核杂岩
1.CHARACTERISTICS OF FANGSHAN METAMORPHIC CORE COMPLEX,BEIJING AND A DISCUSSION ABOUT ITS ORIGIN
2.Results The tectonic characteristics and evolution of the Xiaoqinling area do not fit those of typical MCC.
3.Methods A contrast is made between the characteristics of typical MCC and the Taihua Complex in the Xiaoqinling based on investigation and analysis of structural evolution of the Xiaoqinling.
4.The paper gives a mechanical and history analysis on the characteristic of Laojunshan metamorphic core complex in southeastern Yunnan and its structural environment, and considers that metamorphic core complex is actually a nuclear column of a vortex structure, which was caused by the Wenshan—Malipo strike-slip fault.
5.i) The metallotectonicses of Xitieshan Pb-Zn deposit in Qinghai Province have been demonstrated to belong to extensional metallotectonic series in ductile domain, and the Pb-Zn ore veins are controlled by the marble tectonic lens in the folding layers of metamorphic core complexes formed in Caledonian.
6.Mesozoic mantle plume is the deep mechanism of the ultra-metamorphism, metamorphic core complexes, gold mineralization. It is basic reasons for the north China platform activation in Mesozoic Era.
7.GEOTECTONIC FEATURES OF THE COMPLEX IN THE METAMORPHOSED CORE OF THE NALATI TECTONIC ZONE IN WESTERN TIANSHAN,SINKIANG
8.The complex in the metamorphosed core of the Nalati tectonic zone in the western Tianshan,Sinkiang,occurs in the north side of Nalati mountain ridge in Gonglu County,Sinkiang.Distributed at east-west direction,it consists of a high-grade metamorphosed gneissic complex and represents a huge boundary faulted zone of sutured plates,showing the characteristics of subducting structure-ophiolite mélange features.
