Eruptive history of the Karoo lava flows and their impact on early Jurassic environmental change:

Moulin, Maud; Fluteau, Frédéric; Courtillot, Vincent; Marsh, Julian S; Delpech, Guillaume; Quidelleur, Xavier; Gérard, Martine

Title: Eruptive history of the Karoo lava flows and their impact on early Jurassic environmental change:
Creator: Moulin, Maud
Creator: Fluteau, Frédéric
Creator: Courtillot, Vincent
Creator: Marsh, Julian S
Creator: Delpech, Guillaume
Creator: Quidelleur, Xavier
Creator: Gérard, Martine
Date Issued: 2017
Date: 2017
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/145098
Identifier: vital:38408
Identifier: https://doi.org/10.1002/2016JB013354
Description: This paper reports new paleomagnetic and geochronologic data from a ~1500 m thick composite section belonging to the Drakensberg group, the thickest remnant of the Karoo lavas in Northern Lesotho. Flow‐by‐flow analysis of paleomagnetic directions reveals 21 magnetic directional groups, corresponding to single eruptive events, and 16 individual lava flows. The new age determinations of lava flows range from 180.1 ± 1.4 to 182.8 ± 2.6 Ma. These data, combined with previous results, allow us to propose that the main part of the Drakensberg group and the Karoo intrusive complex dated around 181–183 Ma may have been erupted over a period as short as 250 kyr and may have coincided with the two main phases of extinction in the Early Toarcian. This scenario agrees well with the discontinuous rhythm of environmental and biotic perturbations in the Late Pliensbachian‐Toarcian interval.
Format: 35 pages
Format: pdf
Language: English
Relation: Journal of Geophysical Research: Solid Earth
Relation: Moulin, M., Fluteau, F., Courtillot, V., Marsh, J., Delpech, G., Quidelleur, X. and Gérard, M., 2017. Eruptive history of the Karoo lava flows and their impact on early Jurassic environmental change. Journal of Geophysical Research: Solid Earth, 122(2), pp.738-772.
Relation: Journal of Geophysical Research: Solid Earth volume 122 number 2 738 772 2017 2169-9313
Rights: Publisher
Rights: Use of this resource is governed by the terms and conditions of the Wiley Library Online Terms of Use Statement (https://onlinelibrary.wiley.com/terms-and-conditions)

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