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.

Key words: Jiaodong gold deposit, magmatic core complex, detachment zone, hydrothermal alteration deposit