Topic
Granulite
About: Granulite is a research topic. Over the lifetime, 6763 publications have been published within this topic receiving 268925 citations.
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TL;DR: In this paper, the trace element concentrations of granulite and amphibolite facies were analyzed for major elements and trace elements Rb, Sr, Ba, Zr, Pb, Th and U.
119 citations
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TL;DR: Diamond and coesite were discovered in-situ as inclusions in garnet, kyanite and zircon in high-pressure granulites from the northern Bohemian Massif.
Abstract: Diamond and coesite were discovered in-situ as inclusions in
garnet, kyanite and zircon in high-pressure granulites from
northern Bohemian Massif. These continental crustal rocks were
therefore subducted to depths of c. 140 km, which also explains
their common association with mantle garnet-bearing
peridotites. Models involving crustal thickening for these
high-pressure granulites need to be significantly modified.
Whole Variscan belt with numerous HP granulite occurrences can
represent a large ultrahigh-pressure terrain.
119 citations
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TL;DR: U-Pb isotopic analyses of zircons from a distinctive suite of previously undated granulite facies metaplutonic rocks, here termed the Western Fiordland Orthogneiss (WFO), in New Zealand, indicate synkinematic magmatic emplacement between ∼120 and 130 Ma ago.
Abstract: U-Pb isotopic analyses of zircons from a distinctive suite of previously undated granulite facies metaplutonic rocks, here termed the Western Fiordland Orthogneiss (WFO), in Fiordland, southwest New Zealand, indicate synkinematic magmatic emplacement between ∼120 and 130 Ma ago. These rocks were previously interpreted as possibly being of Precambrian age. Initial Pb and Sr ratios are consistent with arc/subduction related magmagenesis with little or no involvement of ancient continental crust. Subsequent high pressure (>12 kb) metamorphism of the WFO may reflect a major collision event involving crustal thickening by overthrusting of a >15 km thick sequence. Metamorphism ceased ≤116 Ma ago based on206Pb/238U ages of zircon from a retrogressed granulite. U-Pb isotopic analysis of apatite, along with previously published Rb/Sr mineral ages, indicate that final uplift and cooling to <300–400° C was largely completed by ∼90 Ma. The average uplift rate during this period is inferred to have been in excess of 1 mm/yr. Unmetamorphosed gabbronorites of the Darran Complex in eastern Fiordland, inferred by some investigators to be the granulite protolith, yield concordant U/Pb zircon ages of 137±1 Ma. U-Pb ages of apatite, and previously published K/Ar mineral ages indicate that these rocks experienced a rapid and simple cooling history lasting only a few million years. The high-grade WFO and unmetamorphosed Darran Complex are now separated by a profound structural break. However, the ages and similarities in initial Pb and Sr isotopic ratios suggest that both suites are products of the same Early Cretaceous cycle of subduction-related magmatism. The timing of Early Cretaceous magmatism and metamorphism, collision and resultant crustal thickening, and subsequent great uplift and erosion in Fiordland has important implications for terrane accretion and the evolution of relative plate motions along the New Zealand segment of the Gondwana margin.
119 citations
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TL;DR: The Kalinjala Shear Zone as mentioned in this paper is an ∼200 km long high-grade dextral transpressional shear zone that formed during the ∼1730-1700 Ma Kimban Orogeny (KD1 and KD2).
119 citations
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TL;DR: In this article, the uppermost allochthon in the Variscan belt of NW Spain has been studied and it is shown that the hangingwall to the suture includes a pre-Variscan tectonothermal unit.
119 citations