ASCENDING SUBDUCTED OCEANIC-CRUST ENTRAINED WITHIN MANTLE PLUMES

Authors
Citation
A. Yasuda et T. Fujii, ASCENDING SUBDUCTED OCEANIC-CRUST ENTRAINED WITHIN MANTLE PLUMES, Geophysical research letters, 25(10), 1998, pp. 1561-1564
Citations number
27
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary
ISSN journal
0094-8276
Volume
25
Issue
10
Year of publication
1998
Pages
1561 - 1564
Database
ISI
SICI code
0094-8276(1998)25:10<1561:ASOEWM>2.0.ZU;2-1
Abstract
Upward migration of subducted oceanic crust from deep in the upper man tle is discussed based on high-pressure experimental data. Numerical c alculation reveals that a subducted oceanic crust, which is negatively buoyant in the present upper mantle, can ascend from the transition z one and be observed as a discrete magma source at the surface only whe n it has been broken into fragments comparable in dimension with its t hickness and involved in a solid diapir of heated peridotite. For exam ple, a solid diapir of heated peridotite with a temperature excess of 200 degrees C can contain up to 15 similar to 20 vol% of fragments of oceanic crust when it passes through the upper mantle, and it may caus e extensive basaltic volcanism at the surface.