Results 1 to 10 of about 237 (117)

Investigation of rock genesis and geodynamic significance based on Sr–Yb granite classification and geochemical characteristics: A case study from Guangxi, China [PDF]

open access: yesHeliyon
The intrusive bodies in the study area are categorized into two intrusive units, γπK2 and ηoπK2, based on rock structure characteristics and intrusive contact relationships.
Hongbing Wang   +4 more
doaj   +2 more sources

Thermal buffering-controlled temperature variation between Mg–Al-rich rocks and migmatites [PDF]

open access: yesScientific Reports
It is well recognised that endothermic processes such as dehydration and partial melting have the potential to exert measurable effects on the maximum temperatures reached in metamorphic rock systems.
Samantha March   +3 more
doaj   +2 more sources

Different Cooling Histories of Ultrahigh-Temperature Granulites Revealed by Ti-in-Quartz: An Electron Microprobe Approach

open access: yesCrystals, 2023
The cooling history of granulite is crucial to understanding tectonic scenarios of the continental crust. Ti-in-quartz, a useful indicator of temperature, can decipher the thermal evolution of crustal rocks.
Di Zhang   +6 more
doaj   +1 more source

Boron abundance and localization in granulites and the lower continental crust [PDF]

open access: yesBulletin of the Geological Society of Finland, 1986
Fifty-five Precambrian ultramafic to felsic granulites from Pikwitonei, Westport, Adirondack Mountains, Orissa, Madras, and Minnesota and granulite xenoliths from Montana have been analyzed by Prompt Gamma Neutron Activation Analysis and alpha-track ...
M.G. Truscott, D.M. Shaw, J.J. Cramer
doaj   +1 more source

P–T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION

open access: yesГеодинамика и тектонофизика, 2021
The study is focused on metapelitic granulites of Cape Kaltygei (Western Baikal region) that contain a diagnostic mineral assemblage of ultrahigh temperature (UHT) metamorphic rocks (orthopyroxene+sillimanite+quartz).
N. I. Volkova   +5 more
doaj   +1 more source

What happened to the Early Precambrian granulite complexes of the Bug region (Ukrainian shield) and the Limpopo belt (South Africa) and how to stratify them? A tectonist’s view

open access: yesГеофизический журнал, 2022
The author reviews two alternative approaches (stratigenic-metamorphogenic and deformation-metamorphogenic) to the geology and mapping of the Earth’s oldest crust rocks that were metamorphized in РТ-conditions of the granulite facies, on the examples of
O.B. Gintov
doaj   +1 more source

A COMBINED MODEL OF THE DIAPIRIC AND COLLISIONAL FORMATION MECHANISM OF THE PALEOPROTEROZOIC GRANITE-MIGMATITE-GNEISS DOMES OF THE SVECOFENNIAN BELT

open access: yesГеодинамика и тектонофизика, 2023
Geological examples of the development of thermal dome structures in the Svecofennian belt demonstrate the relationship between plutonic and metamorphic events and metamorphic strengthening towards the core parts of the structures.
O. P. Polyansky   +2 more
doaj   +1 more source

Dating the Sedimentary Protolith of the Daldyn Group Quartzite, Anabar Shield, Russia: New Detrital Zircon Constraints

open access: yesGeosciences, 2020
Quartzites and paragneisses of the Archean granulite series of the Anabar Shield (Siberian Craton, Russia) are described geochemically. The Sm-Nd isotope systematics of the rocks and the U-Pb age (SHRIMP II) and geochemistry of zircons from quartzites ...
Nikolay I. Gusev   +2 more
doaj   +1 more source

Evolution of migmatitic granulite complexes: Implications from Lapland Granulite Belt, Part I: Metamorphic geology [PDF]

open access: yesBulletin of the Geological Society of Finland, 2006
The Palaeoproterozoic Lapland granulite belt was juxtaposed between Archaean and Proterozoic terrains in the NE part of the Fennoscandian Shield concurrently with the accretion of Svecofennian arc complexes at ~1.9 Ga.
P. Tuisku, P. Mikkola, H. Huhma
doaj   +1 more source

Structural evolution of the Vuotso area, Finnish Lapland [PDF]

open access: yesBulletin of the Geological Society of Finland, 2003
The Vuotso area is structurally interesting because the fold interference pattern in rocks of central Lapland changes into thrust-related foliation of the Lapland Granulite Belt.
M. Nironen, I. Mänttäri
doaj   +1 more source

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