Granulite Research Papers - Academia.edu (original) (raw)

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Recent papers in Granulite

The formation of continents involves a combination of magmatic and metamorphic processes. These processes become indistinguishable at the crust-mantle interface, where the pressure-temperature (P-T) conditions of (ultra) high-temperature... more

The formation of continents involves a combination of magmatic and metamorphic processes. These processes become indistinguishable at the crust-mantle interface, where the pressure-temperature (P-T) conditions of (ultra) high-temperature granulites and magmatic rocks are similar. Continents grow laterally, by magmatic activity above oceanic subduction zones (high-pressure metamorphic setting), and vertically by accumulation of mantle-derived magmas at the base of the crust (high-temperature metamorphic setting). Both events are separated from each other in time; the vertical accretion postdating lateral growth by several tens of millions of years. Fluid inclusion data indicate that during the high-temperature metamorphic episode the granulite lower crust is invaded by large amounts of low H 2 O-activity fluids including high-density CO 2 and concentrated saline solutions (brines). These fluids are expelled from the lower crust to higher crustal levels at the end of the high-grade metamorphic event. The final amalgamation of supercontinents corresponds to episodes of ultra-high temperature metamorphism involving large-scale accumulation of these low-water activity fluids in the lower crust. This accumulation causes tectonic instability, which together with the heat input from the sub-continental lithospheric mantle, leads to the disruption of supercontinents. Thus, the fragmentation of a supercontinent is already programmed at the time of its amalgamation. Ó 2015, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

New SHRIMP U–Pb zircon ages combined with Sm–Nd isotopic characteristics of granulites and associated granitic rocks of the Anápolis–Itauçu Complex in the central-southern part of the Brası́lia Belt are presented and discussed in this... more

New SHRIMP U–Pb zircon ages combined with Sm–Nd isotopic characteristics of granulites and associated granitic rocks of the Anápolis–Itauçu Complex in the central-southern part of the Brası́lia Belt are presented and discussed in this study. Igneous crystallization ages obtained in zircon grains of orthogranulite and granites vary between 760 and 650Ma. Growth of new zircon at ca. 650–640Ma dates the

The 1.4 Ga Bondy gneiss complex (BGC) is one of a series of gneiss complexes that outcrops as tectonic domes structurally below Grenvillian, 1.3–1.25 Ga, marble and quartzite assemblages in the Central Metasedimentary Belt (CMB) of... more

The 1.4 Ga Bondy gneiss complex (BGC) is one of a series of gneiss complexes that outcrops as tectonic domes structurally below Grenvillian, 1.3–1.25 Ga, marble and quartzite assemblages in the Central Metasedimentary Belt (CMB) of Québec, western Grenville Province. The complex comprises a variety of tonalitic to granitic orthogneiss intercalated with thin units of layered metabasite and laminated felsic

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