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Geochemistry, Geochronology and Mineralization Styles Accompanying the Neoproterozoic Evolution of...
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Geochemistry, Geochronology and Mineralization Styles Accompanying the Neoproterozoic Evolution of Orogenic Belts

A special issue of Minerals (ISSN 2075-163X).

Deadline for manuscript submissions: closed (15 April 2024) | Viewed by 2365

Special Issue Editors

Prof. Dr. Mohamed Zaki Khedr

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Guest Editor
Department of Geology, Faculty of Science, Kafrelsheikh University, Kafr El- Sheikh 33516, Egypt
Interests: petrology and geochemistry of ophiolitic/Alaskan-type rocks and their mineralizations (magnetite, chromitites, platinium group elements); geochemistry of iron and titanium-bearing mafic-ultramafic layered intrusions (ilmenite-magnetite ore deposits); mantle processes (melting process, mantle metasomatism/heterogenity, thermal anomaly of mantle, mantle geodynamic, mantle upwelling/recycle etc.); carbonization of mantle (Rodingites and Listvenite)
Special Issues, Collections and Topics in MDPI journals
Dr. Richard M. Palin

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Guest Editor
Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, UK
Interests: metamorphic processes; fluid–rock interaction; secular change; Archean; calculated phase equilibria
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Orogenic or mobile belts are mountainous regions of the Earth's crust that develop at ocean–continent or continent–continent convergent plate margins. Such belts have been documented since the onset of plate tectonics during the Archean and are host to a wide range of mineral resources. In this Special Issue, we focus on the geochemistry, geochronology, and mineralization in the Neoproterozoic orogenic belts that formed during the period 1000–450 Ma, including the East African orogen that formed the Arabian Nubian Shield and the Mozambique belt; the Brasílian belt; the Sergipano orogenic belt; the Zambezi orogenic belt; the Chinese Jiangnan orogen; and the Western Ethiopia Tuludimtu orogenic belt. These belts are extensively mineralized, for example, rare metal-bearing granites and pegmatites, gold-bearing metagabbros and metavolcanics, copper, cobalt and nickel in metavolcanics and related rocks, chromitite deposits and associated platinum group minerals.

This Special Issue aims to provide a platform for the publication of the latest research and ideas on Neoproterozoic orogenic belts. For any inquiries related to this Special Issue, please contact the Editorial Office. The Special Issue will address the following topics:

  1. Mineralogy, petrology, geochemistry and geochronology of Neoproterozoic orogenic belts and hosted mineral resources;
  2. Integration of remote sensing and geochemical data for the exploration of mineral deposits in the Neoproterozoic orogenic belts;
  3. Mineral resources accompanying the Neoproterozoic evolution of orogenic belts;
  4. Lithospheric structures and geodynamic evolution of the orogenic belts;
  5. Magmatic processes, fractionation and differentiation, and fluid–flow effects, compositions and evolutions in the crust and crust–mantle boundary;
  6. Stable isotope (O, C, H) and isotopic compositions (e.g., Ar‒K, Rb–Sr, Re‒Os, Sm‒Nd, Lu‒Hf, U‒Pb) of crustal rocks (whole rocks) and their minerals.

Prof. Dr. Mohamed Zaki Khedr
Dr. Richard M. Palin
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Minerals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • mineralogy, petrology, and geochemistry of igneous and sedimentary rocks and their mineral resource in Neoproterozoic orogenic/mobile belts
  • minerals
  • geotectonic and geodynamic evolution of Neoproterozoic orogenic belts
  • geochronology, radioactive and stable isotope studies

Published Papers (2 papers)

