Results 41 to 50 of about 24,905 (235)

The nature of zircon in the Volkovsky massif gabbro (Middle Urals): the age problem and geochronological consequences

Литосфера, 2017
The article presents new isotope-geochemical data on zircon from gabbronorites of the Volkovsky massif in the Middle Urals. The massif is a complex combination of different rock associations - from ultramafic rocks to syenites and quartz diorites, whose ...
Elena V. Anikina, Artur A. Krasnobaev, Evgenii V. Pushkarev, Igor’ A. Rusin   +3 more
doaj   +1 more source

Polymict melt‐bearing breccia dikes in the Morokweng impact structure formed by slip‐induced mechanical mixing of pseudotachylite and cataclasite along large‐displacement impact faults

Meteoritics &Planetary Science, EarlyView.
Abstract A core drilled through shocked and faulted Archean granitoid gneisses and dolerites in the eroded peak ring of the 70–80 km diameter Morokweng impact structure intersects multiple centimeter‐ to meter‐wide clastic‐matrix breccias containing a polymict clast population of lithic and mineral clasts and altered, millimeter‐ to centimeter ‐size ...
Roger L. Gibson, S'lindile S. Wela, Leonidas C. Vonopartis, Marco A. G. Andreoli   +3 more
wiley   +1 more source

Confirming the impact origin of the São Miguel do Tapuio structure, northeastern Brazil

Meteoritics &Planetary Science, EarlyView.
Abstract The São Miguel do Tapuio structure (SMT) is a remarkable, nearcircular feature of about 21 km diameter, centered at 5°37.6′ S, 41°23.3′ W in Piauí state, northeastern Brazil. The structure is located within the sedimentary strata of the Paleozoic–Mesozoic Parnaíba Basin and predominantly comprises sandstones of the Devonian Pimenteiras and ...
Alvaro Penteado Crósta, Neivaldo Araújo de Castro, Marcos Alberto Rodrigues Vasconcelos, Airton Natanael Coelho Dias, Ludovic Ferrière, Wolf Uwe Reimold, Ana Maria Góes, Jackson Alves Martins, Liliana Sayuri Osako, Raimundo Mariano Gomes Castelo Branco   +9 more
wiley   +1 more source

New data on composition of intrusive rocks from Shikotan island (Lesser Kuril Chain)

Вестник Камчатской региональной ассоциации "Учебно-научный центр". Серия: Науки о Земле, 2019
The article presents new petrologic and geochemical data on gabbroids from Shikotan Island (Lesser Kuril Chain). The results were compared with co-magmatic Late Cretaceous-Paleocene volcanics from the Zelenov Formation, as well as with the rocks from the
Колосков А.В., Федоров П.И., Окина О.И.   +2 more
doaj   +1 more source

MEZOPROTEROZOIC BASITE MAGMATISM OF THE BASHKIRIAN MEGANTICLINORIUM (SOUTHERN URALS): AGE CONSTRAINTS, PETROLOGICAL AND GEOCHEMICAL FEATURES

Геодинамика и тектонофизика, 2020
Among the Riphean–Vendian dyke complexes of the basic composition, which intersect the Precambrian strata of the Bashkirian meganticlinorium (Southern Urals), one of the most common is the Kurgas gabbro-dolerite complex dated to the Early – Middle ...
A. O. Khotylev, A. V. Tevelev, Ya. V. Bychkova, A. V. Latyshev, M. B. Anosova   +4 more
doaj   +1 more source

Particle velocity experiments in anorthosite and gabbro [PDF]

, 1984
Shock wave experiments were conducted in San Gabriel anorthosite and San Marcos gabbra 10 11 GPa using a 40 mm-borne propellant gun. Particle velocities were measured directly at several points in each target by means of electromagnetic gauges.
Anderson, Cowperthwaite, Grady, Grady, Liebermann, Marsh, Rice   +6 more
core   +2 more sources

Geometrization of structural elements of the Southern section of the Bystriyivske gabbro deposit to determine rational directions of development

Технічна інженерія
The article deals with the issue of geometrization of structural elements of a gabbro deposit in order to improve the processes of its geological and economic assessment and determine the optimal directions of development.
V.G. Levytskyi, A.O. Kryvoruchko, G.V. Skyba, S.V. Kalchuk, S.M. Shyshko   +4 more
doaj   +1 more source

GABBROIDS OF PRE-JURASSIC BASEMENT OF ARCTIC AND THEIR SULFIDE MINERALIZATION (SYUNAY-SALIN AREA, YAMAL PENINSULA) [PDF]

Минералогия, 2019
The chemical and mineral composition of gabbroids of the pre-Jurassic basement of the Syunay-Salin area located in the Arctic part of the West Siberian megabasin on Yamal Peninsula is studied.
Yu.V. Erokhin, K.S. Ivanov, V.S. Bochkarev, V.S. Ponomarev, A.V. Zakharov   +4 more
doaj   +1 more source

MINERAL CHEMISTRY OF OPHIOLITIC GABBROS WITHIN CENTRAL ANATOLIA: HIRFANLI DAM GABBROS

SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings, 2019
The tectonic evolution of the magmatic rocks the Central Anatolia (CA) began at the late Mesozoic with closure of Neotethys in the region. The Central Anatolia has experienced several magmatic events including felsic and mafic intrusions originated from collisional and/or extensional tectonic events. The felsic magmatism of the CA are well reported and
Koralay, Tamer, Kadıoğlu, Yusuf Ka?an, Deniz, Kıymet, Güllü, Bahattin   +3 more
openaire   +2 more sources

Platinum-group element mineralisation in the Unst ophiolite, Shetland [PDF]

, 1984
The ophiolitic basic and ultrabasic rocks of the island of Unst, Shetland comprise a sequence of harzburgites, dunites, clinopyroxene-rich cumulates, and gabbro, within tectonic blocks that have been thrust over a migmatite complex during the Laxer ...
Gunn, A.G., Leake, R.C., Styles, M.T.
core