Seismic Reflection and Electrical Resistivity Imaging Support Pre‐Quaternary Glaciation in the Rocky Mountains (Unaweep Canyon, Colorado)

Seismic Reflection and Electrical Resistivity Imaging Support Pre‐Quaternary Glaciation in the Rocky Mountains (Unaweep Canyon, Colorado)
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地震反射和电阻率成像支持落基山脉第四纪冰川作用之前(科罗拉多州乌纳威普峡谷)

DOI:
10.1029/2021gl094706
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发表时间:
2021
影响因子:
5.2
通讯作者:
Soreghan, Gerilyn S.
Soreghan, Gerilyn S.
中科院分区:
地球科学1区
文献类型:
--
作者:
Patterson, Anna;Behm, Michael;Chwatal, Werner;Flores‐Orozco, Adrian;Wang, Yichuan;Soreghan, Gerilyn S.

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乌纳威普峡谷(科罗拉多州安康帕格里高原)代表着一个具有复杂演变过程的神秘景观。对其起源的解释范围从新生代晚期的祖先河流侵蚀到古生代的冰川侵蚀,或它们的某种组合,对全球气候和大规模构造重建具有重要意义。为了解决相互矛盾的解释,我们获取了高分辨率地震反射剖面来研究峡谷的深度、结构和沉积填充物。该数据集进一步通过电阻率调查得到补充。结合其他地球物理和地质数据,结果显示前寒武纪基底过深,呈横向U形,支持了前第四纪冰川起源的假说。我们的数据构成了北美被掩埋的前第四纪冰川山谷的第一张详细图像;如果通过核心研究得到证实,这些结果将对我们了解全球冰库以及构造条件产生深远的影响,从而能够保护此类系统。
Unaweep Canyon (Uncompahgre Plateau, Colorado) represents an enigmatic landscape with a complex evolution. Interpretations for its origin have ranged from ancestral fluvial erosion in the late Cenozoic to glacial erosion in the Paleozoic, or some combination thereof, with significant implications for global climatic and large‐scale tectonic reconstructions. To address the conflicting interpretations, we acquired a high‐resolution seismic reflection profile to investigate the depth, structure, and sedimentary infill in the canyon. The data set is further complemented with an electrical resistivity survey. Integrated with other geophysical and geological data, the results show an overdeepened Precambrian basement with transverse U shape and support the hypothesis of a pre‐Quaternary glacial origin. Our data constitute the first detailed image of a buried pre‐Quaternary glacial valley in North America; if substantiated with core studies, these results have far‐reaching implications for our understanding of global ice houses as well as the tectonic conditions, enabling preservation of such systems.
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