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Research

32 pages, 16798 KiB  
Article
The Geology and Mineral Chemistry of Beryl Mineralization, South Eastern Desert, Egypt: A Deeper Insight into Genesis and Distribution
by Mohamed Zaki Khedr, Gehad M. Saleh, Khaled M. Abdelfadil, Eiichi Takazawa, Kamal Abdelrahman, Akihiro Tamura and Shaimaa Ali El-Shafei
Minerals 2024, 14(5), 465; https://doi.org/10.3390/min14050465 - 28 Apr 2024
Viewed by 279
Abstract
Beryl mineralization in the Nugrus-Sikait domain in the South Eastern Desert (SED) of Egypt occurs as disseminated crystals in granitic pegmatite and quartz, as well as pegmatite veins crosscutting mélange schist and ophiolitic rocks. When granitic pegmatite comes into contact with the ophiolitic [...] Read more.
Beryl mineralization in the Nugrus-Sikait domain in the South Eastern Desert (SED) of Egypt occurs as disseminated crystals in granitic pegmatite and quartz, as well as pegmatite veins crosscutting mélange schist and ophiolitic rocks. When granitic pegmatite comes into contact with the ophiolitic rocks, phlogopite and amphibole schists are formed due to K metasomatism. The ophiolitic mélange is intruded by leucogranite and related pegmatite along the NNW to NW Nugrus shear zone. Beryl samples have been collected from Um Sleimat, Madinat Nugrus, Wadi Abu Rusheid, and Wadi Sikait. Major oxides and in situ trace and rare earth elements (REEs) of beryl and associated minerals were analyzed through EPMA and LA-ICP-MS, respectively. The investigated beryl, based on its color and chemical compositions, can be classified into the two following types: pegmatitic beryl (type I) and schist-related beryl (type II). The former is colorless to pale green, and is mainly restricted in pegmatite veins; it is poor in Cr2O3 (up to 0.03 wt%) and MgO (Nil). The latter, deep green in color, is rich in Cr2O3 (up to 0.27 wt%) and MgO (up to 2.71 wt%), and occurs within quartz veins, phlogopite schists, and tremolite schists. The abundant beryl mineralization in phlogopite schists and their related quartz veins suggests that granite and associated pegmatite are the source rocks for the Be-bearing fluids that migrate along the NW-SE trending deep-seated tectonic zone, such as the Nugrus shear zone. Therefore, the formation of beryl in schists is attributed to the interaction of granitic/pegmatitic-derived Be-bearing fluids with serpentinite and gabbro interlayered with mélange schists. Variations in the trace and REE contents of both beryl types (I and II) indicate their two-stage formation from different compositions of Be-rich fluids, where light REEs, Zr, Nb, Ba, and Th decrease from type I beryl to type II. These two phases of beryl could be attributed to the magmatic/hydrothermal fluids associated with the pegmatite emplacement. The early phase of the late-stage magmatic-derived fluids was closely related to magma evolution and pegmatite formation, forming euhedral type I beryl. The late phase of pegmatite-derived fluids was mixed with serpentinite/schist-derived fluids that cause high V and Cr content in type II beryl. The composition of parent magmas of felsic rocks, the high degree of magma fractionation or the late stage melts, fluid compositions (rich in Be, Li, Cs, Rb, K), and alkali metasomatism, as well as the linear NW-SE trending deep-seated shear zone, are all factors possibly influencing beryl mineralization in the SED of Egypt. Full article
(This article belongs to the Special Issue Geochemistry, Geochronology and Mineralization Styles Accompanying the Neoproterozoic Evolution of Orogenic Belts)
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31 pages, 7534 KiB  
Article
Geochemical Characteristics, Zircon U-Pb Ages and Lu-Hf Isotopes of Pan-African Pegmatites from the Larsemann Hills, Prydz Bay, East Antarctica and Their Tectonic Implications
by Shi Zong, Yingchun Cui, Liudong Ren, Hao Zhang, Shaocong Chen, Weixuan Wang and Shenggui Li
Minerals 2024, 14(1), 55; https://doi.org/10.3390/min14010055 - 31 Dec 2023
Viewed by 961
Abstract
Prydz Bay is an important part of the Pan-African high-grade tectonic mobile belt. The focus of this investigation, by applying zircon LA-ICP-MS U-Pb geochronology, zircon Lu-Hf isotope systematics, and whole-rock geochemistry, is on Pan-African pegmatites in the Larsemann Hills of Prydz Bay, East [...] Read more.
Prydz Bay is an important part of the Pan-African high-grade tectonic mobile belt. The focus of this investigation, by applying zircon LA-ICP-MS U-Pb geochronology, zircon Lu-Hf isotope systematics, and whole-rock geochemistry, is on Pan-African pegmatites in the Larsemann Hills of Prydz Bay, East Antarctica, their association with country rocks, and the formation conditions. Based on the obtained results, it is concluded that the pegmatites exhibit elevated levels of silica and alkali and possess peraluminous features. These pegmatites originated during the late Neoproterozoic–Early Cambrian (Pan-African) event, specifically in the D2–D4 stages. The D2 stage occurred between 546 and 562 Ma, followed by D3-stage pegmatites around 534 Ma. The pegmatites from the D2–D3 stages are considered to originate from Paleoproterozoic crustal materials, while there are at least two phases of pegmatites in the D4 stage (~517 Ma and ~521 Ma). The D4-1 pegmatite (~521 Ma) suggested both Paleo–Mesoproterozoic crustal origin, perhaps connected to extension. The D4-2 pegmatite (~517 Ma) originated from the crust layers. In the Larsemann Hills, Pan-African pegmatites formed in a recurring regime of tension. Therefore, the obtained data elucidate that a Pan-African stretching process might have occurred in Prydz Bay. Full article
(This article belongs to the Special Issue Geochemistry, Geochronology and Mineralization Styles Accompanying the Neoproterozoic Evolution of Orogenic Belts)
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