Upper mantle anisotropy of southeast Arabia passive margin [Gulf of Aden northern conjugate margin], Oman

Ali Al-Lazki*, Cindy Ebinger, J M Kendall, George Helffrich, Sylvie Leroy, Christel Tiberi, Graham Stuart, Khalfan Al-Toobi

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

3 Citations (Scopus)

Abstract

In this study, we used data recorded by two consecutive passive broadband deployments on the Gulf of Aden northern margin, Dhofar region, Sultanate of Oman. The objective of these deployments is to map the young eastern Gulf of Aden passive continental margin crust and upper mantle structure and rheology. In this study, we use shear-wave splitting analysis to map lateral variations of upper mantle anisotropy beneath the study area. In this study, we found splitting magnitudes to vary between 0.33 and 1.0 s delay times, averaging about 0.6 s for a total of 17 stations from both deployment periods. Results show distinct abrupt lateral anisotropy variation along the study area. Three anisotropy zones are identified: a western zone dominated by NW-SE anisotropy orientations, an eastern zone dominated with NE-SW anisotropy orientations, and central zone with mixed anisotropy orientations similar to the east and west zones. We interpret these shorter wavelength anisotropy zones to possibly represent fossil lithospheric mantle anisotropy. We postulate that the central anisotropy zone may be representing a Proterozoic suture zone that separates two terranes to the east and west of it. The anisotropy zones west and east were being used indicative of different terranes with different upper mantle anisotropy signatures.

Original languageEnglish
Pages (from-to)925-934
Number of pages10
JournalArabian Journal of Geosciences
Volume5
Issue number5
DOIs
Publication statusPublished - Sep 2012

Keywords

  • Gulf of Aden
  • Arabia
  • SKS
  • Shear-wave splitting
  • Anisotropy
  • Passive continental margin
  • SEISMIC ANISOTROPY
  • PLATE-MOTION

Cite this