Revisiting the Lanzo peridotite (NW-Italy): "Asthenospherization" of ancient mantle lithosphere

Détails

ID Serval
serval:BIB_2527DC19236C
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Revisiting the Lanzo peridotite (NW-Italy): "Asthenospherization" of ancient mantle lithosphere
Périodique
Ofioliti
Auteur(s)
Muntener O., Piccardo G.B., Polino R., Zanetti A.
ISSN-L
0391-2612
Statut éditorial
Publié
Date de publication
2005
Peer-reviewed
Oui
Volume
30
Pages
111-124
Langue
anglais
Résumé
In this paper, we compiled previous investigations and summarize recent
results to show that the Lanzo peridotite records a sequence of deep
lithospheric igneous events that largely obliterated the previous
subcontinental history. Field, microtextural and trace element data
indicate the progressive evolution of an igneous system that forms
above an upwelling asthenosphere, most probably during the transition
from a rifted system to the establishment of an (ultra-) slow spreading
ridge of the Piedmont Ligurian ocean. Pervasive porous flow of melt
forming `reactive' spinel peridotites followed by plagioclase
peridotite is later replaced by focused porous flow, reflected by a
system of replacive harzburgite and dunites. Cooling of the Lanzo
peridotite leads to the interstitial crystallization of clinopyroxene
and plagioclase, and finally to the formation of gabbro dikes. Thus,
the Lanzo peridotites may indicate that extension-driven
`as-thenospherization' of lithospheric mantle is an important process
in the development of embryonic ocean basins.
Création de la notice
17/04/2009 23:56
Dernière modification de la notice
20/08/2019 13:03
Données d'usage