Multiple Stages of Carbonation and Element Redistribution during Formation of Ultramafic-Hosted Magnesite in Neoproterozoic Ophiolites of the Arabian-Nubian Shield, Egypt
Abstract
We present a study of the serpentinized peridotites of the Ghadir-Mohagar-Ambaut area, Egypt. They represent the mantle section of a dismembered ophiolite, tectonically emplaced over a volcanosedimentary succession of island arc assemblages. The serpentinites are variably metamorphosed from greenschist to lower-amphibolite facies, metasomatized, and altered, including development of talc-carbonate and quartz-carbonate rocks, especially along shear zones and fault planes. Nevertheless, some samples contain relics of primary chromian spinel, olivine, and pyroxenes. Relict textures and whole-rock compositions (Mg#[molar Mg/(Mg+Fe2+)]=0.92–0.93, with low Al2O3 and CaO contents) both suggest harzburgite protoliths. The high Mg# and Ni contents of relict olivine and the high Cr# (molar Cr/(Cr+Al)) of fresh chromian spinel cores indicate that the protoliths experienced high degrees of partial melt extraction (∼34%–39%), well beyond the limit for exhaustion of clinopyroxene from the residue and consistent with formation in a forearc suprasubduction zone environment. The serpentinized ultramafic rocks in the study area are divided into massive serpentinite, serpentinite-hosted magnesite masses, and magnesite-filled veins. The carbonation and formation of magnesite ores took place through two metasomatic stages; the first is represented by the magnesite masses and associated with deep-seated metasomatism and alteration during serpentinization, whereas the second, vein-forming stage postdates serpentinization and occurred during obduction of the ophiolite. The differences in chemical composition between massive serpentinite and serpentinite-hosted magnesite masses suggest leaching of some elements and enrichment of others during carbonation; MgO, Cr, and Ni are depleted, whereas Fe2O3, CaO, MnO, Nb, Ba, Cu, Pb, Sr, and Zn are enriched in the serpentinite-hosted magnesite masses, relative to the host massive serpentinite.
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Natural carbon uptake in ultramafic formations is significant as evidenced by abundantly exposed carbonate-bearing ophiolite complexes worldwide.
“Natural carbon uptake in ultramafic formations is significant as evidenced by abundantly exposed carbonate-bearing ophiolite complexes worldwide (Akbulut et al., 2006; Azer et al., 2019; Barnes & O'Neil, 1969; Barnes et al., 1978; Beinlich et al., 2010, 2012, 2018, 2020a; Belogub et al., 2017; Emam & Zoheir, 2013; Gahlan Hisham et al., 2018; García del Real et al., 2016; H”
From Ultramafic Rock Carbonation: Constraints From Listvenite Core BT1B, Oman Drilling Project (2020) · cites this paper as Azer et al., 2019
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“…in ultramafic formations is significant as evidenced by abundantly exposed carbonate‐bearing ophiolite complexes worldwide (Akbulut et al., 2006; Azer et al., 2019; Barnes & O'Neil, 1969; Barnes et al., 1978; Beinlich et al., 2010, 2012, 2018; Beinlich, John, et al., 2020; Belogub et al.,…”
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Self-citationPetrogenetic Evolution of the Neoproterozoic Igneous Rocks of Egypt
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Self-citationNeoproterozoic Ophiolites of the Arabian-Nubian Shield
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Self-citationGeological and tectonic significance of rodingite in the Ess ophiolite, Arabian Shield, Saudi Arabia
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- Authors
- Azer, M. K., Gahlan, H. A., Asimow, P. D., Mubarak, H. S., & Al-Kahtany, K. M.
- Affiliations
- National Research Centre (EG)
- King Saud University (SA)
- California Institute of Technology (US)
- Corresponding author
- Azer, Mokhles K.
- Gahlan, Hisham A.
- Asimow, Paul D.
- Mubarak, Heba S.
- Al-Kahtany, Khaled M.
- Venue
- The Journal of Geology
- Publisher
- University of Chicago Press
- Published
- 2019-01
- Volume
- 127
- Issue
- 1
- Pages
- 81-107
- ISSN
- 0022-1376 (ISSN-L)
- 1537-5269
- OpenAlex
- W2905178961
- Cited by
- 43
- References
- 109
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 8 · 2023: 5 · 2022: 4 · 2021: 7 · 2020: 9 · 2019: 5
- FWCI
- 3.77
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Journal of Geology (publishedVersion)
- CaltechAUTHORS (California Institute of Technology) (submittedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Keywords
- magnesite, serpentinization, peridotite, ultramafic rocks, ophiolite, metasomatism, carbonation, element redistribution, supra-subduction zone, obduction, Arabian-Nubian Shield, Neoproterozoic, chromian spinel
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