Results 31 to 40 of about 8,675 (209)

Contribution of ultramafic rocks in central Sanandaj-Sirjan zone to the characterizing of physio-chemical condition during initiation of subduction [PDF]

پترولوژی, 2018
In the central part of the Sanandaj-Sirjan zone, there is an ultramafic rock exposure (hornblendite and pyroxenite) adjacent to Molataleb felsic complex completely located between Azna and Aligoodarz towns.
Amir Esna-Ashari, Fatemeh Sarjoughian
doaj   +1 more source

Olivine-chrome-spinel equilibrium in chromitites and ultramafites of Rai-Iz massif, Polar Urals

Литосфера, 2016
Olivine and chrome-spinel compositions from chromitites and ore-bearing metamorphosed ultramafic rocks of Rai-Iz massif were compared. It was established that olivine and spinel ferruginosity are directly proportional and increase monotonically from ...
P. B. Shirjaev, N. V. Vakhrusheva
doaj   +2 more sources

Petrogenetic processes in the ultramafic, alkaline and carbonatitic magmatism in the Kola Alkaline Province: a review

, 2005
Igneous rocks of the Devonian Kola Alkaline Carbonatite Province (KACP) in NW Russia and eastern Finland can be classified into four groups: (a) primitive mantle-derived silica-undersaturated silicate magmas; (b) evolved alkaline and nepheline syenites; (
Balaganskaya, Elena, Demaiffe, Daniel, Beard, Andrew D., Demaiffe, D., Beard, Andrew, Downes, Hilary, Balaganskaya, E., Beard, Andy, Liferovich, R., Liferovich, Ruslan   +9 more
core   +1 more source

Massive production of abiotic methane during subduction evidenced in metamorphosed ophicarbonates from the Italian Alps

Nature Communications, 2017
Alteration of ultramafic rocks plays a role in hydrocarbon production, but little is known about this process at depth. Here, the authors provide evidence that alteration of carbonated ultramafic rocks at high-pressures are an important source of abiotic
Alberto Vitale Brovarone, Isabelle Martinez, Agnès Elmaleh, Roberto Compagnoni, Carine Chaduteau, Cristiano Ferraris, Imène Esteve   +6 more
doaj   +1 more source

Geochemistry and tectonic setting of the supracrustal rocks from the central part of the Bundelkhand craton, India

JGEET: Journal of Geoscience, Engineering, Environment and Technology, 2019
Supracrustal rocks (mafics and ultramafics) occurs along with banded iron formation, and felsic volcanics around Babina, Dhaura, and Mauranipur linear east-west trends in central part of the Bundelkhand craton represent Archean crust.
M. M. Singh, Vinod K. Singh
doaj   +1 more source

A neoproterozoic age for the chromitite and gabbro of the Tapo Ultramafic Massif, Eastern Cordillera, Central Peru, and its tectonic implications

, 2011
The ultramafic-mafic rocks of the Tapo Complex are exposed in the Eastern Cordillera of the Central Peruvian Andes. This complex is composed of serpentinised peridotites and metabasites with some podiform chromitite lenses and chromite disseminations and
Acosta, Jorge, Pereira, Eurico, Tassinari, Colombo Celso Gaeta, Jose F. Rodrigues, Rodrigues, Jose F., Eurico Pereira, Ricardo Castroviejo, Castroviejo Bolibar, Ricardo, Acosta Ale, Jorge Gilberto, Tassinari, Colombo G., Jorge Acosta, Colombo C.G. Tassinari, Rodrigues, José Feliciano   +12 more
core   +1 more source

Reflectance spectroscopy and analytical techniques in characterising PGE-bearing host rocks

Geosystems and Geoenvironment, 2023
The Mettuppalaiyam mafic and ultramafic complex (MUC) is part of the Southern Granulite terrain in India. MUC is one of the promising sites for Ni-Cu-Cr and Platinum Group of Elements (PGE) mineralisation.
K. Tamilarasan, S. Anbazhagan, S. Ranjithkumar   +2 more
doaj   +1 more source

(Table 6) Concentrations of trace elements in ultramafic rocks from the Markov Deep, Central Atlantic

, 2006
(Table 6) Concentrations of trace elements in ultramafic rocks from the Markov Deep, Central ...
Sergey G Skolotnev (6958661), Skolotnev, Sergey G, Peyve, Alexander A, Nikolay S Bortnikov (6961571), Alexander A Peyve (6958658), G N Savelyeva (6886064), Bortnikov, Nikolay S, Savelyeva, G N   +7 more
core   +1 more source

Origin of magnetic fabrics in ultramafic rocks [PDF]

IOP Conference Series: Materials Science and Engineering, 2015
ISSN:1757 ...
Biedermann, Andrea; id_orcid0000-0001-9819-6969, Kunze, Karsten; id_orcid0000-0003-4682-8017, Zappone, Alba S., Hirt, Ann Marie; id_orcid0000-0002-2193-0472   +3 more
openaire   +4 more sources

西南日本の熱変成超苦鉄質岩体中のかんらん石と輝石の組成変化に関する覚書

, 2010
This short article presents some diagrams showing the compositional variations of primary and metamorphic olivine, orthopyroxene and clinopyroxene in peridotites and serpentinites from thermally metamorphosed ultramafic complexes in SW Japan. In contrast
Nozaka, Toshio
core   +1 more source