Shoreline evolution in the Late Cretaceous North American Cordilleran foreland basin: An exemplar of the combined influence of tectonics, sea level, and sediment supply through time
Shoreline evolution in the Late Cretaceous North American Cordilleran foreland basin: An exemplar of the combined influence of tectonics, sea level, and sediment supply through time
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DOI：
10.1016/j.earscirev.2022.103947
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发表时间：
2022-02
影响因子：
12.1
通讯作者：
Zhiyang Li;J. Aschoff
中科院分区：
文献类型：
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作者：
Zhiyang Li;J. Aschoff
北美科迪勒拉前陆盆地（CFB）的地层记录作为一个关键的档案如何构造，海平面和沉积物供应相互作用的整个地质过去，提供了宝贵的见解形成和填充的前陆盆地。通过整合一系列地层学、沉积学和年代学数据集，CFB内各种地质过程的作用得到了更好的约束，尤其是可能与大规模地幔流有关的更神秘的地壳下过程。本研究总结了复杂的海岸线演变的CFB（怀俄明州，犹他州，科罗拉多，和新墨西哥州）的中部在25个时间约束的古地理地图，说明高分辨率的海岸线的历史（位置和迁移趋势）和分布的总沉积环境，通过晚白垩世。详细的地层综合表明，CFB的沉积物填充受到复杂的相互作用的构造（本地和区域规模和地壳和地壳下的过程），euclide，和沉积物供应，因为地层叠加模式和海岸线迁移趋势变化沿着的同时代的海岸线在晚白垩世的大部分时间。海岸线迁移趋势的空间变异性以及沉积物散布模式的变化有助于理清地壳和/或壳下过程造成的沉降影响，并对这些过程的空间和时间尺度提供限制。共轭沙茨基隆起），附着在法拉隆板块，被证明是一个重要的机制，影响沉降/隆起和沉积物分散模式在CFB至少85 Ma以来。由于地形载荷、岩石圈强度、幔源动力地形和CFB沉积物供应的空间变化，沿同时代海岸线的海岸线迁移趋势沿着的走向变化可能是常态，而不是例外。尽管量化不同的同种异体因素对CFB地层结构的相对作用仍然是一项具有挑战性的任务，但本文编制的年代地层框架、海岸线趋势和古地理图可以为正演建模提供关键的边界条件，例如地球动力学和景观模型，以更好地理解CFB和全球其他盆地的古地理和构造演化，更全面地考虑了地幔对盆地形成的影响。最终，高分辨率重建的CFB地史，通过整体的方法，将大大提高我们的理解的作用，不同的外源因素在CFB沉积物填充，使我们能够更好地利用地层记录的古环境演变的重要档案和地表和深部地球过程之间的相互作用，通过地质时间。
The stratigraphic record from the North American Cordilleran foreland basin (CFB) serves as a critical archive of how tectonics, sea level, and sediment supply interacted throughout the geologic past, providing valuable insights into the formation and filling of foreland basins. By integrating a range of stratigraphic, sedimentologic, and geochronological datasets, the roles of various geological processes within the CFB are better constrained, especially more enigmatic subcrustal processes probably related to large-scale mantle flows. This study summarizes the complex shoreline evolution of the central part of the CFB (Wyoming, Utah, Colorado, and New Mexico) in 25 temporally constrained paleogeographic maps illustrating high-resolution shoreline history (location and migration trend) and distribution of gross depositional environments through the Late Cretaceous. Detailed stratigraphic synthesis indicates that sediment fill of the CFB was subject to complex interactions of tectonics (both local and regional scale and both crustal and subcrustal processes), eustasy, and sediment supply because stratigraphic stacking patterns and shoreline migration trends varied along the coeval shoreline during most of the Late Cretaceous. The spatial variability in the shoreline migration trend, as well as changes in the sediment dispersal pattern help to disentangle the effects of subsidence caused by crustal and/or subcrustal processes, and provide constraints on the spatial and temporal scales these processes operate on. Subcrustal processes such as mantle flow, possibly associated with enhanced coupling by subduction of an oceanic plateau (i.e., the conjugate Shatsky rise) attached to the Farallon plate, were documented as an important mechanism influencing the subsidence/uplift and sediment dispersal patterns in the CFB since at least ~85 Ma. The along-strike variation in shoreline migration trend along the coeval shoreline is likely the norm, rather than the exception, due to the spatial variation in topographic load, lithospheric strength, mantle-induced dynamic topography, and sediment supply across the CFB. Although quantifying the relative roles of different allogenic factors on the architecture of the CFB strata remains a challenging task, the chronostratigraphic framework, shoreline trends, and paleogeographic maps compiled herein could provide critical boundary conditions for forward modeling, such as geodynamic and landscape models, to better understand the paleogeographic and tectonic evolution of the CFB and other basins worldwide, in a more comprehensive way that considers the effect of the mantle on basin-formation. Eventually, high-resolution reconstruction of the geohistory of the CFB through holistic approaches will greatly advance our understanding of the roles of different allogenic factors in sediment filling of the CFB and enable us to better use the stratigraphic record of foreland basins as important archives of paleoenvironmental evolutions and the interaction between surficial and deep Earth processes through geological time.