U-Pb zircon geochronology and Nd-Hf-O isotopic systematics of the Neoproterozoic Hadb adh Dayheen ring complex, Central Arabian Shield, Saudi Arabia

Kamal A. Ali, Heejin Jeon, Arild Andresen, Shuang Qing Li, Hesham M. Harbi, Ernst Hegner

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

A combined study of single zircon U-Pb dating, Hf-O zircon isotopic analyses and whole-rock Nd isotopic compositions was carried out to infer the magma sources of Neoproterozoic post-collisional A-type granitoids in Saudi Arabia. U-Pb zircon dating of magmatic zircons of two samples from the Hadb adh Dayheen ring complex yielded ages of 625±11Ma for a hornblende-biotite granite sample, and 613±4Ma for a monzogranite sample. The granitic rocks show initial εNd values of +4.1 to +5.3 and εHf of +4.5 to +8.4 that are lower than those of a model depleted mantle (εHf ~+14 and εNd ~+6.5) and consistent with melting of subduction-related crustal protoliths that were formed during the Neoproterozoic assembly of the Arabian-Nubian Shield (ANS). Crustal-model ages (Hf-tNC) of 0.81 to 1.1Ga are inconsistent with depleted-mantle Nd model ages of 0.71 to 0.81Ga and indicate that the post-collisional Hadb adh Dayheen granites were derived mostly from juvenile crust formed in Neoproterozoic time. Single zircons data show a wide range in δ18O values from +3.2‰ to +6.4‰, possibly indicating crystallization of zircon from magma derived from magmatic rocks altered by meteoric water in a magma chamber-caldera system.

Original languageEnglish
Pages (from-to)348-360
Number of pages13
JournalLithos
Volume206-207
Issue number1
DOIs
Publication statusPublished - Oct 2014
Externally publishedYes

Keywords

  • A-type granites
  • Arabian-Nubian Shield
  • Single zircon Hf-O isotopes
  • Sm-Nd isotopes
  • U-Pb zircon dating

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

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