Results 11 to 20 of about 19,778 (275)

Miarolitic cavities in rapakivi granite on Hästholmen, Loviisa, southeastern Finland [PDF]

Bulletin of the Geological Society of Finland, 1987
Miarolitic cavities are described from drill cores taken from rapakivi granite on Hästholmen, an island about 80 km east of Helsinki. The distribution of cavities between different textural types of rapakivi seems to favour the equigranular medium to ...
K. Lindqvist, V. Suominen
doaj   +1 more source

In-situ Sr isotope disequilibrium in plagioclases from Late Cenozoic basalts in Leiqiong area: Evidence for the role of the Hainan plume and mantle metasomatism due to a paleo-subduction event

Frontiers in Earth Science, 2023
The origin of the EM2 (enriched mantle 2)-type reservoir beneath the Southeast Asia is controversial. In this study, we present new in-situ major and trace element (olivine, clinopyroxene, and plagioclase), and Sr isotopic compositions (plagioclase) for ...
Shuang-Shuang Chen, Shuang-Shuang Chen, Shuang-Shuang Chen, Shuang-Shuang Chen, Duo-Yang Wu, Duo-Yang Wu, Duo-Yang Wu, Rui Gao, Rui Gao, Rui Gao, Qiuming Cheng, Qiuming Cheng, Jia-Qi Liu   +12 more
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Mineralogy of anorthosite veins and host gabbros in the Kal-e-Kafi intrusive body (northeast of Anarak, Isfahan Province, Central Iran)

Journal of Economic Geology, 2022
Introduction In the northeastern part of the Isfahan province and 65 km northeast of the Anarak city (Kal-e-Kafi area), an I-type granitoid pluton cross cut the Paleozoic metamorphic rocks and Eocene volcanic rocks. In the contact of this granitoid body
Hanan Salim, Ghodrat Torabi , Nargess Nosouhian   +2 more
doaj   +1 more source

Variation of plagioclase shape with size in intermediate magmas: a window into incipient plagioclase crystallisation [PDF]

Contributions to Mineralogy and Petrology, 2022
AbstractVolcanic rocks commonly display complex textures acquired both in the magma reservoir and during ascent to the surface. While variations in mineral compositions, sizes and number densities are routinely analysed to reconstruct pre-eruptive magmatic histories, crystal shapes are often assumed to be constant, despite experimental evidence for the
Martin F. Mangler, Madeleine C. S. Humphreys, Fabian B. Wadsworth, Alexander A. Iveson, Michael D. Higgins   +4 more
openaire   +4 more sources

Geothermobarometry of Sarmeshk granitoids in the Northwest of Sarduiyeh [PDF]

پترولوژی, 2018
The Sarmeshk granitoid pluton is located in southeast of the Urumieh-Dokhtar magmatic zone in the Kerman province. Based on petrographic studies, the granitoid consist of three rock type of diorite, granodiorite and monzogranite. They are mainly composed
Asma Nazarinia, Seyed Mohsen Mortazavi, Mohsen Arvin, Mohammad Poosti   +3 more
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Dependence of the Hydration of the Lunar Surface on the Concentrations of TiO₂, Plagioclase, and Spinel

Remote Sensing, 2021
We investigate the interrelation between the hydration of the lunar regolith and the mineral composition of the surface of the Moon with respect to the concentrations of plagioclase, TiO2 (highly correlated with the oxide mineral ilmenite), and Mg-spinel.
Marcel Hess, Christian Wöhler, Alexey A. Berezhnoy, Janice L. Bishop, Vladislav V. Shevchenko   +4 more
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Experimental determination of plagioclase dissolution rates as a function of its composition and pH at 22°C. [PDF]

, 2014
The steady-state, far-from-equilibrium dissolution rates of nine distinct plagioclases ranging in composition from An2 to An89 were measured in mixed flow reactors at 22 ± 2 C and pH from 2 to 11.
Gudbrandsson S., Wolff-Boenisch D., Gislason S. R. and Oelkers E. H.
core   +1 more source

Features of olivine crystallization in ordinary chondrites (Saratov meteorite): geochemistry of trace and rare earth elements

Записки Горного института, 2022
The paper discusses the geochemistry of major (EPMA) and trace (SIMS) elements in olivine of porphyritic, nonporphyritic chondrules, and the matrix of equilibrated ordinary chondrite Saratov (L4).
Kristina G. Sukhanova, Anton B. Kuznetsov, Olga L. Galankina   +2 more
doaj   +1 more source

Petrology, geochemistry, source and tectonic setting of Malek Chah Ruii granitoid (East of Lut Block) [PDF]

پترولوژی, 2021
The Malek Chah Rouii granitoid pluton is exposed within the Deh-Salm metamorphic complex in the eastern margin of the Lut zone. The studied granitoid with peraluminous and calc-alkaline nature is composed of tonalite, granodiorite, and granite (monzo ...
Abadullah Toulabi Nejad, Ahmad Ahamadi Khalaji, Mohammad Ebrahimi, Habib Biabangard, Rasoul Esmaeili   +4 more
doaj   +1 more source

Partitioning of barium between coexisting K-feldspars and plagioclase in the Bushveld granites from the Zaaiplaats area, South Africa [PDF]

Bulletin of the Geological Society of Finland, 1984
The barium contents of the coexisting K-feldspars and plagioclases in the Bushveld granites from the Zaaiplaats tin mine area were determined by electron microprobe analyses.
J.T. Ollila
doaj   +1 more source