胶东地区“岩浆核杂岩”隆起-拆离带岩浆期后热液蚀变成矿
Hydrothermal Alteration Metallogenesis in the Determination Zone of a “Magmatic Core Complex” Upheaval-detachment Structure, Jiaodong

摘要： 胶东发育全球最大的与花岗岩有关的大型金矿。胶东金矿形成于板块拼合后的大陆，是地台中生代构造岩浆活化的地洼区,受控于“岩浆核杂岩”构造，而不是“变质核杂岩”构造。胶东“花岗核杂岩”(180～130 Ma)隆起，其外围是Ar—Pt变质岩地层(2500～1300 Ma)，更远处断陷盆地发育中生代地层(130～90 Ma)，总体围绕“岩浆核杂岩”呈穹窿带状分布。岩浆岩与变质岩之间、变质岩和沉积地层之间发育拆离断裂岩带。断裂带倾向背离“岩浆核杂岩”方向且呈铲式分布，显示拆离构造特征。花岗岩区断裂破碎岩带受岩浆期后热液的多次交代蚀变，在蚀变带及其次级断裂形成石英脉-蚀变岩金矿(120～100 Ma)。“岩浆核杂岩隆起-拆离带热液成矿”在中国复合大陆可能普遍发育。
Abstract: Jiaodong gold mine is one of the most largest gold deposits related with granites in the world. This paper points out that Jiaodong gold deposits formed in the inland after plate collison in Mesozoic, and that they belong to “Diwa”tectonic areas. The authors substitute a new concept of “magmatic core complex” for “metamorphic core complex”. There are the “magmatic core complex” in Jiaodong, which posses granite core (180-130 Ma), metamorphic wall-rock (2,500-1,300 Ma)and their lid of volcanic sedimentary basin. Shear zones are located among the granites, metamorphics and sedimentary beds; the shear zones between the granite core and the metamorphic wall rocks return into the detachment fault with wide toughness-brittleness cataclastic rocks at the side of granites; therefore, the Jiaodong gold deposits of phyllic alteration form by the post-magmatic hydrothermal liquid in fault cataclastic rocks(120-100 Ma). The Jiaodong “magmatic core complex”structure perhaps is a common geologic phenomenon at actic Mesozoic in China