University of Tasmania
Browse

File(s) under permanent embargo

Kerguelen hotspot magma output since 130 Ma

journal contribution
posted on 2023-05-17, 08:43 authored by Mike CoffinMike Coffin, Pringle, MS, Duncan, RA, Gladczenko, TP, Storey, M, Muller, RD, Gahagan, LA
The Kerguelen hotspot (Indian Ocean) has produced basalt for ¡­130 Myr, among the longest known volcanic records from a single source. New and published 40Ar/39Ar age determinations from the Kerguelen Plateau, Broken Ridge, Rajmahal Traps, and Bunbury basalts, and of Indian and Antarctic dikes help to document the hotspot¡¯s history. Using radiometric dates and crustal structure determined from geophysical data and drilling results, we calculate the magmatic output of the Kerguelen hotspot through time. Output rates have varied in ways not predicted by current geodynamic models; maximum eruption volumes postdate the initial surface manifestation of the hotspot as well as break-up between Antarctica and India by ¡Ã15 Myr, and magma output rates were high, as well as geographically diverse, over an interval of 25 Myr, from ¡­120 to ¡­95 Ma. We propose two alternatives to the standard mantle plume paradigm, one involving multiple plume sources, and another consisting of a single, but dismembered plume source.

History

Publication title

Journal of Petrology

Volume

43

Issue

7

Pagination

1121-1139

ISSN

0022-3530

Department/School

Institute for Marine and Antarctic Studies

Publisher

Oxford Univ Press

Place of publication

Great Clarendon St, Oxford, England, Ox2 6Dp

Rights statement

Copyright © Oxford University Press. The definitive publisher-authenticated version is available online at: http://www.oxfordjournals.org/

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the earth sciences

Usage metrics

    University Of Tasmania

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC