摘要
五台—恒山地区是Au的低背景区,但五台群变火山岩在成岩、变质和风化—再沉积过程中曾发生过3次活化再分配,其中由区域变质导致的Au矿化形成了工业矿床。该区与中生代过渡同熔型花岗岩类有关的金矿床与区域变质热液金矿具有明显的地质—地球化学差异,显示出金矿化的规模和强度与花岗岩体的Au丰度呈正消长关系,该类矿床中的Au来源于被重熔或被同熔的下地壳—上地幔分布不均匀的Au及重金属硫化物聚集体。
Wutai-Hengshan region is a low content abundance region of gold. But gold in the metavolcanite in Wutai group had activated and redistributed three times during the process of diagenetic, metamorphic and weathering-resediment. Regional metamorphism resulting in gold activation forms industrial mineral deposit. There are obvious geology-geochemistry differentiation between gold deposit related to granitoid of transitional syntectic type in Mesozoic era and hydrothermal gold deposit of regional metamorphism in the region. So they show direct growth and decline of the relations between the scale and the intensity of gold mineralization and the gold abundance of granite body. The gold in the deposits originated from gathering body of gold and heavy metal sulphide that are related or syntected and unevenly distributed in the lower crust and upper mantle.
出处
《地质与勘探》
CAS
CSCD
北大核心
2000年第1期3-5,19,共4页
Geology and Exploration
