Betreuer: PD Dr. G. Hoffmann & Prof. Dr. Miklós Kázmér
Titel der Masterarbeit:
Bioerosional and bioconstructional textures in the lagoon of Sur (Oman) and their relevance for sea level research.
Being able to reconstruct the paleo sea level is a valuable tool to make assumptions about the future sea level. This can be done with so called sea level indicators such as coastal notches, beachrocks, marine terraces, archeological remains of human settlements or biological indicators. The latter are called FBI´s (Fixed Biological Indicators) and can generally be divided into bioerosional and bioconstructional organisms. They include e.g. bivalves (Lithophaga, oysters), gastropods, barnacles and serpulid worms, which have been successfully used as sea level indicators in various locations around the world (Japan, Australia, Jamaica, Thailand, Colombia, Turkey, Greece, Syria and Malaysia). However, the distribution of biological indicators and their potential use for the reconstruction of the paleo-sea level have not been investigated in the Sultanate of Oman before. In this thesis, the location of coastal notches from the Eemian period as well as recent coastal notches with biological indicators around the lagoon of Sur, Oman, are noted. Furthermore, the vertical distribution of the comprising bioerosional and bioconstructional organisms is described. The research shows that from the investigated FBI´s oysters, Lithophaga and sponges can be used to identify certain tidal zones in the study area. Moreover, the presence of impossible distributions, such as oysters in the supratidal zone, where they cannot survive, or the appearance of certain organisms located on top of each other reveal regression/transgression phases in a decimeter to meter range since the Eemian period. As the area around Sur lagoon is tectonically stable, the sea level changes are attributed to eustatic and not isostatic changes. As this was the first research of its kind in the Sultanate of Oman, continuing work and more data is necessary to provide further evidence for the conclusions described herein.