摘要
根据盆地基底性质、地层层序结构、沉积组合特征、盆地性质等,将西北地区残余侏罗纪含煤盆地划分为9个盆地类型区。通过对侏罗系火山岩、早燕山期碱性花岗岩类、侏罗纪盆地的伸展构造及正反转构造和侏罗纪的古地温梯度的系统研究,对西北地区早中侏罗世含煤盆地的构造性质进行了讨论,明确提出早中侏罗世西北地区整体处于一种地壳伸展的构造背景。最后讨论了西北地区侏罗纪盆地形成的区域构造背景,并提出西北地区侏罗纪盆地的形成演化受控于中国西部侏罗纪特提斯洋盆的张开与闭合。
Based on the basal nature of basi n, stratigraphic sequence and texture, sed imentary compose feature, nature of basin a nd so forth differences, divided Jurassic c oal basins of North-western China region in to 9 types.Through systematic research on v olcanic rocks of Jurassic system,evisite o f early Yenshan stage,Stretch structure an d rotation structure in Jurassic basin,and ancient geothermal gradient of Jurassic Pe riod,the structural nature of early-middle Jurassic coal basin of north-western China region was discussed, and considered clear ly that North-western China region during e arly-middle Jurassic Epoch located on the s tructural background of crust stretch. Ear ly-middle Jurassic basin in the region of I nner Mongolia, Gansu and Qinghai located in the east of Minfeng-cherchen river fractur e, mainly belongs to the type of dustpan lik e faulting basin on the background of stret ch structure, and the Jurassic basin in the Northern Xinjiang region belongs to the bas in similar to Kraton and mainly depression. Finally, the paper has discussed the formi ng regional structural background of Juras sic basin in North-western China region, an d considered there are close relation with Tethys ocean in Western China during Jurass ic Period.
出处
《中国煤田地质》
2002年第4期6-8,30,共4页
Coal Geology of China
关键词
构造性质
构造类型
含煤盆地
侏罗纪
西北地区
地层层序
structural nature
structural t ype
coal basin
Jurassic Period
North-we stern China region
