The Ordos Basin(OB)in the western part of the North China Craton(NCC),was located at the jointed area of multi-plates and has recorded the Mesozoic tectonic characteristics.Its tectonic evolution in the Mesozoic is si...The Ordos Basin(OB)in the western part of the North China Craton(NCC),was located at the jointed area of multi-plates and has recorded the Mesozoic tectonic characteristics.Its tectonic evolution in the Mesozoic is significant to understand the tectonic transformation of the northern margin of the NCC.In this work,the detrital zircon and apatite(U-Th)/He chronological system were analyzed in the northern part of the OB,and have provided new evidence for the regional tectonic evolution.The(U-Th)/He chronological data states the weighted ages of 240‒235 Ma,141 Ma with the peak distribution of 244 Ma,219 Ma,173 Ma,147‒132 Ma.The thermal evolution,geochronological data,and regional unconformities have proved four stages of regional tectonic evolution for the OB and its surroundings in the Mesozoic:(1)The Late Permian-Early Triassic;(2)the Late Triassic-Early Jurassic;(3)the Late Jurassic-Early Cretaceous;(4)the Late Cretaceous-Early Paleogene.It is indicated that the multi-directional convergence from the surrounding tectonic units has controlled the Mesozoic tectonic evolution of the OB.Four-stage tectonic evolution reflected the activation or end of different plate movements and provided new time constraints for the regional tectonic evolution of the NCC in the Mesozoic.展开更多
柴达木盆地位于青藏高原东北部,处于祁连山脉、阿尔金山脉、昆仑山脉之间,盆地面积约12.1×10^(4)km^(2),盆地海拔2600~3000 m,是一个中新生代大型内陆山间盆地(Yin An et al.,2008;王大华等,2015)。本文研究区位于柴达木盆地北缘(...柴达木盆地位于青藏高原东北部,处于祁连山脉、阿尔金山脉、昆仑山脉之间,盆地面积约12.1×10^(4)km^(2),盆地海拔2600~3000 m,是一个中新生代大型内陆山间盆地(Yin An et al.,2008;王大华等,2015)。本文研究区位于柴达木盆地北缘(柴北缘)中段(图1),该区二三维地震资料密集,基本上覆盖全区。自中生代以来,柴北缘经历了多期次的构造演化,前人也对此开展了大量研究工作,目前,关于中生代盆地性质是拉张还是挤压以及古近纪开始系伸展还是挤压背景尚存争议。展开更多
基金This study was jointly supported by the Science&Technology Fundamental Resources Investigation Program(2022FY101800)National Science Foundation(92162212)+1 种基金the project from the Key Laboratory of Tectonics and Petroleum Resources(China University of Geosciences,Wuhan)(TPR-2022-22)the International Geoscience Programme(IGCP-675)。
文摘The Ordos Basin(OB)in the western part of the North China Craton(NCC),was located at the jointed area of multi-plates and has recorded the Mesozoic tectonic characteristics.Its tectonic evolution in the Mesozoic is significant to understand the tectonic transformation of the northern margin of the NCC.In this work,the detrital zircon and apatite(U-Th)/He chronological system were analyzed in the northern part of the OB,and have provided new evidence for the regional tectonic evolution.The(U-Th)/He chronological data states the weighted ages of 240‒235 Ma,141 Ma with the peak distribution of 244 Ma,219 Ma,173 Ma,147‒132 Ma.The thermal evolution,geochronological data,and regional unconformities have proved four stages of regional tectonic evolution for the OB and its surroundings in the Mesozoic:(1)The Late Permian-Early Triassic;(2)the Late Triassic-Early Jurassic;(3)the Late Jurassic-Early Cretaceous;(4)the Late Cretaceous-Early Paleogene.It is indicated that the multi-directional convergence from the surrounding tectonic units has controlled the Mesozoic tectonic evolution of the OB.Four-stage tectonic evolution reflected the activation or end of different plate movements and provided new time constraints for the regional tectonic evolution of the NCC in the Mesozoic.
文摘柴达木盆地位于青藏高原东北部,处于祁连山脉、阿尔金山脉、昆仑山脉之间,盆地面积约12.1×10^(4)km^(2),盆地海拔2600~3000 m,是一个中新生代大型内陆山间盆地(Yin An et al.,2008;王大华等,2015)。本文研究区位于柴达木盆地北缘(柴北缘)中段(图1),该区二三维地震资料密集,基本上覆盖全区。自中生代以来,柴北缘经历了多期次的构造演化,前人也对此开展了大量研究工作,目前,关于中生代盆地性质是拉张还是挤压以及古近纪开始系伸展还是挤压背景尚存争议。
