Rocce metamorfiche del deserto centro-orientale, Egitto

Rocce metamorfiche del deserto centro-orientale, Egitto

Haroun A.Mohamed

77,94 €
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Editorial:
KS OmniScriptum Publishing
Año de edición:
2024
Materia
Ciencias de la tierra/geociencias
ISBN:
9786208114077
77,94 €
IVA incluido
Disponible

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Il deserto centrale orientale dell’Egitto presenta una vasta gamma di rocce metamorfiche, che fanno parte della cintura orogenica panafricana. Queste rocce, principalmente facies scistose di colore verde medio-basso, comprendono sequenze metamorfiche vulcano-sedimentarie che presentano metasedimenti come fanghi, fanghi ciottolosi, greywackes e scisti, insieme a metavolcanici come metabasalti, meta-andesiti e porfiriti. Le analisi petrolchimiche suggeriscono un’origine mista, con caratteristiche di rocce calcaree e subalcaline, con prevalenza di rocce vulcaniche mature dell’arco insulare. Gli scisti presentano composizioni e tessiture diverse, tra cui clorite, epidoto, biotite, grafite, orneblenda, talco e scisti di tremolite-actinolite. Gli studi petrografici suggeriscono un’origine o un protolite comune tra gli scisti, i metasedimenti e i metavolcani, evidenziati dalla sovrapposizione delle composizioni chimiche. Questi risultati approfondiscono la nostra comprensione dell’evoluzione geologica della regione, offrendo spunti di riflessione sui processi tettonici e sugli ambienti deposizionali che hanno modellato il deserto centrale orientale dell’Egitto all’interno della più ampia cintura orogenica panafricana.

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