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• Stable isotopes, radionuclides, and heavy metals in calcareous organisms (corals, mollusks, foraminifers) and in marine sediments as tracers in environmental and climatic studies,
• Paleoclimatology and Paleoceanography (coral paleoclimatology), global and subtropical climate changes derived from marine proxy records.
• Applications of radioactive isotopes (¹⁴C, ²¹⁰Pb, ¹³⁷Cs) for investigating sedimentation rates and pollution history from marine environment,
• Coral reef geology, health, and growth.
• The geological and environmental aspects of the Gulf of Aqaba and the Red Sea.​