The Paleo-Tethys tectonic evolution and corresponding metallogenesis
The study of the Paleo-Tethys tectonic evolution and its mineralization are relatively weak.In this paper on the basis of defining the specific evolutionary stage and relative decelopmental spatial range of the Paleo-Tethys,from the perspective of regionanal mineralization,based on the late Paleozoic-early Mesozoic mineralization facts in the northern part and adjacent areas of the Qinghai-Tibet Plateau,it is proposed that the south and north branches of the Paleo-Tethys ocean,and the north branch between the Kangxiwa-Animqing-Mianlue suture belt and the Xijinwulan-Jinshajiang-Ganzi-Litang suture belt are the main ocean of the Paleo-Tethys.It substrate to the north low angle ocean-continent subduction of the Andean-like active continental margin,in the Animqing suture belt and Kunlun and west Qinling orogenic belt,forming a large number of endogenous metal deposits;to the south high angle ocean-ocean subduction,forming the Mariana-like trench-rac-basin system and the south branch of the Paleo-Tethys represented by the Longmuco-Shuanghu-suture belt between the south and north Qiangtang,which is the result of post arc expansion.According to the evolution model of the Paleo-Tethys tection cycle,the Paleo-Tethys mineralization is devided into two types:the major extensional and the major compressional tectional seyyings.The former is characterized by the output of early Devonian Xiarihamu super-large magmatic nickel-cobalt sulfide deposit,Devonian Xichenchangba super-large Sedex lead zinc deposit,late carboniferous Maorkansu largr sedimentary manganese deposit and early Permian Derni Cyprus VMS type copper-cobalt;the latter with numerous medium-small late Permian-Triassic porphyry-skarn type polymetallicdeposits,epithermal gold antimony deposits,VMS type polymetallic deposits,terrestrial volcanic rock type lead-zinc deposits output,especially Triassic magmatic hydrothermal gold deposits in the east Kunlun and west Qinling,and late Triassic Jiajika and Dahongliutan super-large pegmatite lithium-beryllium deposits exposed in the east and west ends of Bayanhar terrane.Large-scale mineralization event is the result of tectonic transformation,and the cracking event of the Paleo-Tethys tectonic cycle opening formed the Xiarihamu super large magmatic nickel-cobalt sulfide deposit;the closure of the Paleo-Tethys ocean and Indosinian orogeny of the continent-continent collision and post-collision created the development of the most important pegmatite lithium and other rare metal metallogemic belt in West Kunlun-Songpan Ganzi,China.It is urgent to strengthen the overall systematic research of tectonic evolution-magmatic activity-metallogenic response of the Paleo-Tethys,and serve the new round of prospecting breakthrough strategi action in the northern part of Qinghai-Tibet Plateau.
万方数据
维普
