Upper Neoproterozoic transitional magmatism of Bou-Gafer (Saghro, Anti-Atlas, Morocco): geochemical features and zircon typology
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- 作者：Mohamed El Baghdadi ; Ahmed Barakat ; Samir Nadem…
- 关键词：High ; K calc ; alkaline ; Bou ; Gafer ; Transitionnel ; Neoproterozoic ; Saghro ; Anti ; Atlas ; Zircon typology
- 刊名：Arabian Journal of Geosciences
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：9
- 期：2
- 全文大小：7,917 KB
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Wolf MB, Wyllie (1995) Liquid segregation parameters from amphibolite dehydration melting experiments. Jour Geophys Res 100-B8:15, 611–615, 621 - 作者单位：Mohamed El Baghdadi (1)
Ahmed Barakat (1)
Samir Nadem (1)
Abdelmajid El Boukhari (2)
1. Department of Earth Sciences, Faculté des Sciences et Techniques, P.O. Box 523, Beni Mellal, 23030, Morocco
2. Department of Earth Sciences, Faculté des Sciences Semlalia, Marrakech, Morocco - 刊物类别：Earth and Environmental Science
- 出版者：Springer Berlin Heidelberg
- ISSN：1866-7538
文摘
The Upper Neoproterozoic magmatism in Bou-Gafer hill, situated at the northeastern part of Saghro inlier, appears to be post-collisional with transitional character between high-K calc-alkaline and alkaline composition. The body belongs to the final stage of Anti-Atlas Pan-African orogeny. The Bou-Gafer body is composed of quartz monzonite as the main facies and pink granite forming the North and the South segments of the intrusion. Quartz monzonite is abundantly composed of abundant K-feldspar, zoned and twined plagioclase, quartz, green hornblende, clinopyroxene and biotite while pink granite shows abundance of alkali feldspar, quartz, plagiocalase and biotite with minor content of accessory minerals. The rocks of the body form a continuous series ranging from 57 to 76 % SiO2. Chemically, Bou-Gafer rocks are peraluminous, ferriferous and highly potassic, with agpaicity index down to 0.87. The large ion lithophile element (LILE) and high field strength element (HFSE) content of Bou-Gafer granitoids show high values in Rb, Ba, Zr, Y, Nb and Ga and slightly low contents of Sr. The spider diagrams of quartz monzonite and pink granite show enrichment in LILE characterising transitional magmatism and Nb-negative anomaly indicating the vestiges of subduction zone. Bou-Gafer rocks show similar rare earth element (REE) fractionation suggesting that fractional crystallisation can account for the continuous evolution from quartz monzonite to pink granite. The zircon typological distribution in quartz monzonite shows predominance of type S compared with types P and J with slightly represented [301] pyramid while zircon in pink granite is more represented by types S and P. A and T are higher suggesting high alkalinity (alkaline character) and high crystallisation temperature. The Bou-Gafer temperatures obtained and trace element composition (type A2: Y/Nb ratio higher than 1.2) seem to agree with liquid production in the lower crust or by interaction between magma resulting from the lithospheric-enriched mantle and magma produced in the lower continental crust. The magmatism of Bou-Gafer represents a transitional magmatic activity in Saghro hill, and part of the various post-collisional episodes that marked the final amalgamation of the Gondwana supercontinent.