Sinking intrusion model for the emplacement of garnet-bearing peridotites into continent collision orogens: comment and reply
Article Abstract:
Hannes K. Brueckner has provided a summary of the distribution and significance of garnet peridotites in the Western Gneiss region, Norway. However, his overall tectonic model has some faults. This is with regards to the Proterozoic garnet-pyroxene Sm-Nd mineral isochrons reported in the largest peridotite body at Almklovdalen. The model assumes that crust and mantle interact tectonically in a location where Baltica crust comes in contact with hot mantle of the Laurentian plate. Reasonal thermal models would predict temperatures of 1100-1300 C which is too high for Proterozoic garnet mineral isochrons to exist.
Publication Name: Geology
Subject: Earth sciences
ISSN: 0091-7613
Year: 1999
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Lithospheric gravitational potential energy and past orogenesis: implications for conditions of initial Basin and Range and Laramide deformation: comment and reply
Article Abstract:
Craig H. Jones et al. used a simplified analysis of the function of gravitational body forces to evaluate the origin of initial extensions in the Great and Range. They assumed a constant average density of the crust during deformation which may not truly represent reality. Considering the range of crustal thickness suggested for the Great Basin before the Tertiary extension, it is most likely that the lower crust was at least partially eclogitized, and therefore has a higher density.
Publication Name: Geology
Subject: Earth sciences
ISSN: 0091-7613
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
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