Eburneen pegmatites of the Zenaga inlier (Anti-Atlas, Morocco): Petrography, geochemistry, and classification

The Precambrian Zenaga inlier, which is located in the central Moroccan Anti-Atlas, contains a series of dikes and pegmatitic lenses that are mostly hosted in mica schist and the Taznakht granite. They have provided large quantities of beryl and muscovite and were distinguished by the presence of co...

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Bibliographic Details
Published inJournal of African earth sciences (1994) Vol. 186; p. 104438
Main Authors Morsli, Yousra, Zerhouni, Youssef, Wafik, Amina, Elouazzani, Ali, Alikouss, Saida, Saidi, Abdellatif, Baroudi, Zouhir
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.02.2022
Subjects
Category LCT
Pegmatite
Precambrian
Taznakht granite
Zenaga
Category LCT
Pegmatite
Precambrian
Zenaga
Taznakht granite
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Summary:The Precambrian Zenaga inlier, which is located in the central Moroccan Anti-Atlas, contains a series of dikes and pegmatitic lenses that are mostly hosted in mica schist and the Taznakht granite. They have provided large quantities of beryl and muscovite and were distinguished by the presence of columbite-tantalite and several phosphate species. The investigated pegmatites are characterized by an abundance of quartz, muscovite, feldspars, tourmaline, and beryl and by the presence of accessory minerals such as apatite, zircon, sphene, and garnet. Their global geochemical characteristics show that they are derived from a fertile, peraluminous granite, which is an S-type granite with a calc-alkaline affinity. A petrogenetic relationships between the Taznakht granite and the pegmatites of Zenaga has been supported through (K/Rb) vs. Cs and (K/Cs) vs. Ta diagrams. These pegmatites are the result of moderate degrees of fractionation, with a slight enrichment in rare elements. The results obtained also allowed us to classify these pegmatites as lithium-cesium-tantalum-rich rare element pegmatites (REL-LCTs). •The Zenaga pegmatites are classified as LCT rich rare elements pegmatites•They are derived from a peraluminous S-type granite, with a calc-alkaline affinites•The Zenaga pegmatites are the result of a moderate degrees of fractionation•The chemical data support the petrogenetic link of pegmatites to Taznakht granite
ISSN:1464-343X
1879-1956
DOI:10.1016/j.jafrearsci.2021.104438