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Short-term environmental changes in the Cretaceous Tethyan Ocean: micropaleontological evidence from the Early Albian Oceanic Anoxic Event 1b

Herrle, J.O., Pross, J., Friedrich, O. and Hemleben, C. (2003) Short-term environmental changes in the Cretaceous Tethyan Ocean: micropaleontological evidence from the Early Albian Oceanic Anoxic Event 1b Terra Nova, 15, (1), pp. 14-19. (doi:10.1046/j.1365-3121.2003.00448.x).

Record type: Article

Abstract

To better understand the linkage between climate and ocean circulation under greenhouse conditions we have studied calcareous nannofossils, palynomorphs and benthic foraminifera from the Early Albian Oceanic Anoxic Event 1b black shale (OAE 1b) in the Vocontian Basin (SE France). We propose that monsoonal activity resulting from precessional forcing and modulated by eccentricity-driven temperature changes represents the driving factor of OAE 1b formation in low latitudes. With the onset of OAE 1b, increasingly warm and humid conditions, stronger winds and enhanced terrestrial input led to higher surface water productivity. Therefore, increased productivity is an important factor for OAE 1b formation in the Vocontian Basin. However, monsoonally forced productivity changes are a regional climate signal only. The supraregional occurrence of the OAE 1b is probably due to a reduction of deep water formation in the low latitudes under extremely warm and humid conditions, leading to enhanced preservation of organic matter.

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Published date: February 2003

Identifiers

Local EPrints ID: 49996
URI: http://eprints.soton.ac.uk/id/eprint/49996
PURE UUID: 2cc48643-3ac6-4f42-9c9b-e92ebf4e7ce4

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Date deposited: 08 Jan 2008
Last modified: 17 Jul 2017 14:54

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Contributors

Author: J.O. Herrle
Author: J. Pross
Author: O. Friedrich
Author: C. Hemleben

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