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Millennial - to centennial - scale interruptions of the Oceanic Anoxic Event 1b (Early Albian, mid-Cretaceous) inferred from benthic foraminiferal repopulation events

Millennial - to centennial - scale interruptions of the Oceanic Anoxic Event 1b (Early Albian, mid-Cretaceous) inferred from benthic foraminiferal repopulation events
Millennial - to centennial - scale interruptions of the Oceanic Anoxic Event 1b (Early Albian, mid-Cretaceous) inferred from benthic foraminiferal repopulation events
The Early Albian Oceanic Anoxic Event 1b (OAE 1b) black shale is interrupted by one or more ventilation events that display significant changes in benthic and planktic populations. Within the OAE 1b sections studied, at ODP Site 1049, DSDP Site 545, and the Vocontian Basin, the benthic foraminiferal repopulation events last between 500 and 1,250 years and occur with a cyclicity of approximately 5.7 kyr. This period may represent an amplitude modulation of the precessional cycle. The OAE 1b sections from the marginal setting of the Vocontian Basin exhibit up to eight repopulation events. In contrast, there is only one repopulation event identified in the Atlantic OAE 1b sections from the Mazagan Plateau (DSDP 545) and Blake Nose (ODP 1049). Within the margin of dating uncertainties, this supraregional repopulation event occurred synchronously in the Vocontian Basin and the Atlantic Ocean. While the OAE 1b black shale formed under extremely warm and humid conditions, the repopulation events occurred during intervals of short-term cooling and reduced humidity at deep-water formation sites. The resulting increase in evaporation led to enhanced formation of low-latitude deep water, thus improving the ventilation of the sea floor.

0883-0351
64-77
Friedrich, O.
219eb084-560e-4c36-b2f5-b33a8b582c33
Nishi, H.
c60453b0-21bc-41e4-b576-7a2b6ecfb7ce
Pross, J.O.
89999497-962f-47ce-8794-d5fb02b045f8
Schmiedl, G.
e0ad1f9e-6f3e-46df-81cf-15abc837c2ac
Hemleben, C.
0f45ede4-dfec-457e-8a64-b96a5b8c71f0
Friedrich, O.
219eb084-560e-4c36-b2f5-b33a8b582c33
Nishi, H.
c60453b0-21bc-41e4-b576-7a2b6ecfb7ce
Pross, J.O.
89999497-962f-47ce-8794-d5fb02b045f8
Schmiedl, G.
e0ad1f9e-6f3e-46df-81cf-15abc837c2ac
Hemleben, C.
0f45ede4-dfec-457e-8a64-b96a5b8c71f0

Friedrich, O., Nishi, H., Pross, J.O., Schmiedl, G. and Hemleben, C. (2005) Millennial - to centennial - scale interruptions of the Oceanic Anoxic Event 1b (Early Albian, mid-Cretaceous) inferred from benthic foraminiferal repopulation events. Palaios, 20 (1), 64-77. (doi:10.2110/palo.2003.p03-75).

Record type: Article

Abstract

The Early Albian Oceanic Anoxic Event 1b (OAE 1b) black shale is interrupted by one or more ventilation events that display significant changes in benthic and planktic populations. Within the OAE 1b sections studied, at ODP Site 1049, DSDP Site 545, and the Vocontian Basin, the benthic foraminiferal repopulation events last between 500 and 1,250 years and occur with a cyclicity of approximately 5.7 kyr. This period may represent an amplitude modulation of the precessional cycle. The OAE 1b sections from the marginal setting of the Vocontian Basin exhibit up to eight repopulation events. In contrast, there is only one repopulation event identified in the Atlantic OAE 1b sections from the Mazagan Plateau (DSDP 545) and Blake Nose (ODP 1049). Within the margin of dating uncertainties, this supraregional repopulation event occurred synchronously in the Vocontian Basin and the Atlantic Ocean. While the OAE 1b black shale formed under extremely warm and humid conditions, the repopulation events occurred during intervals of short-term cooling and reduced humidity at deep-water formation sites. The resulting increase in evaporation led to enhanced formation of low-latitude deep water, thus improving the ventilation of the sea floor.

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Published date: February 2005

Identifiers

Local EPrints ID: 49986
URI: http://eprints.soton.ac.uk/id/eprint/49986
ISSN: 0883-0351
PURE UUID: 1046b403-a975-49e9-8277-98120bec2f2a

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Date deposited: 08 Jan 2008
Last modified: 15 Mar 2024 10:01

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Contributors

Author: O. Friedrich
Author: H. Nishi
Author: J.O. Pross
Author: G. Schmiedl
Author: C. Hemleben

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