Petrology of a Neoproterozoic mantle peridotite–chromitite association from Abu Dahr area, Eastern Desert, Egypt: Infiltration of a boninitic melt in highly depleted harzburgite

Halim, Ali H. Abdel; Helmy, Hassan M.; Elhaddad, Mervet A.; El–Mahallawi, Mahmoud M.; Mogessie, Aberra

doi:10.1016/j.jafrearsci.2020.103816

Cited by 5 publications

(5 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The data from the IBM forearc rock assemblages, Fuchuan ophiolite (FC, this study), Shimian ophiolite (SH), Bir Umq ophiolite (BU), Fawakhir ophiolite (FAW), Wizer ophiolite (WIZ), Abu Dahr ophiolite (Abu), Dunzhugur ophiolite (Dun), and Dariv‐Khantaishir ophiolite (DaK) are compiled from Abdel Halim et al. (2020), Abdel‐Karim et al. (2018), Abuamarah (2020), Dandar et al.…”

Section: Discussionmentioning

confidence: 99%

The Fuchuan Ophiolite in South China: Evidence for Modern‐Style Plate Tectonics During Rodinia Breakup

Huang

Wang

Kerr

et al. 2021

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Earth is the only known planet with plate tectonics, which facilitates interaction between the lithosphere, hydrosphere, and atmosphere and has promoted the development of the biosphere. In the past few decades, however, proposed ages for the start of subduction span almost all of geological time before the Cambrian (Palin et al., 2020; and references therein). In recent years, plate tectonics sensu lato has been subdivided into modern-style and ancient-style (Zheng & Zhao, 2020). Modern-style plate tectonics is a response to cold and deep subduction (Stern, 2005;Zheng & Zhao, 2020), whereas the ancient-style is characterized by warm and shallow subduction related to bimodal geodynamic regimes (Palin et al., 2020;Zheng & Zhao, 2020). Modern-style plate tectonics is linked with secular cooling of the mantle, accompanied by changes in the buoyancy and rheology of ocean lithosphere, resulting in the horizontal motion of lithosphere and thus tectonic evolution similar to subduction (Cawood et al., 2018;Holder et al., 2019).Ophiolites, representing fragments of oceanic crust and lithospheric mantle, have been tectonically incorporated into continental margins and can provide essential insights into the evolution of seafloor spreading, slab subduction, and plate tectonics (Dilek & Furnes, 2011Khan et al., 2020). Well-preserved ophiolites are widespread throughout the Phanerozoic, but this is in contrast to the Precambrian where ophiolites

show abstract

Section: Discussionmentioning

confidence: 99%

The Fuchuan Ophiolite in South China: Evidence for Modern‐Style Plate Tectonics During Rodinia Breakup

Huang

Wang

Kerr

et al. 2021

Geochem Geophys Geosyst

View full text Add to dashboard Cite

show abstract

“…1) is located in the South Eastern Desert of Egypt, ~70 km NW of Shalatin city on the Red Sea, and covers the largest part of Beitan province. It forms a part of the Arabo-Nubian Shield (890-570 Ma, Stern et al, 2004) and comprises Neoproterozoic Beitan gneisses, dismembered ophiolite, island arc metavolcanicplutonic assemblage, volcaniclastic metasediments (mélange matrix), and syn-to late-tectonic granite intrusions (Ashmawy, 1987;Abdel-Khalek et al, 1992;El Tahlawi et al, 1997;Zoheir et al, 2008;Arai, 2013, 2016;Gahlan et al, 2015;Abdel-Halim et al, 2020;Khedr et al, 2022). According to field relationships, the following sequence was established by El Tahlawi et al (1997) starting with the uppermost rock unit: 1) Abu Dahr Nappe, 2) Arayis ophiolitic mélange, 3) Egat metavolcaniclastics, and 4) Beitan gneisses.…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

“…According to field relationships, the following sequence was established by El Tahlawi et al (1997) starting with the uppermost rock unit: 1) Abu Dahr Nappe, 2) Arayis ophiolitic mélange, 3) Egat metavolcaniclastics, and 4) Beitan gneisses. The Abu Dahr ophiolite consists, from the base upward, of a mantle section (Abu Dahr Peridotite Nappe), ultramaficmafic cumulates, and crustal metagabbros and metabasalts (Gahlan et al, 2015;Abdel-Halim et al, 2020;Khedr et al, 2022). The crustal rocks are associated with the Arais and Balamhindit ophiolite complexes Arai, 2013, 2016).…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

