The role of serpentinite melanges in the unroofing of UHPM rocks: An example from the Western Alps of Italy: Chapter 6

By: , and 
Edited by: Robert G. Coleman

Links

Abstract

The ultrahigh pressure metamorphic rocks (UHPM) of the Dora-Maira continental massif are overlain by a stack of oceanic nappes. Metamorphic grade appears to increase downward but with marked discontinuities between each of the nappes, suggesting that section has been removed along the bounding faults. This apparent omission of section is greatest in the lowest oceanic unit where a serpentinite melange containing blocks and slabs of eclogite, metamorphosed at 12–19 kbar, lies on the UHPM rocks. We suggest that this serpentinite melange represents a highly attenuated upper mantle section that structurally overlay the UHP rocks during subduction. Similar serpentinite melanges are known from other high-pressure (HP) and UHPM areas and may have a similar origin.

Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title The role of serpentinite melanges in the unroofing of UHPM rocks: An example from the Western Alps of Italy: Chapter 6
DOI 10.1017/CBO9780511573088.007
Year Published 1995
Language English
Publisher Cambridge University Press
Contributing office(s) Geology, Minerals, Energy, and Geophysics Science Center
Description 24 p.
Larger Work Type Book
Larger Work Title Ultrahigh Pressure Metamorphism
First page 182
Last page 205