Anomalous K-Pg-aged seafloor attributed to impact-induced mid-ocean ridge magmatism.

Abstract:

:Eruptive phenomena at all scales, from hydrothermal geysers to flood basalts, can potentially be initiated or modulated by external mechanical perturbations. We present evidence for the triggering of magmatism on a global scale by the Chicxulub meteorite impact at the Cretaceous-Paleogene (K-Pg) boundary, recorded by transiently increased crustal production at mid-ocean ridges. Concentrated positive free-air gravity and coincident seafloor topographic anomalies, associated with seafloor created at fast-spreading rates, suggest volumes of excess magmatism in the range of ~105 to 106 km3. Widespread mobilization of existing mantle melt by post-impact seismic radiation can explain the volume and distribution of the anomalous crust. This massive but short-lived pulse of marine magmatism should be considered alongside the Chicxulub impact and Deccan Traps as a contributor to geochemical anomalies and environmental changes at K-Pg time.

journal_name

Sci Adv

journal_title

Science advances

authors

Byrnes JS,Karlstrom L

doi

10.1126/sciadv.aao2994

subject

Has Abstract

pub_date

2018-02-07 00:00:00

pages

eaao2994

issue

2

issn

2375-2548

pii

aao2994

journal_volume

4

pub_type

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