Results 61 to 70 of about 5,875 (167)

Thermal contraints on high-pressure granulite metamorphism of supracrustal rocks [PDF]

open access: yes
The circumstances leading to the formation and exposure at the Earth's surface of supracrustal granulites are examined. These are defined as sediments, volcanics, and other rock units which originally formed at the surface of the Earth, were ...
Ashwal, L. D., Leslie, W. W., Morgan, P.
core   +1 more source

Effects of water and fluorine on the viscosity of albite melt at high pressure: a preliminary investigation [PDF]

open access: yes, 1985
The viscosities of fluorine- and water-bearing melts based on albite composition have been determined at 7.5, 15 and 22.5 kbar by the falling-sphere method. All melt viscosities decrease isothermally with increasing pressure.
Arndt   +41 more
core   +1 more source

Electron Microprobe Chemical Dating of Uraninite as a Reconnaissance Tool for Leucogranite Geochronology [PDF]

open access: yes, 2007
We suggest that electron microprobe techniques may be employed to date Tertiary samples of uraninite (UO~2~), which can contain very high concentrations of radiogenic Pb after only a few million of years of U and Th decay. Although uraninite is regarded
Jahandar Ramezani   +4 more
core   +1 more source

Late Archean crust-​mantle interactions: geochemistry of LREE-​enriched mantle derived magmas. Example of the Closepet batholith, southern India [PDF]

open access: yes, 1995
The Closepet batholith in South India is generally considered as a typical crustal granite emplaced 2.5 Gyr ago and derived through partial melting of the surrounding Peninsular Gneisses (3.3-​3.0 Gyr)​. In the field, it appears as a composite batholith
Jayananda, M.   +3 more
core   +1 more source

Rapid endogenic rock recycling in magmatic arcs. [PDF]

open access: yesNat Commun, 2021
Li JY   +8 more
europepmc   +1 more source

Regional significance of volcanic geochemistry in the Far Triple Junction, Ethiopia [PDF]

open access: yes
Regional significance of volcanic geochemistry in far Triple Junction ...
Mohr, P. A.
core   +1 more source

Crustal growth: Some major problems [PDF]

open access: yes
Fundamental problems with models currently used to explain the genesis and evolution of continental crust were raised. These problems focus around the difficulty of generating the upper continental crust from a lower crustal or mantle protolith without ...
Arculus, R. J.
core   +1 more source

Thermal constraints on the emplacement rate of e large intrusive complex : the Manaslu Leucogranite, Nepal Himalaya.

open access: yes, 2006
International audienceThe emplacement of the Manaslu leucogranite body (Nepal, Himalaya) has been modelled as the accretion of successive sills. The leucogranite is characterized by isotopic heterogeneities suggesting limited magma convection, and by a ...
Annen, Catherine   +2 more
core   +4 more sources

Discusión sobre el matamorfismo regional del Guadarrama oriental (Sistema Central español) [PDF]

open access: yes, 1971
Se aportan datos que confirman que el metamorfismo del Guadarrama oriental corresponde al tipo distena-sillimanita, con un desarrollo zona1 que tiene grandes analogías con el trictaniorfismo barrowiense.
Fuster Casas, José María   +1 more
core   +1 more source

Geology of Byobu Rock and Gobanme Rock, Prince Olav Coast, East Antarctica [PDF]

open access: yes, 2006
We report here the geology of Byobu Rock and Gobanme Rock outcrops hitherto unmapped in the Prince Olav Coast, East Antarctica. Both these outcrops expose high-grade metamorphic and igneous rocks.
M. Satish-Kumar   +3 more
core   +1 more source

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