Origin and Significance of the Wasatch and Valley Mountains Monoclines, Sanpete-Sevier Valley Area, Central Utah

I. J. Witkind, W. R. Page
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引用次数: 6

Abstract

Two major opposing monoclines trend northward through the Sanpete-Sevier Valley area, central Utah. The Wasatch monocline, along the eastern edge of the area, faces west and forms the west flank of the Wasatch Plateau. Some 20 km (12 mi) to the west is the Valley Mountains monocline which faces east and forms the east flank of the Valley Mountains. Canyons cut in each monocline expose similar Cretaceous and Tertiary units that focally are complexly deformed. In both monoclines the same structural pattern has been impressed on these Cretaceous and Tertiary rocks, implying that both monoclines were formed approximately contemporaneously by the same geologic processes. We attribute the structural complexity of the Cretaceous-Tertiary sequence to the repeated growth and collapse of compound salt diapirs. We postulate at least three such diapiric episodes. The linearity, trend, and some of the height that mark each monocline are due partly to widespread fate Tertiary and Quaternary basin and range block faulting and partly to the dissolution of salt from individually distinct diapirs. This dissolution of salt removed the support for the overlying beds which then progressively sank. The sinking of discrete compound salt diapirs (one underlies Sanpete Valley and another underlies part of Sevier Valley) resulted in the full-scale formation of the Wasatch and Valley Mountains monoclines, respectively.
犹他州中部Sanpete-Sevier山谷地区,Wasatch和Valley山单斜的起源和意义
两个主要的对立单线向北穿过犹他州中部的桑皮特-塞维尔山谷地区。沿着该地区东部边缘的瓦萨奇单斜面向西,形成了瓦萨奇高原的西侧翼。向西约20公里(12英里)是面向东方的山谷山脉单斜,形成了山谷山脉的东侧翼。在每个单斜上切割的峡谷暴露出相似的白垩纪和第三纪单元,这些单元局部变形复杂。在这两个单斜岩中,白垩纪和第三纪岩石上留下了相同的构造模式,这意味着这两个单斜岩几乎是在同一地质过程中形成的。白垩纪-第三纪层序的构造复杂性归因于复合盐底辟的反复生长和崩塌。我们假定至少有三次这样的底辟期。每一个单斜的线性、趋势和某些高度部分是由于第三纪和第四纪盆地和山脉断块的广泛分布,部分是由于个别不同底辟的盐的溶解。盐的溶解使上面的岩层失去了支撑,然后逐渐下沉。离散的复合盐底辟(一个位于桑皮特谷,另一个位于塞维尔谷的一部分)的下沉导致了瓦萨奇山和山谷山单斜的完整形成。
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