Positron Annihilation Spectroscopy of Basaltic Rocks from Plio-Qaternary Volcanics, Sana’a-Amran Volcanic Field, Yemen

¹Physics Department, Faculty of Science, Kafrelsheikh University, Kafr El-Sheikh 33511, Egypt

²Geology Department, Faculty of Science, Tanta University, Tanta 31527, Egypt

Adv. Mater. Lett., 2021, 12 (4), 21041624

DOI: 10.5185/amlett.2021.041624

Publication Date (Web): Feb 01, 2021

Copyright © IAAM-VBRI Press

E-mail: kamalreyad@sci.kfs.edu.eg

Abstract

We focus a new application of positron annihilation lifetime spectroscopy and Doppler broadening techniques at the annihilation sites have been applied on some basaltic rocks from inactive volcano related to Sana’a-Amrana volcanic Field (SAVF). A brief geologic set up and the main petrographic signature of this inactive volcano are given. To gain an insight into geological environment, open nanospaces in the well-characterized basaltic rocks were investigated by positron annihilation spectroscopy. The analysis of the lifetime spectra yielded two lifetime components. The olivine basalt samples contain less mono- vacancies than those found in the trachybasalt and vesicular basalt samples. The overall defect (vacancy) concentration and its variation in the samples were estimated using the mean positron lifetime (τ_m). The Doppler broadening parameters (S and W-Parameters) were measured. A little variation of the S-parameter values has been observed for all the studied samples indicating that the valance electron contribution to annihilation is not significant.  

Keywords

Positron annihilation spectroscopy, doppler broadening, free volume, plio-qaternary basaltic rock, Yemen.