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

作　　者：吕古贤[1,2,3] 李洪奎 丁正江[3] 韩方法 李勃辉 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]长安大学地球科学与资源学院,陕西西安710054 [3]中国地质大学(北京)地球科学与资源学院,北京100083 [4]山东省地质科学实验研究院,山东济南250013 [5]山东省第六地质矿产勘查院,山东威海264209

出　　处：《现代地质》2016年第2期247-262,共16页Geoscience

基　　金：国家自然科学基金项目(40972061);山东省国土资源厅项目(鲁地调合[2012]33号)

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”（180～130Ma）隆起,其外围是Ar-Pt变质岩地层（2500～1300Ma）,更远处断陷盆地发育中生代地层（130～90Ma）,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（120～100Ma）.“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.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 “meta-morphic core complex”.There are the “magmatic core complex”in Jiaodong ,which posses granite core (1 80-1 30 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-magmat-ic hydrothermal liquid in fault cataclastic rocks(1 20 -1 00 Ma).The Jiaodong “magmatic core complex”struc-ture perhaps is a common geologic phenomenon at actic Mesozoic in China.

关 键 词：胶东金矿 岩浆核杂岩 拆离带 热液蚀变矿床 

分 类 号：P54[天文地球—构造地质学] P618.5[天文地球—地质学]