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Exhumation history of the north-central Shanxi Rift, North China, revealed by low-temperature thermochronology

机译:山西北部山西河北河北河北河北河,展示了低温热量学

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We present new apatite U-Th-Sm/He (AHe; n = 51), apatite fission track data (AFT; n = 12), and zircon U-Th/He (ZHe; n = 8) data for two elevation transects in the north-central Shanxi Rift, North China. Low-temperature thermochronologic data combined with forward and inverse time-temperature history models reveal a Precambrian to Quaternary thermal history characterized by: (1) cooling to 3.5 degrees C/Ma during the Late Jurassic to earliest Cretaceous Yanshanian orogeny; (4) a possible ca. 120-90 Ma reheating event due to elevated geothermal gradients and/or local sediment burial; (5) Late Cretaceous (ca. 110-65 Ma) cooling contemporaneous with regional extension in eastern Asia and denudation of the paleo-Taihangshan highlands; and finally, (6) post ca. 10 Ma cooling associated with extension in the Shanxi Rift. AFT dates from the deepest exhumed structural positions of the sampled footwall blocks are mostly >65 Ma and AHe dates tend to be highly dispersed within samples. AFT inverse and AHe forward model results indicate that samples were at temperatures of 100%) higher than long-term rates inferred from the thermochronologic data. (C) 2020 Elsevier B.V. All rights reserved.
机译:我们呈现新的磷灰石U-TH-SM / HE(AHE; n = 51),磷灰石裂变轨迹数据(AFT; n = 12),以及两个高程横断面的zircon u-th / he(zhe; n = 8)数据在山西北部山西裂口,华北地区。低温热量数据与前进和逆时间 - 温度历史模型相结合,展示了一种前兆的热历史,其特征在于:(1)在正常古代期间冷却到<类似于50摄氏度的恒定,与新的区域的区域不一致的发展一致-Paleoprotozoic克拉紧地下室岩石; (2)由于在古生代到中生代期间,由于沉积物埋葬而再加热至<类似于180℃; (3)在晚期侏罗纪到最早的白垩纪燕山洋葱,以速度> 3.5摄氏度的冷却; (4)可能的CA. 120-90 mA重新加热事件由于地热梯度高升高和/或局部沉积物埋藏; (5)晚白垩纪(CA.110-65 MA)在东亚地区延期冷却与地区延期,普雷太阳山高地的剥蚀;最后,(6)邮寄。 10 mA冷却与山西裂谷的延伸相关。从采样脚壁块的最深膨胀的结构位置的AFT日期大多是> 65 mA,AHE日期往往会在样品中高度分散。 AFT逆和AHE正向模型结果表明样品在<类似于约75摄氏度的温度下。 70 mA。尽管早期的新生代和较旧的AFT和AHE日期,Metammit Zircon谷物具有高效率的铀(EU 750 ppm)产量Young Zhe的CA。 13-9 mA,符合晚期挖掘。我们争论了CA的最新冷却的开始。基于这些哲约10 mA;然而,河流发作的精确时间仍然不确定。结果进一步表明,山西北部的晚期内肾 - 第四纪延期负责<=类似于2.5公里的挖掘,这已发表的第四纪延期和故障投降率明显(> 100%)高于长期从ThermoChronologic数据推断出速率。 (c)2020 Elsevier B.v.保留所有权利。

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