Mineralogical and geochemical study of rodingites and associated serpentinized peridotite, Eastern Desert of Egypt, Arabian-Nubian Shield

Abstract

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Formation of gold-bearing listvenite in the mantle section of the Neoproterozoic Bir Umq ophiolite, Western Arabian Shield, Saudi Arabia

“…Rather the budget of REEs and their patterns are likely controlled by transfer from and exchange with serpentinizing fluids (Paulick et al, 2006;Deschamps et al, 2013). The patterns are similar to a number of serpentinite localities in the Eastern Desert of Egypt (Mubarak et al, 2020) and in Saudi Arabia (Gahlan et al, 2021). The modestly higher REE budget in serpentinized dunite samples may reflect differences in REE compatibility in serpentine with different Si/(Mg+Fe) ratio or it may reflect REE uptake in minor secondary mineral phases such as tremolite and anthophyllite.…”

Geochemical Occurrence of Rare Earth Elements in Mining Waste and Mine Water: A Review

“…Both regions are characterised by remarkable positive Eu anomalies (Eu*/Eu UCCN = 0.24-0.26 and 0.24-0.33 for the Illinois and Powder coal basins, respectively). The presence of plagioclase crystals usually justifies the positive Eu anomalies [24][25][26]. This is further confirmed by the fact that the rocks of the Powder basin are usually plagioclase-rich.…”

Multiple Rodingitization Stages in Alkaline, Tholeiitic, and Calc-Alkaline Basaltic Dikes Intruding Exhumed Serpentinized Tethyan Mantle from Evia Island, Greece

“…Andradite and chlorite were formed at the expense of grossular, as shown in Equation ( 5) (see [55]). Crystallization of andradite was favored by relatively low temperatures ranging between 300 and 350 °C, accompanied by low CO 2 , acidic, and Ferich conditions [4,55].…”

“…Rodingites are calc-silicate rocks that most often form after metasomatic replacement of mafic (gabbroic or basaltic) protoliths but can be also developed at the expense of ultramafic or even felsic rocks [1][2][3]. They typically contain garnet, diopside, and chlorite [4], although in many cases, additional secondary mineral phases may participate in variable amounts. These include epidote, zoisite, pumpellyite, prehnite, vesuvianite, tremolite, actinolite, talc, and opaque minerals [5,6].…”