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A true polar wander trigger for the great Jurassic east Asian aridification

Yi Zhiyu, Liu Yongqing and Joseph G. Meert
A true polar wander trigger for the great Jurassic east Asian aridification
Geology (Boulder) (October 2019) 47 (12): 1112-1116

Abstract

A drastic environmental change occurred during the Middle to Late Jurassic as much of East Asia transitioned from a wet seasonal to an extremely arid climate. The timing, scope, and especially mechanism for this aridification are contentious. In this study, we report paleomagnetic data and ages from Jurassic volcanic rocks in North China and for the first time reveal a large-scale southward displacement of approximately 25 degrees for the Eastern Asian blocks (EABs) sometime between 174+ or -6 Ma and 157+ or -4 Ma. We suggest that the rapid motion documented by our paleomagnetic studies resulted from large-scale true polar wander (TPW). The TPW rotation displaced the EABs from the Northern Hemisphere humid-temperate belt into the subtropical/tropical arid zone. The resultant latitudinal motion coincided with a remarkable environmental change recorded over 10,000,000 km2 in East Asia between ca. 165 Ma and 155 Ma. We call the climate transition the "Great Jurassic East Asian Aridification" and argue that TPW-induced climatic shifts were also responsible for the demise of the Yanliao Biota and subsequent radiation of the Jehol Biota during the Late Jurassic and Early Cretaceous.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 47
Serial Issue: 12
Title: A true polar wander trigger for the great Jurassic east Asian aridification
Affiliation: Chinese Academy of Geological Sciences, Institute of Geology, Laboratory of Deep-Earth Dynamics, Beijing, China
Pages: 1112-1116
Published: 20191015
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 37
Accession Number: 2019-095282
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N20°00'00" - N53°00'00", E74°00'00" - E135°00'00"
Secondary Affiliation: University of Florida, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201950
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