Results 21 to 30 of about 26,385 (251)

Mineralogy of anorthosite veins and host gabbros in the Kal-e-Kafi intrusive body (northeast of Anarak, Isfahan Province, Central Iran)

open access: yesJournal 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   +2 more
doaj   +1 more source

Platinum Group Element Traces of CAMP Volcanism Associated With Low‐Latitude Environmental and Biological Disruptions

open access: yesGeophysical Monograph Series, Page 263-304., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Jessica H. Whiteside   +3 more
wiley  

+3 more sources

Experimental determination of plagioclase dissolution rates as a function of its composition and pH at 22°C. [PDF]

open access: yes, 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

Mineral reaction and deformation in Plagioclase-Olivine composites : an experimental study [PDF]

open access: yes, 2004
Deformation and metamorphism of rocks are fundamentally interrelated but the ways in which processes of reaction and deformation mutually influence each other are still poorly understood in natural rocks.
Ronde, Almar A. de
core   +1 more source

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

open access: yesپترولوژی, 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   +3 more
doaj   +1 more source

Isotopic Compositions of Plagioclase From Plutonic Xenoliths Reveal Crustal Assimilation Below Martinique, Lesser Antilles Arc

open access: yesFrontiers in Earth Science, 2021
The chemical and isotopic compositions of volcanic arc lavas often show evidence for involvement of a sedimentary component during magma genesis. Determining where this sedimentary component is added to arc magmas is of vital importance for constraining ...
J. R. Brown   +5 more
doaj   +1 more source

Micro-Raman spectroscopy of plagioclase and maskelynite in Martian meteorites: Evidence of progressive shock metamorphism [PDF]

open access: yes, 2005
P(論文)We present the first systematic Micro-Raman spectroscopic investigation of plagioclase of different degree of shock metamorphism in Martian meteorites. The equilibrium shock pressure of all plagioclase phases of seventeen unpaired Martian meteorites
Fritz,Jorg   +2 more
core   +1 more source

Plagioclase as evidence of magmatic evolution in the Zafarqand porphyry copper deposit, NE Isfahan

open access: yesJournal of Economic Geology, 2018
Introduction Chemical and textural zoning patterns preserved in plagioclase phenocrysts can provide useful information on parameters that constrains the changing melt compositions in the magma systems.
Maryam Aminoroayaei Yamini   +3 more
doaj   +1 more source

Deformation-facilitated melting of plagioclase

open access: yes, 2022
International audienceGeological processes involving deformation and/or reactions are highly influenced by the rock grain size, especially if diffusion-controlled processes take place such as long-range metamorphic reactions and diffusion creep. Although
Baïsset, Marie   +3 more
core   +1 more source

Investigating the relative adsorption of polymeric depressants on pure minerals [PDF]

open access: yes, 2011
The aim of this study was to investigate the relative adsorption of polymeric depressants on pure minerals. The minerals used were talc, pyroxene, plagioclase, chromite and chalcopyrite and the depressants used were guar gum and carboxymethyl cellulose ...
Mhlanga, Sabatha Sanele
core   +1 more source

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