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Climatic evolution across oceanic anoxic event 1a derived from terrestrial palynology and clay minerals (Maestrat Basin, Spain)

Published online by Cambridge University Press:  30 October 2014

JEAN CORS ,
ULRICH HEIMHOFER ,
THIERRY ADATTE ,
PETER A. HOCHULI ,
STEFAN HUCK  and
TELM BOVER-ARNAL
JEAN CORS
Affiliation:
Institute of Geology, Leibniz University Hannover, Callinstraße 30, 30167 Hannover, Germany
ULRICH HEIMHOFER*
Affiliation:
Institute of Geology, Leibniz University Hannover, Callinstraße 30, 30167 Hannover, Germany
THIERRY ADATTE
Affiliation:
Institute of Geology and Palaeontology, Université de Lausanne, CH-1015 Lausanne, Switzerland
PETER A. HOCHULI
Affiliation:
Palaeontological Institute and Museum, University of Zurich, Karl Schmid-Str. 4, Ch-8006 Zurich, Switzerland
STEFAN HUCK
Affiliation:
Institute of Geology, Leibniz University Hannover, Callinstraße 30, 30167 Hannover, Germany
TELM BOVER-ARNAL
Affiliation:
Departament de Geoquímica, Petrologia i Prospecció Geòlogica, Facultat de Geologia, Universitat de Barcelona, c/ de Martí i Franquès s/n, 08028 Barcelona, Spain
*
†Author for correspondence: [email protected]
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Abstract

Studies dealing with the response of the continental biosphere to the environmental perturbations associated with Cretaceous oceanic anoxic events (OAEs) are comparatively rare. Here, a quantitative spore-pollen record combined with clay mineral data is presented, which covers the entire early Aptian OAE 1a interval (Forcall Formation, Maestrat basin, east Spain). The well-expressed OAE 1a carbon-isotope anomaly is paralleled by changes in the clay mineral assemblage and by a stepwise decline in the normalized frequency of Classopollis pollen (produced by xerophytic Cheirolepidiaceae) with lowest contents occurring during the positive δ13C shift. In contrast, Araucariacites and Inaperturopollenites pollen show a pronounced increase in relative abundance from low background values to become a significant component of the palynological assemblage during the Classopollis minimum. The observed changes in clay minerals and pollen distribution patterns are interpreted to reflect a major change in the composition of the hinterland vegetation of the Maestrat Basin, most probably due to short-lived but pronounced climatic cooling and changes in humidity. Temperature anomalies driven by organic carbon burial and associated CO2 decline have been postulated for all major Mesozoic OAEs. The palynomorph record from the Iberian Maestrat basins indicates that the climax of this cooling episode was significantly delayed in comparison to the end of organic carbon-rich deposition in the world oceans.

Keywords

early AptianMaestrat Basinoceanic anoxic event 1apalynologyclay minerals
Type
Original Articles
Information
Geological Magazine , Volume 152 , Issue 4 , July 2015 , pp. 632 - 647
Copyright
Copyright © Cambridge University Press 2014 

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Supplementary material: File

Cors Supplementary Material

Table S1

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Supplementary material: File

Cors Supplementary Material

Table S2

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