The University of Southampton
University of Southampton Institutional Repository

Crustal trace of a hot convective sheet

Record type: Article

The Iceland plume has played an influential role in the evolution of the North Atlantic Ocean and margins over the past 60 m.y. It is believed that this plume formed at the conjunction of a tetrad of hot, subvertical, convective sheets. The impingement of these hot sheets at the base of the lithospheric lid caused decompressional melting, generating substantial quantities of high-temperature magma that were injected into the cold overlying lid. Over the next 10 m.y., these sheets partly coalesced to form a crudely axisymmetric plume head. Here we analyze the lithospheric fingerprint of one of these hot convective sheets. By forward and inverse modeling of densely sampled wide-angle seismic data, in conjunction with gravity observations, we determined the three-dimensional shape of magmatic underplating trapped within the lithosphere. The injection of this melt into the lithosphere generated substantial permanent and minor transient uplift of Earth's surface. Predicted and measured amounts of consequent denudation and sedimentation agree within error. Temporal variations in the patterns of deposition and oceanic circulation adjacent to the convective sheet show its evolution through time and space. Our results suggest that this linear sheet has probably been directly and indirectly responsible for cyclical events over 60 m.y. These events have 0.5–1 and 4–6 m.y. periodicities, the existence of which may help to elucidate the dynamic behavior of convective sheets during and after impingement. Thus, in particular circumstances, surficial geological processes yield an indirect record of mantle convection and melt-generation processes.

Full text not available from this repository.

Citation

Al-kindi, S., White, N., Sinha, M., England, R. and Tiley, R. (2003) Crustal trace of a hot convective sheet Geology, 31, (3), pp. 207-210. (doi:10.1130/0091-7613(2003)031<0207:CTOAHC>2.0.CO;2).

More information

Published date: 2003
Keywords: plumes, underplating, denudation, convection, wide-angle seismology

Identifiers

Local EPrints ID: 1232
URI: http://eprints.soton.ac.uk/id/eprint/1232
ISSN: 0091-7613
PURE UUID: 5983b294-5c55-4f06-9ef6-303cdab8124f

Catalogue record

Date deposited: 06 Apr 2004
Last modified: 17 Jul 2017 17:17

Export record

Altmetrics

Contributors

Author: S. Al-kindi
Author: N. White
Author: M. Sinha
Author: R. England
Author: R. Tiley

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×