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

Details

Serval ID
serval:BIB_2F1C8DB2A3FC
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Climatic evolution across oceanic anoxic event 1a derived from terrestrial palynology and clay minerals (Maestrat Basin, Spain)
Journal
Geological Magazine
Author(s)
Cors J., Heimhofer U., Adatte T., Hochuli P. A., Huck S., Bover-Arnal T.
ISSN
0016-7568
ISSN-L
1469-5081
Publication state
Published
Issued date
07/2015
Peer-reviewed
Oui
Volume
152
Pages
632-647
Language
english
Abstract
Studies dealing with the response of the continental biosphere to the environmental per- turbations 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 Inaper- turopollenites 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 Aptian, Maestrat Basin, oceanic anoxic event 1a, palynology, clay minerals
Web of science
Publisher's website
Create date
03/07/2018 8:04
Last modification date
20/08/2019 13:13
Usage data