Magnetic Characteristics Of Late Cenzoic Rock Of Heiziwei Section And Its Response To Tectonic Uplift Of Peripheral Mountains In Traim Basin

Since the late Oligocene, China Tarim Basin, due to convergence of Indo-European plate collision effects arising from disruption of connectivity with the ancient Mediterranean, entered the land basin sedimentary environments, basin widely distributed in the Tertiary strata, and contains the a lot of salt minerals and oil and gas resources. Tarim basin is composite basin from different times and different types of single basin overlay in different periods of depression, location often migrated or even reverse, Structural pattern is complex,because it is the role of erosion and transformation by many period tectonic activity. Predecessors have conducted extensive research. Tarim basin structural framework, development and tectonic activity to obtain profiles rich results, but for late Cenozoic regional tectonic activity of a detailed study of relatively weak. Although the main oil and gas resources in the Tarim Basin formation in the Cenozoic before, However, mainly its final destruction, alteration, restructuring and save by Cenozoic, in particular, since late Cenozoic tectonic activity controlled. Tarim Basin since the Late Cenozoic tectonic activity often closely associated with the Tibetan Plateau uplift. So research Cenozoic sedimentary strata of the Tarim its development with the changes of tectonic activity, it is important things,both for geology and oil and gas resources to master the enrichment, storage rule, or the scientific understanding of the Tibetan Plateau uplift.Based on the former research findings, Kashigar depression of Western Tarim Basin was chosen as the object of study, which is located in the junction area of three major continent tectonic units among Western Tarim Basin,southern Tianshan mountain and western Kunlun. By comprehensive analysis of rock magnetic characteristics of late Cenozonic sediment of Heiziwei outcrop section, in combination with study of lithological association and change of paleocurrent analysis and congener, five tectonic activity events were found in this area, and they occurred from the end of the Oligocene to the beginning of the Miocene, in early of middle Miocene,the beginning of Late Miocene,the end of Late Miocene to early Plicene and Late Plicene to Pleistocene, respectively. Among them, the tectonic activities of the Oligocene to the beginning of the Miocene and Late Plicene to Pleistocene are the two major events, they also have relations with Tibet Plateau uplift, the former cause intense uplift of southern Tianshan mountain and Kunlun mountain, in which terminate the link between Western Tarim Basin and Paleo-Mediterranean entering evolution stage of continental basin. the later further cause intense uplift of Tianshan mountain and Kunlun mountain, intensely reduce the crust between the Pamir and Tianshan mountain and form present pattern of physiognomy in this area.