Petrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib–Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry

This contribution deals with new geology, petrography, and bulk-rock/mineral chemistry of the poorly studied ultramafics of Wadi Ibib–Wadi Shani (WI–WS) district, South Eastern Desert, Egypt. These ultramafics are dismembered ophiolitic rocks that can be subdivided into serpentinites and serpentiniz...

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Autores principales:	El Saeed R. Lasheen, Gehad M. Saleh, Farrage M. Khaleal, Mamdooh Alwetaishi
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	serpentinization element mobility partial melting forearc affinity Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/567973c1bead493191285341426aea0e
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spelling	oai:doaj.org-article:567973c1bead493191285341426aea0e2021-11-25T16:30:44ZPetrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib–Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry10.3390/app1122105242076-3417https://doaj.org/article/567973c1bead493191285341426aea0e2021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/22/10524https://doaj.org/toc/2076-3417This contribution deals with new geology, petrography, and bulk-rock/mineral chemistry of the poorly studied ultramafics of Wadi Ibib–Wadi Shani (WI–WS) district, South Eastern Desert, Egypt. These ultramafics are dismembered ophiolitic rocks that can be subdivided into serpentinites and serpentinized peridotites. Primary minerals such as olivine and pyroxene are absent in serpentinites, but relics of them occur in serpentinized peridotites. Pseudomorph after olivine is indicated by common hourglass textures with less mesh, whilst schistose bastites reflect a pyroxene pseudomorph. Chromite can be subdivided into Cr-spinel and Al-spinel. Cr-spinel ranges from chromite to magnesochromite in composition, whereas Al-spinel belongs to the spinel field. Cr-spinel includes YCr (Cr/(Cr+Al+Fe<sup>+3</sup>), YAl (Al/(Al+Cr+Fe<sup>+3</sup>), and YFe<sup>+3</sup> (Fe<sup>+3</sup><b>/</b>(Fe<sup>+3</sup>+Al+Cr), similar to forearc peridotite, whilst Al-spinel is more similar to abyssal peridotite, and may be formed during inanition of subduction processes in proto forearc environments. The main secondary minerals are tremolite, talc, and chlorite—which is subdivided into pycnochlorite and diabantite—and their temperature ranges from 174 to 224 °C. The examined rocks had undergone high partial melting degrees (>25%), as indicated by the Cr# of their unaltered cores (Cr-spinel, >0.6), whole rocks (Al<sub>2</sub>O<sub>3,</sub> SiO<sub>2</sub>, CaO, and MgO), trace and REEs, depleted Na<sub>2</sub>O, Al<sub>2</sub>O<sub>3</sub>, and Cr<sub>2</sub>O<sub>3</sub> of clinopyroxene, and high forsterite content ((Fo = 100 Mg/Mg + Fe), av. 95.23 mol%), consistent with forearc settings.El Saeed R. LasheenGehad M. SalehFarrage M. KhalealMamdooh AlwetaishiMDPI AGarticleserpentinizationelement mobilitypartial meltingforearc affinityTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10524, p 10524 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	serpentinization element mobility partial melting forearc affinity Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	serpentinization element mobility partial melting forearc affinity Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 El Saeed R. Lasheen Gehad M. Saleh Farrage M. Khaleal Mamdooh Alwetaishi Petrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib–Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry
description	This contribution deals with new geology, petrography, and bulk-rock/mineral chemistry of the poorly studied ultramafics of Wadi Ibib–Wadi Shani (WI–WS) district, South Eastern Desert, Egypt. These ultramafics are dismembered ophiolitic rocks that can be subdivided into serpentinites and serpentinized peridotites. Primary minerals such as olivine and pyroxene are absent in serpentinites, but relics of them occur in serpentinized peridotites. Pseudomorph after olivine is indicated by common hourglass textures with less mesh, whilst schistose bastites reflect a pyroxene pseudomorph. Chromite can be subdivided into Cr-spinel and Al-spinel. Cr-spinel ranges from chromite to magnesochromite in composition, whereas Al-spinel belongs to the spinel field. Cr-spinel includes YCr (Cr/(Cr+Al+Fe<sup>+3</sup>), YAl (Al/(Al+Cr+Fe<sup>+3</sup>), and YFe<sup>+3</sup> (Fe<sup>+3</sup><b>/</b>(Fe<sup>+3</sup>+Al+Cr), similar to forearc peridotite, whilst Al-spinel is more similar to abyssal peridotite, and may be formed during inanition of subduction processes in proto forearc environments. The main secondary minerals are tremolite, talc, and chlorite—which is subdivided into pycnochlorite and diabantite—and their temperature ranges from 174 to 224 °C. The examined rocks had undergone high partial melting degrees (>25%), as indicated by the Cr# of their unaltered cores (Cr-spinel, >0.6), whole rocks (Al<sub>2</sub>O<sub>3,</sub> SiO<sub>2</sub>, CaO, and MgO), trace and REEs, depleted Na<sub>2</sub>O, Al<sub>2</sub>O<sub>3</sub>, and Cr<sub>2</sub>O<sub>3</sub> of clinopyroxene, and high forsterite content ((Fo = 100 Mg/Mg + Fe), av. 95.23 mol%), consistent with forearc settings.
format	article
author	El Saeed R. Lasheen Gehad M. Saleh Farrage M. Khaleal Mamdooh Alwetaishi
author_facet	El Saeed R. Lasheen Gehad M. Saleh Farrage M. Khaleal Mamdooh Alwetaishi
author_sort	El Saeed R. Lasheen
title	Petrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib–Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry
title_short	Petrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib–Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry
title_full	Petrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib–Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry
title_fullStr	Petrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib–Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry
title_full_unstemmed	Petrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib–Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry
title_sort	petrogenesis of neoproterozoic ultramafic rocks, wadi ibib–wadi shani, south eastern desert, egypt: constraints from whole rock and mineral chemistry
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/567973c1bead493191285341426aea0e
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Petrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib–Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry

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