Tectonics of the Arabian margin associated with the formation and exhumation of high-pressure rocks, Sultanate of Oman
Article Abstract:
Research into the structure and metamorphic zonation within the Saih Hatat window in north east Oman has involved integrating the results of new structural mapping within this window into results from previous mapping along the Ibra transect. The latest research indicates that there is a major structural break within northern Saih Hatat. This break divides the higher pressure blueschist and eclogite of As Sifah from upper plate rocks bearing carpholite and involving fold nappes developed in the pre-Permian basement and Hajar Supergroup. It appears that the formation and exhumation of high-pressure, low-temperature metamorphic rocks took a very long time.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1998
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Archaean granulites of the Limpopo Belt, Zimbabwe: one slow exhumation or two rapid events?
Article Abstract:
Petrographical and geochronological results from the granulites of Northern Marginal Zone of the Limpopo Belt, Zimbabwe, reveal a 620 Ma age difference between the thermal peak and low-grade retrogression. Two separate tectonometamorphic events were responsible for this difference. Geochronometers reveal evidence of isotopic disequilibrium among the retrograde assemblages. Possible tectonic settings are evaluated on the basis of the obtained results. The possibility of committing errors in tectonic interpretation by mixing ages of the two events is addressed.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1996
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SHRIMP U-Pb zircon dating of Archean core complex formation and pancratonic strike-slip deformation in the East Pilbara Granite-Greenstone Terrain
Article Abstract:
It has been possible to undertake sensitive high-resolution ion microprobe U-Pb zircon dating of granite rocks from the Shaw Granitoid Complex of the East Pilbara Granite-Greenstone Terrain. It was found that extension in the upper and middle crust was synchronous and linked with volumetrically extensive intrusion of tonalite-trondhjemite-granodiorite granitoids.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 2001
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