Journal
PRECAMBRIAN RESEARCH
Volume 229, Issue -, Pages 189-197Publisher
ELSEVIER
DOI: 10.1016/j.precamres.2012.05.004
Keywords
Plate tectonics; TTG; Craton; Archaean; Ophiolite; Shoshonite
Categories
Ask authors/readers for more resources
Bedard (2006) proposed that Archaean cratons formed above large, long-lived mantle plumes, where the thick basaltic crust cannibalized itself to generate TTGs (tonalite-trondhjemite-granodiorite) and complementary eclogitic restites. In this model the dense eclogitic restites foundered into the depleted upper mantle and refertilized it, triggering generation of new basaltic melt pulses, and so eclogite represents a catalyst for coupled crust-mantle differentiation. Since most of the eclogite is destroyed in the upper mantle, voluminous hidden eclogitic reservoirs are not predicted. The model was not intended to explain the generation of overprinting fabrics and terrane assembly, but to account for chemical evolution of the coupled crust-mantle system in the initial stages of craton development. Wyman (2013) argues that the models and hypotheses presented in Bedard (2006) are unrealistic and irrelevant, and reaffirms his opinion that the Archaean world was dominated by plate tectonics. The criticisms and arguments of Wyman (2013) are invalid. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available