The Magmatic Thermal Activity And Thrust Systems In Nima-Rongma Corridor Zone In Qiangtang,Tibet

Qiangtang Basin is the largest Mesozoic marine basin with oil and gas in China,in which is most expected to make a breakthrough in oil-gas exploration.However,lack of the understanding and researching about the basin evolution,tectonic features and gas preservation conditions,restricts the qiangtang exploration of oil and gas resources.By researching the magmatic thermal activity and thrust systems in Nima-Rongma zone,This article want to analyze the tectonic evolution background of Qiangtang and characteristics,types,mechanism of the thrust systems.In addition,do some research about thrust systems is a big help for Nima-Rongma zone.The thrust systems and magmatic activity can be combined with Shuanghu,Lupola basin,which provide more comprehensive reference for oil and gas resources evaluation.Through field geological survey,test and analysis,combining previous research and deep tectonics,this article has made the following understandings:1、From the north to the south,there are lots of thrust systems in Nima-Rongma Zone,inclouding the thrust systems around the middle Qiangtang thrust systems,South Qiangtang thrust systems,Bangong-Nujiang Suture zone thrust systems and North Lhasa thrust systems.2、The thrust systems activity from the Late Cretaceous-Oligocene,and stop before Oligocene-Early Miocent.The thrust systems activity time become young gradually from the north to south,indicating the advancing thrust.The active time of thrust fault and regional uplift have good corresponding for the evolution of the Bangong-Nujiang oceanic and Neo-tethys and subsequent collision orogenic process.3、The North Qiangtang thrust systems go through the Central Qiangtang Uplift,and enter into the South Qiangtng.The thrust systems cut deep between two different blocks,however,the thrust system cut shallow in the same blocks,and formed the thin-skinned nappe structure.4、The chronology and petrology of Jiangaidarina and Maryigangri Granite indicate the Qiangtang basin experienced the compressive stress from the south to north in Late Triassic,and then,the Qiangtang Basin experienced stable inter-continental rift stage,accepting the Mesozoic marine sedimentary;XiabieCo Granite indicate the Bangong-Nujiang Suture closured in the Early Cretaceous5、Combines with the oil and gas geological conditions and the influence of thrust systems,RiganpeiCo area and South Nima Basin are better oil rsources;and the Huangxiaob area maybe good gas resources of area.While the North Nima Basin should not the lack of a better trap conditions,...