Multiphase Alkaline Basalts of Central Al-Haruj Al-Abyad of Libya : Petrological and Geochemical Aspects
Joint Authors
Abdel-Karim, Abdel-Aal M.
Ramadan, al-Nuri M.
Embashi, Mohamed R.
Source
Journal of Geological Research
Issue
Vol. 2013, Issue 2013 (31 Dec. 2013), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2013-06-18
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Earth Science , Water and Environment
Abstract EN
Al-Haruj basalts that represent the largest volcanic province in Libya consist of four lava flow phases of varying thicknesses, extensions, and dating.
Their eruption is generally controlled by the larger Afro-Arabian rift system.
The flow phases range from olivine rich and/or olivine dolerites to olivine and/or normal basalts that consist mainly of variable olivine, clinopyroxene, plagioclase, and glass.
Olivine, plagioclase, and clinopyroxene form abundant porphyritic crystals.
In olivine-rich basalt and olivine basalt, these minerals occur as glomerophyric or seriate clusters of an individual mineral or group of minerals.
Groundmass textures are variably intergranular, intersertal, vitrophyric, and flow.
The pyroclastic, clastogenic flows and/or ejecta of the volcanic cones show porphyritic, vitrophric, pilotaxitic, and vesicular textures.
They are classified into tholeiite, alkaline, and olivine basalts.
Three main groups are recorded.
Basalts of phase 1 are generated from tholeiitic to alkaline magma, while those of phases 3 and 4 are derived from alkaline magma.
It is proposed that the tholeiitic basalts represent prerift stage magma generated by higher degree of partial melting (2.0–3.5%) of garnet-peridotite asthenospheric mantle source, at shallow depth, whereas the dominant alkaline basalts may represent the rift stage magma formed by low degree of partial melting (0.7–1.5%) and high fractionation of the same source, at greater depth in an intra-continental plate with OIB affinity.
The melt generation could be also attributed to lithosphere extension associated with passive rise of variable enriched mantle.
American Psychological Association (APA)
Abdel-Karim, Abdel-Aal M.& Ramadan, al-Nuri M.& Embashi, Mohamed R.. 2013. Multiphase Alkaline Basalts of Central Al-Haruj Al-Abyad of Libya : Petrological and Geochemical Aspects. Journal of Geological Research،Vol. 2013, no. 2013, pp.1-12.
https://search.emarefa.net/detail/BIM-499472
Modern Language Association (MLA)
Abdel-Karim, Abdel-Aal M.…[et al.]. Multiphase Alkaline Basalts of Central Al-Haruj Al-Abyad of Libya : Petrological and Geochemical Aspects. Journal of Geological Research No. 2013 (2013), pp.1-12.
https://search.emarefa.net/detail/BIM-499472
American Medical Association (AMA)
Abdel-Karim, Abdel-Aal M.& Ramadan, al-Nuri M.& Embashi, Mohamed R.. Multiphase Alkaline Basalts of Central Al-Haruj Al-Abyad of Libya : Petrological and Geochemical Aspects. Journal of Geological Research. 2013. Vol. 2013, no. 2013, pp.1-12.
https://search.emarefa.net/detail/BIM-499472
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-499472