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首页> 外文期刊>Geosciences >Structural Evolution of the East Sierra Valley System (Owens Valley and Vicinity), California: A Geologic and Geophysical Synthesis
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Structural Evolution of the East Sierra Valley System (Owens Valley and Vicinity), California: A Geologic and Geophysical Synthesis

机译：加利福尼亚州东部山脉山谷系统（欧文斯山谷和邻近地区）的结构演化：地质和地球物理综合

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摘要

The tectonically active East Sierra Valley System (ESVS), which comprises the westernmost part of the Walker Lane-Eastern California Shear Zone, marks the boundary between the highly extended Basin and Range Province and the largely coherent Sierra Nevada-Great Valley microplate (SN-GVm), which is moving relatively NW. The recent history of the ESVS is characterized by oblique extension partitioned between NNW-striking normal and strike-slip faults oriented at an angle to the more northwesterly relative motion of the SN-GVm. Spatially variable extension and right-lateral shear have resulted in a longitudinally segmented valley system composed of diverse geomorphic and structural elements, including a discontinuous series of deep basins detected through analysis of isostatic gravity anomalies. Extension in the ESVS probably began in the middle Miocene in response to initial westward movement of the SN-GVm relative to the Colorado Plateau. At ca. 3–3.5 Ma, the SN-GVm became structurally separated from blocks directly to the east, resulting in significant basin-forming deformation in the ESVS. We propose a structural model that links high-angle normal faulting in the ESVS with coeval low-angle detachment faulting in adjacent areas to the east.
机译：具有活动性的东塞拉利昂山谷系统（ESVS）包括沃克车道-美国加州东部剪切带的最西端，标志着高度延伸的盆地和兰格省与内华达山脉-大山谷微板块（SN- GVm），它正在向西北移动。 ESVS的最新历史的特征是，倾斜延伸被划分为NNW走向的正断层和走滑断层，其走向与SN-GVm的更西北的相对运动成一定角度。空间可变的延伸和右向剪切作用导致形成了由不同地貌和结构要素组成的纵向分段谷系统，包括通过等静重力异常分析检测到的一系列不连续的深盆。响应于SN-GVm相对于科罗拉多高原的最初西移，ESVS的扩展可能始于中新世中期。约于在3–3.5 Ma时，SN-GVm在结构上与块体直接向东分离，从而导致ESVS发生明显的盆地形成变形。我们提出了一种结构模型，将ESVS中的大角度正断层与东部相邻区域的同时代的小角度分离断层联系起来。

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