摘要
对胶东金矿集中区成矿规律和地球物理信息的综合研究 ,提出了胶东地区可能存在一个规模较大的中生代地幔热柱—幔枝热构造。从区域构造背景出发 ,深入讨论了胶东地区的变质作用、岩浆作用、成矿作用的相互关系及其时空规律 ,初步建立了地幔热柱构造体系的壳 -幔成矿模式。
Comprehensive studies have revealed that there is an obvious and enormous thermal dome structure consisting of mantle plume mantle branch in the light of metallogenic regularity and geophysical information. This is a special tectonic unit that strides across two different tectonic settings:the southeast part of North China plate and part of Circum Pacific orogenic zone. The ultra crust faults(West Tanlu fault, Northeast Weihai Qinhuangdao fault and southeast Wulian Rongcheng fault)are distributed around the periphery of the mineralized area. At the center, Mesozoic volcanic rocks occur in Jiaolai basin; on the sides, there are metamorphic rocks and granite rocks, which are related to the mantle crust movement. The large and superlarge gold deposits are concentratedly distributed in the Linglong Kunyushan granite batholite or its contact zone; other silver deposits or ore spots are related to the crust mantle mixed source; Pb Zn deposits or ore spots have to do with intermediate acid granitic complexes and metamorphic rocks. Hence, the Au Ag and Pb Zn polymetallic series seem to be the ultimate evolutionary products of the hotspots in Mesozoic. In the whole evolutionary process, massive upwelling of mantle source substances and crust mantle interaction acted as a large gold silver polymetallic enrichment system. The enormous dome structure is the transferring system of ore materials, whereas magmatism and thermal fluid action make up the locations of ore deposits.
出处
《矿床地质》
CAS
CSCD
北大核心
2000年第1期26-36,共11页
Mineral Deposits
基金
国家自然科学基金项目!( 491 771 2 0 )
国家教委基金项目!( 3 951 -0 0 2 )
南京大学金属矿床成矿作用实验室资助成果
关键词
中生代
壳幔成矿作用
成矿模式
胶东地区
金矿床
Mesozoic, crust mantle mineralization, metallogenic model,gold mineralized area in east Shandong
