Osmium isotopic evidence for ancient subcontinental lithospheric mantle beneath the Kerguelen Islands, southern Indian Ocean

Author(s): Hassler, Deborah R.; Shimizu, Nobumichi
Author Affiliation(s): Primary:
Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Volume Title: Science
Source: Science, 280(5362), p.418-421. Publisher: American Association for the Advancement of Science, Washington, DC, United States. ISSN: 0036-8075 CODEN: SCIEAS
Note: In English. 34 refs.; illus., incl. 1 table, sketch map
Summary: Upper mantle xenoliths found in ocean island basalts are an important window through which the oceanic mantle lithosphere may be viewed directly. Osmium isotopic data on peridotite xenoliths from the Kerguelen Is., an archipelago that is located on the northern Kerguelen Plateau in the southern Indian Ocean, demonstrate that pieces of mantle of diverse provenance are present beneath the Islands. In particular, peridotites with unradiogenic osmium and ancient rhenium-depletion ages may be pieces of the Gondwanaland subcontinental lithosphere that were incorporated into the Indian Ocean lithosphere as a result of the rifting process. (Auth.)
Year of Publication: 1998
Research Program: ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; Absolute age; Basalts; Dates; Gondwana; Igneous rocks; Inclusions; Indian Ocean; Indian Ocean Islands; Isotopes; Kerguelen Islands; Leg 119; Lithosphere; Mantle; Mantle plumes; Mesoproterozoic; Metals; ODP Site 738; Ocean Drilling Program; Ocean-island basalts; Os-188/Os-187; Osmium; Plate tectonics; Platinum group; Precambrian; Proterozoic; Re/Os; Rhenium; Stable isotopes; Subduction; Upper Precambrian; Upper mantle; Volcanic rocks; Xenoliths
Coordinates: S624233 S624232 E0824715 E0824714
Record ID: 1998031234
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States