Late Paleogene emergence of a North American loess plateau

Author:

Fan Majie1,Feng Ran2,Geissman John W.34,Poulsen Christopher J.5

Affiliation:

1. University of Texas at Arlington, Department of Earth an Environmental Sciences, 500 Yates Street, Arlington, Texas 76019, USA

2. University of Connecticut, Center for Integrative Geosciences, 354 Mansfield Road, unit 1045, Storrs, Connecticut 06269, USA

3. University of Texas at Dallas, Department of Geosciences, ROC 21, 800 West Campbell Road, Richardson, Texas 75080, USA

4. University of New Mexico, Department of Earth and Planetary Sciences, MSC03 2040, Albuquerque, New Mexico 87131, USA

5. University of Michigan, Department of Earth and Environmental Sciences, 1100 North University Avenue, Ann Arbor, Michigan 48109, USA

Abstract

Abstract The relative roles of tectonics and global climate in forming the hydroclimate for widespread eolian deposition remain controversial. Oligocene loess has been previously documented in the interior of western United States, but its spatiotemporal pattern and causes remain undetermined. Through new stratigraphic record documentation and data compilation, we reveal the time transgressive occurrence of loess beginning in the latest Eocene in the central Rocky Mountains, that expands eastward to the Great Plains across the Eocene-Oligocene transition (EOT). Our climate simulations show that moderate uplift of the southern North America Cordillera initiated drying in the Cordilleran hinterland and immediate foreland, forming a potential dust source and sink, and global cooling at the EOT expanded the drying and eolian deposition eastward by causing retreat of the North American Monsoon. Therefore, the eolian deposition reflects continental aridification induced both by regional tectonism and global climate change during the late Paleogene.

Publisher

Geological Society of America

Subject

Geology

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