Results 81 to 90 of about 1,741 (196)

High- and Ultrahigh-Pressure Metamorphism in the North Qaidam and South Altyn Terranes, Western China [PDF]

open access: yes, 2007
The North Qaidam and South Altyn terranes extend approximately 1000 km across the northern Tibetan Plateau, and five localities preserve evidence of Early Paleozoic high-pressure (HP) or ultrahigh-pressure (UHP) metamorphism, including the presence of ...
Bird, D. K.   +3 more
core   +2 more sources

Fluid‐Driven Mass Transfer During Retrograde Metamorphism and Exhumation of the UHP Western Gneiss Region Terrane, Norway

open access: yesGeochemistry, Geophysics, Geosystems
Dehydration reactions within subducted oceanic crust are important for fluid‐mediated element transfer within the subducting plate and potentially to the mantle wedge.
D. Z. Shulaker   +3 more
doaj   +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

Uncertainties and shortcomings of ground surface temperature histories derived from inversion of temperature logs [PDF]

open access: yes, 2005
Analysing borehole temperature data in terms of ground surface history can add useful information to reconstructions of past climates. Therefore, a rigorous assessment of uncertainties and error sources is a necessary prerequisite for the meaningful ...
Hartmann, Andreas, Rath, Volker
core   +1 more source

METABASITES OF MIDDLE TRANSANGARIA, YENISEI RIDGE: E-MORB RELICTS OF NEOPROTEROZOIC LITHOSPHERE

open access: yesLITOSFERA, 2017
This work presents first results on40Ar/39Ar dating by stepwise heating method, as well as geochemistry of rare trace elements by ICP-MS and isotopic (Nd, Sr) composition of metabasites from tributaries basins of Velmo and Bolshoi Pit rivers (Transangaria, Yenisei ridge). The studied rocks form small areas of concordant boudined plate-shape amphibolite
Vasilii V. Vrublevskii   +3 more
openaire   +3 more sources

Neoproterozoic crustal evolution in Southern Chad: Pan-African ocean basin closing, arc accretion and late- to post-orogenic granitic intrusion. [PDF]

open access: yes, 2006
International audienceIn the Lake Léré region, southern Chad, Neoproterozoic terrains are distributed in four lithostructural groups that reveal the geotectonic evolution of a part of the Pan-African orogenic domain.
Doumnang, J.C.   +4 more
core   +3 more sources

Geochemistry and petrogenesis of metabasites from the KTB ultradeep borehole, Germany

open access: yesGeologische Rundschau, 1997
The metabasites from the KTB pilot and main drill holes can be divided into two major associations. The first is the metagabbro-amphibolite suite which is composed principally of metagabbros, basalts, and basaltic andesites with tholeiitic P-MORB affinities.
Harms, U.   +3 more
openaire   +4 more sources

The Murchison Greenstone Belt, South Africa: Accreted slivers with contrasting metamorphic conditions [PDF]

open access: yes, 2013
International audienceThis paper presents new petrological and geochronological data for the ∼3.09-2.92 Ga Murchison Greenstone Belt (MGB), located in South Africa's Kaapvaal Craton, and discusses their geotectonic implications.
Block, Sylvain   +5 more
core   +3 more sources

Tectonics and Petrograpby of the East Ongul Islana, Lutzow-Holm Bukt, Antarctica [PDF]

open access: yes, 1964
The East Ongul Island on the coast of the Lutzow-Holm Bukt, East Antarctica, was investigated from the tectonical and petrographical points of view.
Koshiro KIZAKI   +1 more
core   +1 more source

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