Metamorphosis of Marine Organic Matter in the Jurassic Deposits from Sharab Area, Taiz Governorate of Southwestern Yemen: Thermal Effect of Tertiary Volcanic Rocks

Authors

  • Mohammed Hail Hakimi
     Geology Department, Taiz University, 6803 Taiz
  • Mukhtar A. Nasher
     Geology Department, Taiz University, 6803 Taiz
  • Shadi A. Saeed
     Geology Department, Taiz University, 6803 Taiz
  • Hitham Al-Hakame
     Geology Department, Taiz University, 6803 Taiz
  • Tareq Al-Moliki
     Geology Department, Taiz University, 6803 Taiz
  • Kholah Qaid Al-Sharabi
     Geology Department, Taiz University, 6803 Taiz

DOI:

https://doi.org/10.1007/s12594-017-0607-x

Abstract

The Tertiary volcanic rocks are widely exposed in the Sharab area of Taiz Governorate, southwestern Yemen. The Jurassic calcareous shale and black limestone deposits collected closely to the Tertiary volcanic rocks were investigated to provide information regarding the thermal effects of Tertiary volcanic rocks on organic materials. The bulk geochemical results indicate that the analysed Jurassic deposits are organically lean with present-day TOC values less than 0.95% and very low HI values (<50 mg HC/g TOC), with a predominantly Type IV kerogen (inert carbon). This is attributed to thermal effect on the original organic matter as indicated by high thermal maturity data, consistent with postmature to metagenesis stage. The present study also suggests that the high thermal maturity of the Jurassic marine deposits is due to the presence of the alkali basalts which have invaded the Jurassic rocks during late Oligocene to early Miocene (~10 Ma). Thus, the heat flow caused by Tertiary basaltic rocks further increased the temperature level and led to metamorphosis of organic matter and converted it to graphitic materials (inert carbon).

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Issue

Volume 89, Issue 3, March 2017 Pages (229-356)

Section

Research Articles

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Published

2017-03-01

How to Cite

Hakimi, M. H., Nasher, M. A., Saeed, S. A., Al-Hakame, H., Al-Moliki, T., & Al-Sharabi, K. Q. (2017). Metamorphosis of Marine Organic Matter in the Jurassic Deposits from Sharab Area, Taiz Governorate of Southwestern Yemen: Thermal Effect of Tertiary Volcanic Rocks. Journal of Geological Society of India, 89(3), 325–330. https://doi.org/10.1007/s12594-017-0607-x
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