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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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Journal ArticleDOI
TL;DR: In this paper, high-resolution ion microprobe (SHRIMP) U-Pb zircon geochronology in the newly defined Warumpi Province of the southern Arunta Region, central Australia has identified a succession of granulite facies metasedimentary rocks (the Yaya Metamorphic Complex) that has undergone a polymetamorphic Proterozoic evolution.

103 citations

Journal ArticleDOI
TL;DR: In this paper, a large set of 40Ar/39Ar data has been obtained on the metamorphic soles and some ophiolite intrusives using single grains and bulk mineral populations.
Abstract: In the eastern Mediterranean region the Albanian ophiolites are remnants of one branch of the Tethyan oceanic basin obducted on carbonate margins during the Mesozoic. Pressure, temperature, time, and structural data in the metamorphic soles of these ophiolites place new constraints on the closure of this basin and the emplacement history of oceanic rocks. The petrological and structural work documents an “apparently inverted metamorphic gradient” with granulite facies at the top, decreasing downward through amphibolite, then greenschist facies until unmetamorphosed rocks. Thermobarometry indicates that the granulite facies formed at peak temperatures of 800°–860°C for pressures close to 1 Gpa. These conditions point to the subduction of the ophiolites beneath young oceanic lithosphere to a depth of 30–40 km. A large set of 40Ar/39Ar data has been obtained on the metamorphic soles and some ophiolite intrusives using single grains and bulk mineral populations. Ages range from 160 to 174 Ma, corresponding to the middle Jurassic (Bajocian-Bathonian). Within the same sole the convergence of results using single grains and mineral populations of amphibole and muscovite and the lack of internal age gradient within muscovite are interpreted to result from fast cooling of metamorphic soles. The main result documented by this study is a systematic younging of metamorphic sole ages from south to north, with a difference of 14 Ma along the 140 km length of the belt. The age of igneous rocks, such as plagiogranites and mafic dikes in the ophiolites, is equivalent to that of metamorphic soles, which indicates that the ophiolite was still hot and young at the time of metamorphic sole formation. The emplacement of the Albanian ophiolites is the consequence of a complex tectonic evolution: continental rifting, slow mid-ocean spreading followed by west dipping intraoceanic subduction initiated at the ridge axis, symmetric intraoceanic thrusting with opposite vergence, and at last, emplacement onto the continental margin. The geochronological and stratigraphic data suggest that this evolution lasted only a few million years. Moreover, they indicate that this evolution stopped earlier to the south with the closure of a narrow basin than to the north, where the basin was wider due to faster oceanic spreading.

103 citations

Journal ArticleDOI
TL;DR: In this article, the Athabasca granulite terrane and the thrust zone are cut by the Grease River shear zone, and the results provide evidence for a previously unrecognized >100m.y. episodic record of sub-horizontal NW-SE shortening and dextral shear strain along the Greas-River shear.

102 citations

Journal ArticleDOI
TL;DR: In this article, the authors show that the Guichicovi complex formed the metamorphic basement near the western edge of the Maya terrane in southern Mexico, and the results support the hypothesis that the Precambrian crust in Mexico together with the Colombian Andes and the Adirondacks originated during the mid-Proterozoic.

102 citations

Journal ArticleDOI
TL;DR: In this paper, the relationship between high-pressure metamorphic rocks and their later retrogression products have been preserved in-situ, and fluid-inclusion data suggest a simple correlation between metamorphism grade and metamorphics fluid composition.

102 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023126
2022301
2021177
2020203
2019148
2018142