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Regional Exhumation and Tectonic History of the Shanxi Rift and Taihangshan, North China
Tectonics ( IF 4.2 ) Pub Date : 2021-01-21 , DOI: 10.1029/2020tc006416
Christopher Clinkscales 1 , Paul Kapp 1 , Stuart Thomson 1 , Houqi Wang 2 , Andrew Laskowski 3 , Devon A. Orme 3 , Alex Pullen 4
Affiliation  

This study presents a comprehensive low‐temperature thermochronometric dataset from the Shanxi Rift, Taihangshan, and eastern Ordos block in North China, including new apatite fission track and apatite (U‐Th‐Sm)/He data and published apatite and zircon fission track and (U‐Th‐Sm)/He data. We use these data and new thermal history inversion models to reveal that the Shanxi Rift and Taihangshan experienced an increase in cooling rates between ca. 110–70 Ma and ca. 50–30 Ma. A preceding ca. 160–135 Ma cooling event is generally restricted to the western rift margin in the Lüliangshan and Hengshan. In contrast, the ca. 50–30 Ma cooling event was widespread and occurred coevally with the opening of the Bohai Basin and slip across the NNE‐striking Eastern Taihangshan fault. In the southern rift zone, however, exhumation beginning ca. 50 Ma was likely associated with fault block uplift across the ESE–striking Qinling and Huashan faults, which accompanied the extensional opening of the Weihe Graben. Coeval fault slip along the NNE–striking Eastern Taihangshan faults and ESE–striking Qinling and Huashan faults was associated with NW‐SE extension in North China related to oblique subduction of the Pacific plate under Eastern Asia and slow convergence rates. The Shanxi Rift is commonly attributed to Late Miocene and younger extension, but our new thermochronologic data do not precisely record the onset of rifting. However, our inversion models do suggest ≤∼50 ºC of Neogene–Quaternary cooling, consistent with ≤∼2 km of footwall uplift across most range‐bounding faults.

中文翻译:

华北山西大裂谷和太行山的区域发掘与构造历史

这项研究提供了来自华北山西裂谷,太行山和东部鄂尔多斯地块的综合低温热时计数据集,包括新的磷灰石裂变径迹和磷灰石(U‐Th‐Sm)/ He数据以及已发布的磷灰石和锆石裂变径迹和(U‐Th‐Sm)/ He数据。我们使用这些数据和新的热历史反演模型来揭示,山西裂谷和太行山的冷却速度在大约2到9℃之间有所增加。110–70 Ma,约。50-30 Ma。前一个ca。160-135 Ma的冷却事件通常仅限于吕梁山和衡山的西部裂谷边缘。相反,ca。50-30 Ma的冷却事件是广泛的,并随着渤海盆地的开放而明显发生,并滑过NNE撞击的东太行山断层。然而,在南部裂谷带,尸体发掘始于大约。50 Ma可能与横跨ESE的秦岭和华山断裂的断块抬升有关,伴随着渭河Graben的张开。沿北北东向太行山断裂和东经向秦岭和华山断裂的沿时代断层滑移与华北的北西向东南伸展有关,这与东亚太平洋下的太平洋板块俯冲俯冲和收敛速度慢有关。山西裂谷通常归因于中新世晚期和较年轻的扩张,但我们新的热年代学数据并未精确记录裂谷的发生。然而,我们的反演模型的确建议新近纪-第四纪冷却≤50ºC,这与大多数跨界断层的下盘面抬升≤2km一致。伴随着Weihe Graben的对外开放。沿北北东向太行山断裂和东经向秦岭和华山断裂的沿时代断层滑移与华北的北西向东南伸展有关,这与东亚太平洋下的太平洋板块俯冲俯冲和收敛速度慢有关。山西裂谷通常归因于中新世晚期和较年轻的扩张,但我们新的热年代学数据不能精确地记录裂谷的发生。然而,我们的反演模型的确建议新近纪-第四纪冷却≤50ºC,这与大多数跨界断层的下盘面隆升≤2km一致。伴随着Weihe Graben的对外开放。沿北北东向太行山断裂和东经向秦岭和华山断裂的沿时代断层滑移与华北的北西向东南伸展有关,这与东亚太平洋下的太平洋板块俯冲俯冲和收敛速度慢有关。山西裂谷通常归因于中新世晚期和较年轻的扩张,但我们新的热年代学数据并未精确记录裂谷的发生。然而,我们的反演模型的确建议新近纪-第四纪冷却≤50ºC,这与大多数跨界断层的下盘面隆升≤2km一致。沿北北东向太行山断裂和东经向秦岭和华山断裂的沿时代断层滑移与华北的北西向东南伸展有关,这与东亚太平洋下的太平洋板块俯冲俯冲和收敛速度慢有关。山西裂谷通常归因于中新世晚期和较年轻的扩张,但我们新的热年代学数据并未精确记录裂谷的发生。然而,我们的反演模型的确建议新近纪-第四纪冷却≤50ºC,这与大多数跨界断层的下盘面隆升≤2km一致。沿北北东向太行山断裂和东经向秦岭和华山断裂的沿时代断层滑移与华北的北西向东南伸展有关,这与东亚太平洋下的太平洋板块俯冲俯冲和收敛速度慢有关。山西裂谷通常归因于中新世晚期和较年轻的扩张,但我们新的热年代学数据并未精确记录裂谷的发生。然而,我们的反演模型的确建议新近纪-第四纪冷却≤50ºC,这与大多数跨界断层的下盘面抬升≤2km一致。
更新日期:2021-01-21
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