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首页> 外文期刊>Seismological research letters >Formation of the Marianna Gap, A Transverse Stream Valley, through Crowley's Ridge, Northern Mississippi Alluvial Valley, USA
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Formation of the Marianna Gap, A Transverse Stream Valley, through Crowley's Ridge, Northern Mississippi Alluvial Valley, USA

机译：穿越美国密西西比河冲积谷北部克劳利山脊的横向溪谷玛丽安娜峡谷的形成

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Based on geomorphology, ages, and stratigraphy, the Marianna gap through Crowley's ridge, a 13 km breach through a large-scale unconsolidated horst in the Mississippi Alluvial Valley, as well as the transverse drainage that flows through the gap, began forming about 17 ka and were completely formed by 7-10 ka. Formation was driven by tectonic subsidence along part of the eastern margin of the Reelfoot rift, an aulacogen that has impacted development of the Mississippi Alluvial Valley region since the Precambrian. The breach occurred gradually, by subsidence- driven fluvial erosion, and/ or suddenly, by faulting. Our findings build on previous studies that suggest the eastern Reelfoot rift margin, as well as other nearby faults, have been recently active, evidenced by large-scale sand blows emplaced in the Marianna gap area in the past 5-12 ky. We propose a mode of transverse drainage development that differs from previous modes in that it is driven by subsidence within a sedimentary basin, rather than uplift in an orogenic mountain belt. Our findings have implications for understanding both transverse drainage development in a sedimentary basin, and seismic potential of the Mississippi Alluvial Valley and other aulacogens worldwide.
机译：根据地貌，年龄和地层，穿过克劳利山脊的玛丽安娜差距，密西西比冲积山谷中大规模的未整合霍斯特裂隙13公里以及流经该差距的横向排水开始形成约17 ka并完全由7-10 ka组成。形成是由沿Reelfoot裂谷东部边缘的部分构造沉降驱动的。自前寒武纪以来，这是一种影响了密西西比冲积谷地区发展的成因。破坏是由沉降驱动的河流侵蚀逐渐发生的，和/或突然由断裂引起的。我们的发现建立在以前的研究基础之上，这些研究表明东部Reelfoot裂谷边缘以及其他附近的断层最近很活跃，过去5-12 ky在玛丽安娜间隙地区发生的大规模喷沙便证明了这一点。我们提出了一种横向排水发展模式，该模式与以前的模式不同，它是由沉积盆地中的沉降驱动的，而不是由造山带中的隆升驱动的。我们的发现对于理解沉积盆地中的横向排水发展以及密西西比冲积谷和世界范围内其他藻源的地震潜力具有重要意义。

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