These deposits are featured by the characteristic of complex and obviously multistage mineralization.Based on systematic study on geological features and metallogenic epoch of these endogenetic gold deposits in the area,the present paper has divided the gold deposits into four main types: mesothermal,contact-metamorphic,porphyry gold-copper and epithermal gold deposits.They were formed in three important ore-forming epochs at 170-160 Ma,130-110 Ma and 110-90 Ma.Based on isotope geochemistry,we concluded that that the metallogenic material of the mesothermal gold deposit was derived from the lower crustal source and its mineralization was closely related to lithospheric thinning and delamination of the continental margin,a processes triggered by the subduction of the Paleo-Pacific plate in the Early Mesozoic Yanshanian orogeny.The metallogenic material of the contact-metamorphic gold deposit was derived from the younger crust and the mineralization was relevant to contact metasomatism of magmatic process under extensional setting of the lithospheric thinning and delamination,which caused by the subduction of Paleo-Pacific plate.However,metallogenic material of porphyry gold-copper deposit and epithermal gold deposit manifested as crust-mantle mixture.Their mineralization occurred in the tectonic transition period from Asian continent subducted by the Paleo-Pacific plate towards the due north to the Izanagi-Farallon plate subduction toward west.

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期刊信息
  • 《吉林大学学报:地球科学版》
  • 中国科技核心期刊
  • 主管单位:中华人民共和国教育部
  • 主办单位:吉林大学
  • 主编:林学钰
  • 地址:长春市西民主大街938号
  • 邮编:130026
  • 邮箱:jdxbdxb@jlu.edu.cn
  • 电话:0431-88502374
  • 国际标准刊号:ISSN:1671-5888
  • 国内统一刊号:ISSN:22-1343/P
  • 邮发代号:12-22
  • 获奖情况:
  • 国内外数据库收录:
  • 美国化学文摘(网络版),荷兰文摘与引文数据库,美国地质文献预评数据库,美国剑桥科学文摘,英国动物学记录,美国石油文摘,中国中国科技核心期刊,中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版)
  • 被引量:17208