U-Pb geochronology and evolution of the English River Subprovince, an Archean low P-high T metasedimentary belt in the Superior Province
Article Abstract:
Magmatic and tectonic collections in the greenstone-granite Uchi Subprovince, from 2720 to 2710 Ma, deposited turbiditic metasedimentary rocks in the English River Subprovince (ERS). ERS is a late Archean low P-high T metasedimentary belt in the Superior Province, the Canadian Shield. Thermal perturbations are responsible for occurrence of quick changes in ERS. The presence of granitic magmas, produced by partial melting of the lower crust, causes the perturbations. The study is carried using U-Pb isotopic data.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1995
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Thermomechanical evolution of a ductile duplex
Article Abstract:
The reconstruction of the thermomechanical evolution of a midcrustal ductile duplex in central Australia is based on super40Ar/super39Ar thermochronology, cross-sectional restoration, microstructural analysis and flow stress estimates. The dating of white micas in quartzite mylonites is significant in the analysis, and the time-temperature history of the duplex is constrained via multidomain thermal modeling, which shows that a temperature gradient existed throughout the duplex during formation.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1997
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Geochronology and isotopic character of ultrahigh-pressure metamorphism with implications for collision of the Sino-Korean and Yangtze cratons, central China
Article Abstract:
U-Pb zircon geochronological and isotopic geochemical data suggest that ultrahigh-pressure metamorphism occurred during the initial collision of the Sino-Korean and Yangtze cratons in central China. Unlike the Sm-Nd system, both the Rb-Sr and U-Pd were open systems during the metamorphism. The crystallization of ultrahigh-pressure rocks occurred in a rift environment from 700 to 800 Ma. During subduction the crust was present as a coherent slab as the rocks exhibit crustal signatures.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1996
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