羌塘中生代盆地演化特征  

Evolution Characteristics of the Qiangtang Basin in the Mesozoic Era

作　　者：南征兵[1] 张艳玲[2] 李永铁[1] 谭富文[3] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国地质环境监测院,北京100081 [3]成都地质矿产研究所,四川成都610082

出　　处：《天然气地球科学》2013年第3期534-540,共7页Natural Gas Geoscience

摘　　要：羌塘盆地位于特提斯构造域的东段,分布在羌塘—昌都地块中西部,夹持于可可西里—金沙江与班公湖—怒江2条缝合带之间,包括中央隆起带在内残留面积约为18×104km2,是青藏高原上面积最大的中生代海相残留盆地,勘探前景乐观。对于中生代时期羌塘盆地在特提斯域中的位置和盆地的性质,存在不同认识,综合分析后认为:羌塘盆地中生代属于劳亚大陆南缘,为一个典型的叠合盆地,先后经历了北羌塘前陆盆地演化阶段、羌南裂谷阶段、被动陆缘裂陷阶段、被动陆缘拗陷阶段和羌塘盆地萎缩阶段等5个演化阶段。Qiangtang Basin is located in the east of Thethys structural domain,in the middle-west part of the Qiangtang-Changdu crustal block,between the two suture zones of Kokoxili-Jiangshajiang and the Bangon- ghu Nujiang. Its area is about 18× 104km2 including central uplift belt. It＇s the biggest Mesozoic marine re- sidual basin in the Qinghai-Tibet Plateau, and has great exploration potential. There are different ideas a- bout the location in Thethys structural domain in Mesozoic and the basinrs character. Based on comprehen- sive analysis, this study concludes that the basin is located in the south margin of the Laoya continent,and is a typical superimposed basin. It has undergone 5 evolutionary phases,including foreland basin of north Qiangtang,rift of south Qiangtang, passive margin rift stage, passive margin depression stage and fade phase.

关 键 词：构造演化 特提斯构造域 盆地性质 叠合盆地 中生代 羌塘盆地 

分 类 号：TE121.1[石油与天然气工程—油气勘探]