Submarine basalts of the northern Kerguelen Plateau; interaction between the Kerguelen Plume and the Southeast Indian Ridge revealed at ODP Site 1140

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doi: 10.1093/petrology/43.7.1287
Author(s): Weis, Dominique; Frey, Frederick A.
Author Affiliation(s): Primary:
Université Libre de Bruxelles, Département des Sciences de la Terre et de l'Environnement, Brussels, Belgium
Other:
Massachusetts Institute of Technology, United States
Volume Title: Journal of Petrology
Source: Journal of Petrology, 43(7), p.1287-1309. Publisher: Oxford University Press, Oxford, United Kingdom. ISSN: 0022-3530 CODEN: JPTGAD
Note: In English. 52 refs.; illus., incl. 3 tables, sketch map
Summary: Pillow basalts from the extreme N of the Kerguelen Plateau prove Kerguelen submarine eruptions for the first time. Each flow has distinct chemical and isotopic properties that in total range from the Southeast Indian Ridge (SEIR) MORB to tholeiitic-transitional basalts derived from the Kerguelen mantle plume, with mixing of near-primary melts from an SEIR source and the Kerguelen plume. Modelling shows the depleted SEIR component is dominant. The 29 m.y. tholeiitic-transitional basalts show incorporation of asthenospheric mantle by the plume on its way to the surface. Proximity of the spreading centre and plume allowed mixing of diverse magmas. The Cainozoic N Kerguelen Plateau appears oceanic in origin and lacks continental crust. Major, trace, REE, and Sr, Nb and Pb isotopic analyses of basalts are listed.
Year of Publication: 2002
Research Program: ODP Ocean Drilling Program
Key Words: 05 Petrology, Igneous and Metamorphic; Basalts; Continental crust; Crust; Igneous rocks; Indian Ocean; Kerguelen Plateau; Leg 183; Mid-Indian Ridge; ODP Site 1140; Ocean Drilling Program; Southeast Indian Ridge; Submarine volcanoes; Tholeiitic basalt; Volcanic rocks; Volcanoes
Coordinates: S461536 S461536 E0682930 E0682930
Record ID: 2003010536
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom