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Two‐stage Cretaceous Exhumation of Hengshan Complex in Hunan Province, SE China: Constraints Arising from 40 Ar– 39 Ar Geochronology and Cretaceous Tectonic Implications

Two‐stage Cretaceous Exhumation of Hengshan Complex in Hunan Province, SE China: Constraints... The Hengshan complex is located in the central part of SE China, which underwent rapid tectonic uplift in the Cretaceous just like many other complexes on the continent. 40Ar–39Ar geochronological data from the Hengshan complex suggest that two episodes of crustal cooling/extension took place in this part of the continent during the Cretaceous time. The first stage of exhumation was active during ca. 136–125 Ma, with a cooling rate of > 10 °C/Ma. The second stage of exhumation happened at ca. 98–93 Ma, with a cooling rate of > 10 °C/Ma. Considering the folding in the Lower Cretaceous sedimentary rocks and the regional unconformity underneath the Upper Cretaceous red beds, it is believed that the Cretaceous crustal extension in SE China was interrupted by a compressional event. The reversion to extension, shortly after this middle Cretaceous compression, led to the rapid cooling/exhumation of the Hengshan complex at ca. 98–93 Ma. The Cretaceous tectonic processes in the hinterland of SE China could be controlled by interactions between the continental margin and the Paleo–pacific plate. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Geologica Sinica (English Edition) Wiley

Two‐stage Cretaceous Exhumation of Hengshan Complex in Hunan Province, SE China: Constraints Arising from 40 Ar– 39 Ar Geochronology and Cretaceous Tectonic Implications

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References (68)

Publisher
Wiley
Copyright
© 2015 Geological Society of China
ISSN
1000-9515
eISSN
1755-6724
DOI
10.1111/1755-6724.12604
Publisher site
See Article on Publisher Site

Abstract

The Hengshan complex is located in the central part of SE China, which underwent rapid tectonic uplift in the Cretaceous just like many other complexes on the continent. 40Ar–39Ar geochronological data from the Hengshan complex suggest that two episodes of crustal cooling/extension took place in this part of the continent during the Cretaceous time. The first stage of exhumation was active during ca. 136–125 Ma, with a cooling rate of > 10 °C/Ma. The second stage of exhumation happened at ca. 98–93 Ma, with a cooling rate of > 10 °C/Ma. Considering the folding in the Lower Cretaceous sedimentary rocks and the regional unconformity underneath the Upper Cretaceous red beds, it is believed that the Cretaceous crustal extension in SE China was interrupted by a compressional event. The reversion to extension, shortly after this middle Cretaceous compression, led to the rapid cooling/exhumation of the Hengshan complex at ca. 98–93 Ma. The Cretaceous tectonic processes in the hinterland of SE China could be controlled by interactions between the continental margin and the Paleo–pacific plate.

Journal

Acta Geologica Sinica (English Edition)Wiley

Published: Dec 1, 2015

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