Results 1 to 10 of about 657 (114)

Compositional Data Analysis (CoDA) of Clinopyroxene From Abyssal Peridotites

Geochemistry, Geophysics, Geosystems, 2022
We analyze a large database of abyssal peridotite clinopyroxene compositions using log‐ratio transformation, principal component analysis (PCA) and k‐means clustering, to better understand clinopyroxene compositional systematics in abyssal peridotites ...
Pedro Waterton, Kristoffer Szilas, Tomoaki Morishita   +2 more
exaly   +2 more sources

Clinopyroxene Dissolution Records Rapid Magma Ascent [PDF]

Frontiers in Earth Science, 2020
Magma ascent rates control volcanic eruption styles. However, the rates at which basaltic magmas ascend through the crust remain highly uncertain. Although recent studies have successfully exploited records of decompression driven degassing to estimate ...
David A. Neave, John Maclennan
doaj   +4 more sources

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

THE “CLINOPYROXENE” PALEOGEOTHERM BENEATH THE OBNAZHENNAYA KIMBERLITE PIPE AND THIСKNESS OF LITHOSPHERE UNDER THE KUOYKA FIELD (SIBERIAN CRATON, YAKUTIA)

Геодинамика и тектонофизика, 2022
The mantle paleogeotherm under the Obnazhennaya kimberlite pipe (Kuoika field, Siberian craton) was reconstructed using the chemical composition of clinopyroxene xenocrystals and the FITPLOT program.
E. A. Muravjeva, A. M. Dymshits, I. S. Sharygin, A. V. Golovin, A. M. Logvinova, O. B. Oleinikov   +5 more
doaj   +1 more source

Application of Clinopyroxene Chemistry for Investigation of the physical conditions of ascending magma, a case study of volcanic rocks in the Aliabad area (Northwest of Nain)

Journal of Economic Geology, 2020
Introduction The Aliabad area is located in the northwest of Nain. Volcanic rocks of the Aliabad area have andesitic to rhyolitic composition. On the basis of petrographic investigations, porphyritic texture is the main texture of these rocks.
Rezvan Mehvari, Mortaza Sharifi
doaj   +1 more source

Clinopyroxene Crystals in Basic Lavas of the Marsili Volcano Chronicle Early Magmatic Stages in a Back-Arc Transcrustal Mush System

Geosciences, 2021
Constraining the pre-eruptive processes that modulate the chemical evolution of erupted magmas is a challenge. An opportunity to investigate this issue is offered by the interrogation of the crystals carried in lavas.
Teresa Trua, Michael P. Marani
doaj   +1 more source

PHYSICO-CHEMICAL CONDITIONS OF CRYSTALLIZATION OF MINERALS-PHENOCRYSTS IN BASALTIC COMPLEXES HOSTING MASSIVE SULFIDE DEPOSITS OF THE URALS AND SIBERIA [PDF]

Минералогия, 2020
The paper discusses the physico-chemical formation conditions of minerals-phenocrysts in basaltic complexes, which host massive sulfide deposits of the Urals and Siberia. It is found as a result of study of melt inclusions that clinopyroxene from basalts
V.A. Simonov, V.V. Maslennikov
doaj   +1 more source

An olivine-clinopyroxene geothermometer

Contributions to Mineralogy and Petrology, 1976
The olivine-clinopyroxene (Fe-Mg partition) geothermometer of Powell and Powell (1974) was derived on the basis of clinopyroxene mixing parameters which imply a large miscibility gap in CaFeSi2O6-CaMgSi2O6-CaAl2SiO6 clinopyroxenes at 950° C. Application of the Powell and Powell thermometer in an empirical way (ignoring likely errors in mixing ...
Powell, Roger, Powell, Marjorie
openaire   +1 more source

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

Brazilian 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, Rogério Guitarrari Azzone, Luanna Chmyz, Vincenza Guarino, Nicholas Machado Lima   +4 more
doaj   +1 more source

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

Frontiers 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, Han Zhao, Han Zhao, Xin-Miao Zhao, Xin-Miao Zhao, Xin-Miao Zhao, P. J. Le Roux, Wen Zhang, Hao Wang, Hao Wang, Hao Wang, Lie-Wen Xie, Lie-Wen Xie, Lie-Wen Xie, Chao Huang, Chao Huang, Chao Huang, Shi-Tou Wu, Shi-Tou Wu, Shi-Tou Wu, Jin-Hui Yang, Jin-Hui Yang, Jin-Hui Yang, Fu-Yuan Wu, Fu-Yuan Wu, Fu-Yuan Wu, Yue-Heng Yang, Yue-Heng Yang, Yue-Heng Yang   +28 more
doaj   +1 more source