Crust-mantle interactions and granitoid diversification : insights from Archaean cratons /
edited by J. Halla, University of Helsinki, Finland, M.J. Whitehouse, Swedish Museum of Natural History, Sweden, T. Ahmad, Jamia Millia Islamia, India, and Z. Bagai, University of Botswana, Botswana.
Bok Engelsk
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| Opplysninger | Archaean granitoids: an overview and significance from a tectonic perspective -- Hafnium isotope constraints on the origin of Mesoarchaean andesites in southern West Greenland, North Atlantic Craton -- The tectonomagmatic significance of Neoarchaean variably alkali-enriched gabbro and diorite intrusions of the western Karelia Province -- Alkaline-rich quartz syenite intrusions of the Western Karelia subprovince -- Geochronology of Neoarchaean granitoids of the NW eastern Dharwar craton: implications for crust formation -- The diversification of granitoids and plate tectonic implications at the Archaean-Proterozoic boundary in the Bundelkhand Craton, Central India -- Petrogenesis of mafic magmatic enclaves of the Bundelkhand granitoids near Orchha, Central Indian shield: evidence for rapid crystallization -- The long (3.7-2.1 Ga) and multistage evolution of the Bug Granulite-Gneiss Complex, Ukrainian Shield, based on the SIMS U-Pb ages and geochemistry of zircons from a single sample -- Geochemical characterization and petrogenesis of mafic granulites from the Central Indian Tectonic Zone (CITZ) -- Metamorphic evolution of the Ilomantsi greenstone belt in the Archaean Karelia Province, eastern Finland.. - This Special Publication sheds light on crust formation and tectonic processes in early Earth by focusing on Archaean granitoids and related rocks from West Greenland in the North Atlantic Craton, Karelia Province of the Fennoscandian Shield, Eastern Dharwar and Bundelkhand cratons in the Indian Shield and Bug Complex of the Ukrainian Shield. Resulting from the IGCP-SIDA 599 project 'The Changing Early Earth', this compilation of papers provides explanations on the nomenclature of Archaean granitoids and explores the petrology, element and isotope geochemistry, geochronology and metamorphism of granitoids and supracrustal rocks of variable metamorphic grade. This volume provides information on the increase and timing of crust-mantle interactions and granitoid diversification from early Archaean protoliths of island arc origin to the emergence of multi-source high-K calc-alkaline granitoid batholiths at convergent continental margins. The formation of abundant granitoid batholiths suggests a significant change in mantle dynamics and plate tectonics towards the end of the Archaean.--
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| ISBN | 1-78620-299-9
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