“…Abdel-Halim et al, 2020). Massive chromitites form large pods within dunite 'envelopes' in harzburgites host.…”

mentioning

confidence: 99%

“…The nappe, structurally, forms the uppermost lithotectonic unit, thrusted southwestwards onto Beitan gneisses. It is divided into two major domains separated by EW-trending Abu Khayl fracture zone: Abu Dahr North and South(Abdel-Halim et al, 2020). The Abu Dahr North consists of harzburgite with minor dunite (+ chromitite), cut by a network of olivine-orthopyroxenite dykes.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Hydrothermal alteration of Ni-rich sulfides in peridotites of Abu Dahr, Eastern Desert, Egypt: Relationships among minerals in the Fe-Ni-Co-O-S system,fO2 andfS2

Abdel-Halim

2023

American Mineralogist

View full text Add to dashboard Cite

The Neoproterozoic peridotites of Abu Dahr, Eastern Desert of Egypt, consist mainly of highly depleted harzburgites that have experienced multiple stages of serpentinization (lizarditization and antigoritization) and carbonation/listvenitization in a forearc environment.The Abu Dahr forearc harzburgites are more oxidized than oceanic mantle, with the oxygen fugacity (fO 2 ) values ranging from FMQ +0.41 to FMQ +1.20 (average = +0.60 FMQ), and were equilibrated at temperatures of 910-1217°C and pressures of 4.1-7.8 kbar. This study has documented for the first time the presence of a variety of Ni-rich Ni-Fe (-Co) sulfide and metal phases along with Fe-oxides/oxyhydroxides in serpentinized-carbonated peridotites of the Abu Dahr forearc. Here I concentrate on the relationship between redox state and Fe-Ni-Co-O-S minerals with emphasis on the role of hydrothermal processes in upgrading magmatic sulfide tenors, desulfurization (sulfur-loss) of magmatic pentlandite and hydrothermal upgrading of the sulfide phases in Abu Dahr forearc environment. The minerals involved are high-Ni pentlandite (Fe 4 Ni 5 S 8 ), cobaltian pentlandite (Fe 3.47 Ni 4.78 Co 0.75 S 8 ), heazlewoodite (Fe 0.07 Ni 2.93 S 2 ), godlevskite (Fe 0.26 Ni 8.73 Co 0.01 S 8 ), millerite (Fe 0.01 Ni 0.98 Cu 0.01 S), awaruite (Ni 75 Fe 21 ) and native Ni (Ni 93 Fe 5 ), and nickeliferous magnetite and goethite. Chalcopyrite is a rare mineral; other Cuphases, Fe-sulfides and Ni-arsenides/phosphides are not present. Texturally, Ni-sulfide and alloy

show abstract

Petrogenesis of arc-related serpentinized peridotites (Egypt): Insights into Neoproterozoic mantle evolution beneath the Arabian-Nubian Shield

Khedr

Takazawa

Hauzenberger

et al. 2022

Journal of Asian Earth Sciences

View full text Add to dashboard Cite

Petrology of a Neoproterozoic mantle peridotite–chromitite association from Abu Dahr area, Eastern Desert, Egypt: Infiltration of a boninitic melt in highly depleted harzburgite

Cited by 5 publications

References 84 publications

The Fuchuan Ophiolite in South China: Evidence for Modern‐Style Plate Tectonics During Rodinia Breakup

The Fuchuan Ophiolite in South China: Evidence for Modern‐Style Plate Tectonics During Rodinia Breakup

Hydrothermal alteration of Ni-rich sulfides in peridotites of Abu Dahr, Eastern Desert, Egypt: Relationships among minerals in the Fe-Ni-Co-O-S system,fO2 andfS2

Petrogenesis of arc-related serpentinized peridotites (Egypt): Insights into Neoproterozoic mantle evolution beneath the Arabian-Nubian Shield

Contact Info

Product

Resources

About