Results 1 to 10 of about 387 (119)

GEOLOGICAL SETTING AND GENESIS OF THE KURMANSKY GABBRO-TRONDHJEMITE MASSIF (MIDDLE URALS) [PDF]

open access: yesГеодинамика и тектонофизика, 2022
This paper reports the results of petrogeochemical studies of the Kurmansky gabbro-trondhjemite massif (eastern slope of the Middle Urals), lying in the western part of the large Reftinsky allochthonous block within the accretion East Uralian megazone ...
S. V. Pribavkin   +2 more
doaj   +2 more sources

Petrogenesis and crustal evolution of the Tasiast TTG suite (SW Reguibat Shield, Mauritania). Implication for crustal growth in the West African craton [PDF]

open access: yesComptes Rendus. Géoscience, 2021
The Mauritanian Tasiast unit in the Southwestern Reguibat Archean Shield (North of the West African craton $=$ WAC) consists mainly of gneiss dated between 3.07 and 2.91 Ga.
El Abd Bouha, Mohamed   +4 more
doaj   +2 more sources

Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil [PDF]

open access: yesBrazilian Journal of Geology, 2022
Orthopyroxene-bearing tonalites/trondhjemites with scarce quartz diorites comprise the Café enderbite that crops out in three Neoarchean plutons in the central portion of the Canaã dos Carajás domain, Carajás Province, northern Brazil.
Bhrenno Marangoanha   +4 more
doaj   +1 more source

Introducing Carbonatites of ‌Bafq Metallogenic Area, Central Iran, Economic Geology of the REEs based on petrology and geochemistry, Unique geodynamic model of continental arc changed to rift in Early Cambrian

open access: yesJournal of Economic Geology, 2022
Carbonatites are among the rare kind of rocks on this planet. These igneous rocks are included by share of more than 50% carbonate minerals; dolomite, calcite & ankerite.
Saeed Kolahdani
doaj   +1 more source

Submagmatic to Solid-State Deformation Microstructures Recorded in Cooling Granitoids during Exhumation of Late-Variscan Crust in North-Eastern Sicily

open access: yesGeosciences, 2020
Late-Variscan granitoid rocks of trondhjemitic and granitic composition, intruded in migmatitic paragneisses in the north-eastern Peloritani Mountains (southern Italy) at ~310 Ma and ~300 Ma, respectively, exhibit a range of deformation microstructures ...
Eugenio Fazio   +3 more
doaj   +1 more source

Genesis of the Eastern Adamello Plutons (Northern Italy): Inferences for the Alpine Geodynamics

open access: yesGeosciences, 2021
The Corno Alto–Monte Ospedale magmatic complex crops out at the eastern border of the Adamello batholith, west of the South Giudicarie Fault (NE Italy).
Alessio Relvini   +6 more
doaj   +1 more source

The Paleoarchean and Mesoarchean TTGs of the western Azov area, the Ukrainian Shield

open access: yesДоповiдi Нацiональної академiї наук України, 2021
A large anticline structure occurs in the western part of the Azov Domain of the Ukrainian Shield. It is composed of rocks of the Mesoarchean (3.2-3.0 Ga) granite-greenstone association and relics of an older basement.
G.V. Artemenko, L.V. Shumlyanskyy
doaj   +1 more source

Origin and geodynamic evolution of the Archean crust of eastern Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 1984
The Archaean crust of eastern Finland is composed of three main lithological units: ‒ Gneissic basement. It was originally composed of tonalites, trondhjemites and granodiorites emplaced at 2.86 G.a. and 2.62 G.a.
H. Martin   +8 more
doaj   +1 more source

Petrological and structural analysis of the Haukivesi area between Varkaus and Savonlinna, Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 1971
The Haukivesi area is part of a Precambrian orogenic belt. Its supracrustal rocks can be regarded as having been deposited in a geosynclinal system consisting of an eugeosynclinal basin in the northern and central Haukivesi area and a miogeosynclinal ...
G. Gaál, E. Rauhamäki
doaj   +1 more source

A Summary of the Precambrian Granitoid Rocks of the Kruger National Park

open access: yesKoedoe: African Protected Area Conservation and Science, 1986
Precambrian granitoid rocks underlie approximately 60 percent of the Kruger National Park. They occur primarily in the western portion of the park and comprise a wide variety of rock including granites, granodiorites, tonalites, trondhjemites and ...
J.M. Barton, J.W. Bristow, F.J. Venter
doaj   +1 more source

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