The rise and fall of Laramide topography and the sediment evacuation from Wyoming

The modern topography within the Laramide region consists of high-relief ranges and high-elevation low-relief (HELR) surfaces separated by intraforeland basins. However, the timing and development of this topography within the type-locality of the Wyoming Laramide province is poorly understood. Previous models suggest that the modern topography is a young feature that was acquired after Laramide tectonism, post-Laramide burial, and basin evacuation; however, evidence of such a progression is sparse. We present low-temperature-thermochronological data from two Laramide uplifts in Wyoming, the Wind River and Bighorn Ranges, which document an early record of Laramide exhumation, subsequent reheating, and significant cooling after 10 Ma. Our results indicate that the Laramide ranges were buried by post-Laramide Cenozoic basin fill, creating a low-relief topography by the early Miocene that was reduced due to late Miocene regional incision and basin evacuation. We suggest that HELR surfaces experienced further relief reduction from Pleistocene glaciation. For inquiries regarding the contents of this dataset, please contact the Corresponding Author listed in the README.txt file. Administrative inquiries (e.g., removal requests, trouble downloading, etc.) can be directed to [e-mail]

拉拉米德地区的现代地形由高差显著的山脉和海拔较高但起伏较小的（HELR）地表构成，两者之间以内陆前陆盆地相隔。然而，关于这种地形在怀俄明州拉拉米德省类型原地的形成时间和演变过程，我们的理解尚显不足。先前的研究模型表明，现代地形是一种较新的特征，它是在拉拉米德构造运动、拉拉米德期埋藏以及盆地排空之后形成的；然而，此类演变的证据较为匮乏。本研究从怀俄明州的两个拉拉米德抬升区——温河山脉和大角山脉，提供了低温热年代学数据，这些数据记录了拉拉米德抬升的早期历史、随后地壳的重新加热以及距今1000万年后显著的冷却。我们的研究结果指出，拉拉米德山脉被拉拉米德期后的新生代盆地沉积物所覆盖，形成了早期中新世的低起伏地形，这一地形随后由于晚中新世的区域侵蚀和盆地排空而减弱。我们推测，HELR地表在更新世冰川作用的影响下进一步降低了地表起伏。有关本数据集内容的相关咨询，请参阅README.txt文件中列出的通讯作者。关于行政方面的查询（例如，删除请求、下载问题等）可发送至[e-mail]。