Reduced plate motion controlled timing of Early Jurassic Karoo-Ferrar large igneous province volcanism

Ruhl, Micha; Hesselbo, Stephen P.; Jenkyns, Hugh C.; Xu, Weimu; Silva, Ricardo L.; Matthews, Kara J.; Mather, Tamsin A.; Mac Niocaill, Conall; Riding, James B. ORCID: https://orcid.org/0000-0002-5529-8989. 2022 Reduced plate motion controlled timing of Early Jurassic Karoo-Ferrar large igneous province volcanism. Science Advances, 8 (36). https://doi.org/10.1126/sciadv.abo0866

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Official URL: http://dx.doi.org/10.1126/sciadv.abo0866

Abstract/Summary

Past large igneous province (LIP) emplacement is commonly associated with mantle plume upwelling and led to major carbon emissions. One of Earth’s largest past environmental perturbations, the Toarcian oceanic anoxic event (T-OAE; ~183 Ma), has been linked to Karoo-Ferrar LIP emplacement. However, the role of mantle plumes in controlling the onset and timing of LIP magmatism is poorly understood. Using global plate reconstruction models and Lower Toarcian sedimentary mercury (Hg) concentrations, we demonstrate (i) that the T-OAE occurred coevally with Karoo-Ferrar emplacement and (ii) that timing and duration of LIP emplacement was governed by reduced Pangean plate motion, associated with a reversal in plate movement direction. This new model mechanistically links Earth’s interior and surficial processes, and the mechanism is consistent with the timing of several of the largest LIP volcanic events throughout Earth history and, thus, the timing of many of Earth’s past global climate change and mass extinction events.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1126/sciadv.abo0866
ISSN:	2375-2548
Date made live:	18 Oct 2022 13:16 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/533373

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1126/sciadv.abo0866

ISSN:

2375-2548

Date made live:

18 Oct 2022 13:16 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/533373