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Contrasting zircon morphology and UPb systematics in peralkaline and metaluminous post-orogenic granite complexes of the Arabian Shield, Kingdom of Saudi Arabia

Chemical Geology: Isotope Geoscience Section
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https://doi.org/10.1016/0168-9622(89)90032-8

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Abstract

Uzircon ages are reported for seven metaluminous-to-peralkaline post-orogenic granites from the Late Proterozoic Arabian Shield of Saudi Arabia. Zircons from the metaluminous rocks are prismatic, with length-to-width ratios of ∼ 2–4: 1 and small pyramidal terminations. In contrast, zircons from three of the four peralkaline complexes either lack well-developed prismatic faces (are pseudo-octahedral) or are anhedral. Some zircons from the peralkaline granites contain inherited radiogenic Pb and have very high common Pb contents (206Pb/204Pb < 150), making the UPb method poorly suited for determining the age of these rocks. Zircons in the metaluminous granites do not contain inheritance and yield well-defined concordia intercepts. The span of ages of the seven complexes (670-470 Ma) indicates that post-orogenic granitic magmatism was not a singular event in the Arabian Shield but rather occurred as multiple intrusive episodes from the Late Proterozoic to the Middle Ordovician.

Suggested Citation

Aleinikoff, J., Stoeser, D.B., 1989, Contrasting zircon morphology and UPb systematics in peralkaline and metaluminous post-orogenic granite complexes of the Arabian Shield, Kingdom of Saudi Arabia: Chemical Geology: Isotope Geoscience Section, v. 79, no. 3, p. 241-258, https://doi.org/10.1016/0168-9622(89)90032-8.

Publication type Article
Publication Subtype Journal Article
Title Contrasting zircon morphology and UPb systematics in peralkaline and metaluminous post-orogenic granite complexes of the Arabian Shield, Kingdom of Saudi Arabia
Series title Chemical Geology: Isotope Geoscience Section
DOI 10.1016/0168-9622(89)90032-8
Volume 79
Issue 3
Year Published 1989
Language English
Publisher Elsevier
Description 18 p.
First page 241
Last page 258
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