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Origin and Petrogenetic Implications of Spessartine Garnet in Highly-Fractionated Granite from the Central Eastern Desert of Egypt

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Acta Geologica Sinica(English Edition) 2020年第3期94卷 763-776页

作者： Mabrouk SAMI theodoros ntaflos Haroun A.MOHAMED Esam S.FARAHAT Christoph HAUZENBERGER Nasser M.MAHDY Khaled M.ABDELFADIL Douaa FATHY Geology Department Faculty of ScienceMinia UniversityEl-Minia 61519Egypt Department of Lithospheric Research University of ViennaAlthanstrasse 14A-1090 ViennaAustria Institute of Mineralogy and Petrology Karl-Franzens UniversityGrazAustria Nuclear Materials Authority P.O.530El-MaadiCairoEgypt Geology Department Faculty of ScienceSohag UniversityEgypt

A highly-fractionated garnet-bearing muscovite granite represents the marginal granitic facies of the Abu-Diab multiphase pluton in the Central Eastern Desert of Egypt. New electron microprobe analyses(EMPA) and laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS) data from garnets are reported, in order to constrain their origin and genesis. Garnet in the Abu-Diab host granite is euhedral to subhedral, generally homogeneous and, in rare cases, it shows weak zonation. The garnet contains appreciable amounts of MnO and FeO, with lesser amounts of MgO and CaO, yielding an end-member formula of Sps61–72Alm25–35Prp1–4Adr0–1. Moreover, it is depleted in large ion lithophile elements(LILE) with lower values of Ba, Nb and Sr relative to the primitive mantle. Additionally, it contains high concentrations of HREE and Y and their REE pattern shows strong negative Eu anomalies. The garnet was crystallized under relatively low temperature(646°C–591°C) and pressure(< 3 kbar) conditions. The textural and chemical features indicate that the garnet is magmatic in origin and is chemically similar to that from highly-fractionated A-type granite. It was probably formed at the expense of biotite in a highly-evolved MnO-rich magma and/or by hydroxyl complexing of Mn during the ascending fluid phases.

关键词： spessartine garnet LA-ICP-MS A-type granite Abu-Diab Egypt

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俄罗斯Chukchi半岛新生代碱性岩的形成和演化：熔体和流体包裹体证据

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岩石学报 2007年第1期23卷 83-92页

作者： Irina P.Solovova theodoros ntaflos Andrei Girnis Natalya N.Kononkova Vyacheslav V.Akinin Institute of Geology of Ore Deposits PetrographyMineralogyand Geochemistry35 StaromonetnyMoscow119017Russia Institute of Mineralogy University of ViennaAustria Vernadsky Institute of Geochemistry and Analytical Chemistry MoscowRussia Northeastern Interdisciplinary Research Institute MagadanRussia

Melt and fluid inclusions were studied in the minerals of Cenozoic olivine melanephelinites from the Chukchi Peninsula, *** rock contain several generations of olivine phenocrysts varying in composition at mg=0.88～*** phenocrysts bear fluid and melt inclusions recording various stages of melt crystallization in volcanic conduits and shallow magma *** fluid inclusions are CO_2-dominated with a density of up to O.93 g/cm^*** fluid inclusions are partially leaked,which is indicated by haloes of tiny fluid bubbles around large fluid inclusions in *** inclusions contain various daughter crystals,which were completely resorbed in thermometric experiments at about 1230℃.Assuming that this temperature corresponds to the entrapment conditions of the CO_2 fluid inclusions,the minimum pressure of the beginning of magma degassing is estimated as *** in the compositions of homogenized silicate melt inclusions indicate that olivine was the earliest crystalline phase followed by clinopyroxene,nepheline and *** sequence is in agreement with the mineralogy of the *** melts are strongly enriched in incompatible trace elements and volatiles(in addition to CO_2,high C1,F,and S contents were detected).There are some differences between the compositions of melts trapped in minerals from different *** in SiO_2,FeO,and incompatible element contents are probably related to melt generations at various levels in a homogeneous mantle reservoir.

关键词：俄罗斯Chukchi半岛新生代碱性岩形成演化熔体流体包裹体

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