Results 21 to 30 of about 9,703 (232)

Mafic macrocrysts of ultrabasic alkaline dikes from the Mantiqueira Range, SE, Brazil: tracers of a complex plumbing system

open access: yesBrazilian Journal of Geology, 2020
Macrocryst assemblages of porphyritic alkaline dikes in the Mantiqueira range (SE Brazil) are mainly composed of clinopyroxene and olivine with different origins.
Júlio César Lopes da Silva   +4 more
doaj   +1 more source

ThiloBissbort/Hydrogen-clinopyroxene-equilibration: Hydrogen Clinopyroxene Equilibration

open access: yes, 2022
This supplementary material contains all MATLAB© programs that have been written to model non-isothermal diffusion of hydrogen in clinopyroxene along geotherms (P-T-fO2 path)
ThiloBissbort
core   +1 more source

Environmental Effects of Volcanic Volatile Fluxes From Subaerial Large Igneous Provinces

open access: yesGeophysical Monograph Series, Page 103-116., 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.
Tamsin A. Mather, Anja Schmidt
wiley  

+1 more source

Natural Clinopyroxene Reference Materials for in situ Sr Isotopic Analysis via LA-MC-ICP-MS

open access: yesFrontiers in Chemistry, 2020
Clinopyroxene is a major host mineral for lithophile elements in the mantle lithosphere, and therefore, its origin is vital for constraints on mantle evolution and melt generation. In situ Sr isotopic measurement of clinopyroxene has been available since
Han Zhao   +28 more
doaj   +1 more source

Crystallization conditions of two adjacent epidote + diopside-bearing granitic stocks, northeastern Brazil

open access: yesAnais da Academia Brasileira de Ciências, 2021
The Tamboril and Olho d’Água granitic stocks are part of the abundant calc-alkalic magmatic epidote-bearing granitic rocks in the Cachoeirinha–Salgueiro Terrane (CST) in the Transversal Zone Domain, northeastern Brazil. The equigranular Olho d’Água stock
RENAN SIQUEIRA   +2 more
doaj   +1 more source

Retrogression of ultrahigh-pressure eclogite, Western Gneiss Region, Norway [PDF]

open access: yesEuropean Journal of Mineralogy, 2023
The Western Gneiss Region (WGR) in western Norway exposes ultrahigh-pressure (UHP) eclogites that occur repeatedly, within an area of high-pressure (HP) eclogites, without evidence of being separated by tectonic shear or ductile flow structures.
D. Spengler   +4 more
doaj   +1 more source

Estimation of physicochemical properties and tectonic environment of gabbro masses from‏ ‏south of Germi city (Ardabil province)‎ based on the chemistry of clinopyroxene crystals [PDF]

open access: yesپترولوژی, 2018
The studied gabbroic rocks, trending northwest- southeast, outcropped in the south of Germi, northwest of Iran. These rocks composed of plagioclase, clinopyroxene and iddingsitic olivines.
gholamreza ahmadzadeh   +1 more
doaj   +1 more source

PHYSICO-CHEMICAL PARAMETERS OF MINERAL-FORMING PROCESSES IN PEGMATITES OF THE ILMENOGORSK ALKALINE COMPLEX (SOUTH URALS) AND ALTAI-SAYANY REGION (SOUTH SIBERIA) [PDF]

open access: yesМинералогия, 2020
The conditions of mineral formation in non-granite pegmatites of the Urals and Siberia are examined. The physico-chemical parameters of the crystallization of minerals in miaskite-pegmatites of the Ilmenogorsk alkaline complex (South Urals) and ...
V.A. Simonov
doaj   +1 more source

Zoned Pyroxenes as Prospectivity Indicators for Magmatic Ni-Cu Sulfide Mineralization

open access: yesFrontiers in Earth Science, 2020
Small intrusions dominated by olivine- and pyroxene-rich cumulates are well known to be favorable hosts to magmatic Ni-Cu-(Platinum Group Element—PGE) sulfide mineralization.
Louise Schoneveld   +8 more
doaj   +1 more source

Hydrogen Diffusion in Clinopyroxene at Low Temperatures (195°C–400°C) and Consequences for Subsurface Processes

open access: yesGeochemistry, Geophysics, Geosystems, 2022
Studying diffusion of hydrogen in nominally anhydrous minerals, like clinopyroxene, at low temperatures is a challenging task due to experimental and analytical difficulties.
Thilo Bissbort   +3 more
doaj   +1 more source

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