Laramide Deformation and Flexural Effects in the Upper Cretaceous: A Basin in Transition
Laramide Deformation and Flexural Effects in the Upper Cretaceous: A Basin in Transition
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DOI：
10.1306/30578rudolph2018
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发表时间：
2018
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影响因子：
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通讯作者：
Kurt W. Rudolph;Joel P. Saylor
中科院分区：
文献类型：
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作者：
Kurt W. Rudolph;Joel P. Saylor
在晚白垩世，西部内陆的沉降性质从连续的（Sevier）前陆演变为分隔的（Laramide）盆地，同时增加了长波长的“动态”沉降（Yonkee和Weil，2015）。这种演变被许多人解释为（例如，Painter和Carrapa，2013; Liu等人，2014年）作为平板俯冲的指标。然而，时间和地理位置的变化沉降机制仍然很少记录。为了更好地评估地球动力学机制负责这种转变，我们绘制了活动元素与时间的关系，包括经典的弧后前深，盆地内隆起，长波沉降，和当地的弯曲楔相邻的上升Laramide结构。标准包括等厚线、古地理学、地史分析、不整合面/折返和沉积扩散模式。
The nature of subsidence in the Western Interior evolved in the Late Cretaceous from a contiguous (Sevier) foreland to partitioned (Laramide) basins coeval with an increase in long-wavelength “dynamic” subsidence (Yonkee and Weil, 2015). This evolution is interpreted by many (e.g., Painter and Carrapa, 2013; Liu et al., 2014) as indicators of flat-slab subduction. However, the timing and geographic location of changing subsidence mechanisms remains poorly documented. To better assess the geodynamic mechanisms responsible for this transition, we have mapped active elements versus time, including classic retroarc foredeeps, intra-basinal uplifts, long-wavelength subsidence, and local flexural wedges adjacent to rising Laramide structures. Criteria include isopachs, paleogeography, geohistory analysis, unconformities/exhumation, and sediment-dispersal patterns.