Results 71 to 80 of about 45,840 (156)

Plagioclase Zoning and Sr Isotopes Constrain Mush–Magma Mixing in the Late Triassic Xiuyan Granitic Pluton, East China

open access: yesGeosciences
Mafic microgranular enclaves (MMEs) are widespread in granitic plutons and provide valuable insights into mush–magma mixing processes in crustal magma reservoirs.
Zisong Zhao   +4 more
doaj   +1 more source

Petrology of Oligocene Ghaleh Yaghmesh granitoids in the west of Yazd province

open access: yesJournal of Economic Geology, 2017
Introduction The generation and evolution of granitic magmas has been a hot debated subject among petrologists. The diversity of their origin has led different authors to propose that these rocks are not simple in their origin and might be generated in
Bahareh Fazeli   +4 more
doaj   +1 more source

Amphibole zoning, a record of progressive oxidation during crystallization of mafic microgranular enclaves in the Kurobegawa Granitic Pluton

open access: yesJournal of Mineralogical and Petrological Sciences, 2003
Sulfide, oxide, and amphibole in MME (mafic microgranular enclaves) in the young Kurobegawa Granitic Pluton (2 Ma) indicate that their textural and mineralogical features are characteristic of progressively oxidized magnetite-series granitoids. Hydrous mafic magma intruded into the chamber from the bottom and fragmented to form MME, subsequently ...
YAMAGUCHI, Yoshiaki   +3 more
openaire   +2 more sources

Petrography and mineral chemistry of the Eocene granodiorites in the Toveireh area (Southwest of Jandaq, Isfahan province)

open access: yesJournal of Economic Geology, 2019
Introduction Granitoids are the most common igneous rocks that are found in all parts of the continental crust and play an important role in the formation and evolution of the Earth’s continental crust (Clarke, 1992).
Masumeh Sargazi, Ghodrat Torabi
doaj   +1 more source

Petrogenesis and U-Pb and Sm-Nd geochronology of the Taquaral granite: record of an orosirian continental magmatic arc in the region of Corumba - MS

open access: yesBrazilian Journal of Geology
The Taquaral Granite is located on southern Amazon Craton in the region of Corumbá, westernmost part of the Brazilian state of Mato Grosso do Sul (MS), near Brazil-Bolivia frontier.
Letícia Alexandre Redes   +3 more
doaj   +1 more source

Diachronous Eocene-Oligocene granitoid magmatism in the southeastern part of the Urumieh-Dokhtar magmatic arc, Mardehak area, Jebal-e-Barez, Jiroft [PDF]

open access: yesپترولوژی
IntroductionThe Zagros orogeny occurred through four main geodynamic events of the Wilson cycle, leading to the formation of the Neotethys oceanic basin: (i) intracontinental rifting in the Carboniferous, (ii) oceanic basin development in the Permian ...
Raziyeh Moradi   +3 more
doaj   +1 more source

Geochemistry of the magmatic microgranular enclaves of Wadi Rahaba area, Southern Sinai, Egypt [PDF]

open access: yes, 2008
The study of the magmatic microgranular enclaves (MMEs) as relics of mafic magmas gives important information on the origin of parent magmas and their evolution.
El-Gharbawy Rasmy Ismail   +3 more
core  

Model for the Origin and Significance of Microgranular Enclaves in Calc-alkaline Granitoids

open access: yes, 1991
The origin and significance of microgranular enclaves as indicators of the occurrence of magma mixing and/or mingling episodes between basic magmas and anatectic acid magmas, either I- or S-type, are re-evaluated.
POLI, Giampiero, S. Tommasini
core   +1 more source

Textural Relations of Lamprophyric Mafic Microgranular Enclaves and Petrological Implications for the Genesis of Potassic Syenitic Magmas: the example of Piquiri Syenite, southern Brazil [PDF]

open access: yes, 2002
The Neoproterozoic Piquiri Syenite exhibits a large amount of mafic microgranular enclaves (MME) with elliptical-shape and millimeter to centimeter-size dimensions.
CID, JORGE PLÁ   +2 more
core   +1 more source

Geochemical and structural characterization of the Cruzeiro do Sul Granodiorite: neoproterozoic post-collisional shoshonitic magmatism within transcurrent shear zone, Quitéria region, Southernmost Brazil [PDF]

open access: yesGeologia USP. Série Científica, 2012
The Cruzeiro do Sul Granodiorite is located in the Eastern portion of the Sul-rio-grandense shield. It forms one ENE-WSW elongate body of approximately 4 km² within a sinistral strike slip shear zone.
Daniel Knijnik   +4 more
doaj  

Home - About - Disclaimer - Privacy