LITHOSPHERE ASTHENOSPHERE INTERACTION DURING CONTINENTAL BREAKUP - PRELIMINARY ISOTOPIC DATA ON THE PASSIVE GALICIA MARGIN (NORTH-ATLANTIC)/

Authors
CHARPENTIER S KORNPROBST J CHAZOT G CORNEN G BOILLOT G
Citation
S. Charpentier et al., LITHOSPHERE ASTHENOSPHERE INTERACTION DURING CONTINENTAL BREAKUP - PRELIMINARY ISOTOPIC DATA ON THE PASSIVE GALICIA MARGIN (NORTH-ATLANTIC)/, Comptes rendus de l'Academie des sciences. Serie 2. Sciences de la terre et des planetes, 326(11), 1998, pp. 757-762
Citations number
16
Categorie Soggetti
Geosciences, Interdisciplinary
Journal title
Comptes rendus de l'Academie des sciences. Serie 2. Sciences de la terre et des planetes → ACNP
ISSN journal
12518050
Volume
326
Issue
11
Year of publication
1998
Pages
757 - 762
Database
ISI
SICI code
1251-8050(1998)326:11<757:LAIDCB>2.0.ZU;2-T
Abstract
The Galicia Margin ultramafic ridge has been cross-cut by diorites, py roxenites and gabbros before the end of the rifting stage, and then by dolerites, after the continental breakup; it has been further overlai d by basaltic lava flows. The younger the rocks, the higher the initia l epsilon(Nd) (2.2-8.8). This evolution would be the result of the con tamination of liquids; extracted from the asthenosphere, by the enrich ed (epsilon(Ndi) = 4.0) and partially melted previous continental lith osphere. Time-decreasing contamination is related to progressive litho spheric thinning from the end of rifting to the beginning of oceanic s preading. (C) Academie des sciences/Elsevier, Paris.