气候变化领域集成服务门户(CCPortal): Investigating the formation of the Cretaceous Western Interior Seaway using landscape evolution simulations

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DOI	10.1130/B35653.1
	Investigating the formation of the Cretaceous Western Interior Seaway using landscape evolution simulations
	Chang C.; Liu L.
发表日期	2020
ISSN	167606
起始页码	347
结束页码	361
卷号	133
英文摘要	Transient intraplate sedimentation like the widespread Late Cretaceous Western Interior Seaway, traditionally considered a flexural foreland basin of the Sevier orogeny, is now generally accepted to be a result of dynamic topography due to the viscous force from mantle downwelling. However, the relative contributions of flexural versus dynamic subsidence are poorly understood. Furthermore, both the detailed subsidence history and the underlying physical mechanisms remain largely unconstrained. Here, we considered both Sevier orogenic loading and three different dynamic topography models that correspond to different geodynamic configurations. We used forward landscape evolution simulations to investigate the surface manifestations of these tectonic scenarios on the regional sedimentation history. We found that surface processes alone are unable to explain Western Interior Seaway sedimentation in a purely orogenic loading system, and that sedimentation increases readily inland with the additional presence of dynamic subsidence. The findings suggest that dynamic subsidence was crucial to Western Interior Seaway formation and that the dominant control on sediment distribution in the Western Interior Seaway transitioned from flexural to dynamic subsidence during 90–84 Ma, coinciding with the proposed emplacement of the conjugate Shatsky oceanic plateau. Importantly, the sedimentation records require the underlying dynamic subsidence to have been landward migratory, which implies that the underlying mechanism was the regional-scale mantle downwelling induced by the sinking Farallon flat slab underneath the westwardmoving North American plate. The simulated landscape evolution also implies that prominent regional-scale Laramide uplift in the western United States should have occurred no earlier than the latest Cretaceous. © 2020 Geological Society of America
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184767
作者单位	Department of Geology University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
推荐引用方式 GB/T 7714	Chang C.,Liu L.. Investigating the formation of the Cretaceous Western Interior Seaway using landscape evolution simulations[J],2020,133.
APA	Chang C.,&Liu L..(2020).Investigating the formation of the Cretaceous Western Interior Seaway using landscape evolution simulations.Bulletin of the Geological Society of America,133.
MLA	Chang C.,et al."Investigating the formation of the Cretaceous Western Interior Seaway using landscape evolution simulations".Bulletin of the Geological Society of America 133(2020).