Results 41 to 50 of about 3,223 (190)

Rb-Sr Geochronology and Geochemical Characteristics of Mafic Dikes in the Nova Lacerda and Conquista D´Oeste Region, Mato Grosso, SW Amazonian Craton [PDF]

open access: yesGeologia USP. Série Científica, 2009
In the Nova Lacerda and Conquista D’Oeste regions, Mato Grosso State, SW part of the Amazonian Craton, mafi c dikestrending NNW intrude the Nova Lacerda Granite (1462 ± 12 Ma), within the Jauru Domain, in the Rondonia-San IgnacioProvince (1.55 - 1.3 Ga).
Amarildo Salina Ruiz   +3 more
doaj  

Provenance study of detrital garnets and rutiles from basaltic pyroclastic rocks of Southern Slovakia (Western Carpathians)

open access: yesGeologica Carpathica, 2018
Detrital garnets and rutiles have been recovered from basaltic pyroclastic rocks in the northern part of the Pannonian Basin and characterized using electron probe microanalysis and imaging.
Nemec Ondrej, Huraiová Monika
doaj   +1 more source

The paleotectonic evolution of the western Mediterranean: provenance insights from the internal Betics, southern Spain

open access: yesFrontiers in Earth Science, 2022
Since the early Cenozoic, the closure of the Alpine Tethys in the Western Mediterranean has been accomplished by protracted subduction, followed by collision and orogenic collapse.
Eirini M. Poulaki, Daniel F. Stockli
doaj   +1 more source

Eclogite facies relics in metabasites from the Sierra de Guadarrama (Spanish Central System): P-T estimations and implications for the Hercynian evolution [PDF]

open access: yes, 2000
Relics of HP-MT eclogitic assemblages related to the first metamorphic stage of the Hercynian orogeny in the Sierra de Guadarrama (Spanish Central System, SCS) are preserved as boudins of pre-Ordovician metabasites enclosed by felsic gneisses. Textures
Barbero González, Luis C.   +1 more
core  

High-pressure Ca metasomatism of metabasites (Mont Avic, Western Alps): insights into fluid–rock interaction during subduction [PDF]

open access: yesEuropean Journal of Mineralogy
The study of rock chemistry is a milestone in understanding fluid–rock interactions and fluid migration in subduction zones. When combined with thermodynamic models, it can provide direct insight into fluid composition, metasomatic reactions, and ...
K. Lecacheur   +6 more
doaj   +1 more source

Geology of the Region around Botnneset, East Antarctica (Earth Sciences) [PDF]

open access: yes, 1975
Geological observations of the Botnneset region, and mineral and chemical compositions of the rock samples collected from the region are presented in this article. The structural and metamorphic history of the region is summarized as follows.
Masaru YOSHIDA
core   +1 more source

El contacto entre las zonas de Ossa Morena y Sudportuguesa. Características y significado de la banda metamórfica de Aracena, en su sector central entre Aroche y Aracena (Huelva) [PDF]

open access: yes, 2004
El contacto entre las zonas de Ossa Morena y Sudportuguesa está subrayado por la banda metamórfica de Aracena. Las características principales de esta región del macizo Ibérico pueden considerarse desde distintos puntos de vista: litológico, estructural,
Castro, A.   +5 more
core   +1 more source

PERMIAN STRATIGRAPHY AND FUSULINIDS FROM ROSH GOL (CHITRAL, E HINDU KUSH)

open access: yesRivista Italiana di Paleontologia e Stratigrafia, 2017
Chitral (Pakistan), geologically, includes the eastern termination of the Hindu Kush and its transition to the Karakorum. The position of the boundary is not precisely defined, and may be located provisionally at the Chitral Fault, or at the Tirich Mir ...
MAURIZIO GAETANI, ERNST LEVEN
doaj   +1 more source

Chlorite composition and geothermometry: a comparative HRTEM/AEM-EMPA-XRD study of Cambrian basic lavas from the Ossa Morena Zone, SW Spain [PDF]

open access: yes, 2002
15 páginas, 8 figuras, 4 tablasChlorites from Cambrian basaltic vesicular lavas, characterized by relatively high Xc (0.81–0.98), gave temperatures of formation of 285 to 350°C (Cathelineau’s empirical geothermometer).
López-Munguira, Aurora   +2 more
core   +1 more source

Geochemistry and Petrogenesis of metabasites from the Gol-e-Gohar Complex in southern Sanandaj-Sirjan metamorphic zone, South of Iran; Evidences for crustal extension and magmatism at early Palaeozoic

open access: yesGeologica Acta, 2018
In Gol-e-Gohar metamorphic Complex from south-eastern Sanandaj-Sirjan metamorphic zone (Kerman province, Iran), there are two types of metabasites contain layered metamorphosed lava flows and the younger meta-gabbros.
H. FATEHI, H. AHMADIPOUR
doaj  

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