Contribution to petrology and K/Ar amphibole data for plutonic rocks of the haggier Mts., Socotra island, Yemen

Ferry Fediuk, Kadosa Balogh

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A morphologically distinct intrusive massif emerges from sedimentary Mesozoic/Tertiary cover in Eastern Socotra forming the high Haggier Mts. It is mostly composed of peralkaline and hypersolvus granite partly accompanied by gabbroic rocks. Amphibole, the sole mafic mineral of the granite, shows predominately the arfvedsonite composition, while riebeckite, for which Socotra is reported in most manuals of mineralogy as the "locus typicus", occurs subordinatey only. Either Paleozoic or Tertiary age has been assumed for this massif for a long time. In the last decade, however, K/Ar datings have been published clearly showing Precambrian (Neoproterozoic) age. The present authors confirm with somewhat modified results this statement by five new radiometric measurements of monomineral amphibole fractions yielding values of 687 to 741 Ma for granites and 762 Ma for gabbroic rocks. The massif represents an isolated segment of numerous late postorogenic PanAfrican A-granite bodies piercing the Nubian-Arabian Shield and is explained as the result of partial melting of Pan-African calc-alkaline shield rocks in the closing stage of the orogeny.

Original languageEnglish
Pages (from-to)441-451
Number of pages11
JournalActa Geodynamica et Geomaterialia
Volume6
Issue number4
Publication statusPublished - Dec 1 2009

Keywords

  • Amphiboles
  • Arabian-Nubian shield
  • Coronitic gabbronorite
  • K/Ar data
  • Neoproterozoic
  • Peralkaline granite
  • Socotra
  • Yemen

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geophysics
  • Geology

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