关键词: 塔西南山前, 生长地层, 变形时代, 磁性地层, 晚新生代

Abstract: The detailed research of outcrops and 2D seismic profiles of the western Tarim Basin indicate that there are growth strata and growth unconformity along the northern front belt of Pamir-western Kunlun and the southern front belt of southwest Tianshan.By identifying the exact layer of growth strata and growth unconformity and applying the magnetostratigraphic data,it is found that the time of main tectonic deformation was within 1.07 million years before present at Atushi anticline and Kashi anticline on the southern front belt of southwest Tianshan,and it was the late Pleistocene at Wupoer Fault on the north flank of Pamir.On the north flank of western Kunlun,the deformation of Sugaite anticline started in Pliocene(about 4.0 million years before present).Yingjisha anticline started in the late Pleistocene.Aketao anticline started in the end of the late Pleistocene,and Kekeya anticline and Guman anticline started in the late Pliocene-early Pleistocene(from 2.14 to 1.8 million years before present).Hence,it is deduced that the tectonic deformation mainly took place from the Pliocene to the Quaternarg along the front belts of Pamir-western Kunlun-southwest Tianshan in China.

Key words: front belts of Pamir-western Kunlun-southwest Tianshan, growth strata, deformation time, magnetostratigraphy formation, late Cenozoic