caa a22 4500 445299797 CHVBK 20180317142553.0 cr unu---uuuuu 170323e20100701xx s 000 0 eng 10.1007/s11430-010-4004-1 doi (NATIONALLICENCE)springer-10.1007/s11430-010-4004-1 Constraints of (U-Th)/He ages on early Paleozoic tectonothermal evolution of the Tarim Basin, China [Elektronische Daten] [NanSheng Qiu, JiYang Wang, QingHua Mei, Guang Jiang, Cheng Tao] The thermal evolution of source rocks in the Paleozoic stratigraphic sequences has been an outstanding problem for petroleum exploration in the Tarim Basin, as the thermal history of the Paleozoic could not be reconstructed objectively due to the lack of effective thermal indicators in the early Paleozoic carbonate successions. The (U-Th)/He thermochronometry of apatite and zircon has recently been used as an effective tool to study the structural uplift and thermal history of sedimentary basins. The Paleozoic tectonothermal histories of two typical wells in the Tarim Basin were modeled using the thermal indicators of (U-Th)/He, apatite fission track (AFT), and vitrinite reflectance (R o) data in this paper. The Paleozoic strata in the two wells were shallow due to persistent uplift and significant erosion during the Hercynian tectonic events (from Devonian to Triassic). Therefore, the paleothermal indicators in the Paleozoic strata may retain the original thermal evolution and can be used to reconstruct the Paleozoic thermal history of the Tarim Basin. The apatite and zircon helium ages from core and cuttings samples were analyzed and the Paleozoic thermal histories of wells KQ1 and T1 were modeled by combining helium ages, AFT, and equivalence vitrinite reflectance (VR o) data. The modeling results show that the geothermal gradient evolution is different in the Kongquehe Slop and Bachu Uplift of Tarim Basin during the Paleozoic. The thermal gradient in Well T1 on the Bachu Uplift was only 28-30°C/km in Cambrian, and it increased to 30-33°C/km in Ordovician and 31-34°C/km during the Silurian and Devonian. The thermal gradient of Ordovician in Well KQ1 on the Kongquehe Slope was 35°C/km and decreased to 32-35°C/km during the Silurian and Devonian. Therefore, the combined use of (U-Th)/He ages and other thermal indicators appears to be useful in reconstructing the basin thermal history and provides new insight into the understanding of the early Paleozoic thermal history of the Tarim Basin. Science China Press and Springer-Verlag Berlin Heidelberg, 2010 (U-Th)/He ages nationallicence tectonothermal evolution nationallicence Tarim Basin nationallicence apatite fission track nationallicence equivalence vitrinite reflectance nationallicence Qiu NanSheng State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, 102249, Beijing, China aut Wang JiYang Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029, Beijing, China aut Mei QingHua State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, 102249, Beijing, China aut Jiang Guang State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, 102249, Beijing, China aut Tao Cheng Wuxi Research Institute of Petroleum Geology, SINOPEC, 214151, Wuxi, China aut Science China Earth Sciences SP Science China Press 53/7(2010-07-01), 964-976 1674-7313 53:7<964 2010 53 11430 https://doi.org/10.1007/s11430-010-4004-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11430-010-4004-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Qiu NanSheng State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, 102249, Beijing, China aut NATIONALLICENCE 700 1- Wang JiYang Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029, Beijing, China aut NATIONALLICENCE 700 1- Mei QingHua State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, 102249, Beijing, China aut NATIONALLICENCE 700 1- Jiang Guang State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, 102249, Beijing, China aut NATIONALLICENCE 700 1- Tao Cheng Wuxi Research Institute of Petroleum Geology, SINOPEC, 214151, Wuxi, China aut NATIONALLICENCE 773 0- Science China Earth Sciences SP Science China Press 53/7(2010-07-01), 964-976 1674-7313 53:7<964 2010 53 11430 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer