Sedimentary environments and climate change [Elektronische Ressource] : a case study (late Miocene, central Crete) / Karsten Friedrich Kröger

Sedimentary environments and climate change: a case study (late Miocene, central Crete) Dissertation Zur Erlangung des Grades Doktor der Naturwissenschaften Am Fachbereich Geowissenschaften Der Johannes Gutenberg-Universität Mainz Karsten Friedrich Kröger geb. am 29.12.1972 in Hamburg Mainz 2004 Abstract In this study, conditions of deposition and stratigraphical architecture of Neogene (Tortonian, 11-6,7Ma) sediments of southern central Crete were analysed. In order to improve resolution of paleoclimatic data, new methods were applied to quantify environmental parameters and to increase the chronostratigraphic resolution in shallow water sediments. A relationship between paleoenvironmental change observed on Crete and global processes was established and a depositional model was developed. Based on a detailed analysis of the distribution of non geniculate coralline red algae, index values for water temperature and water depth were established and tested with the distribution patterns of benthic foraminifera and symbiont-bearing corals. Calcite shelled bivalves were sampled from the Algarve coast (southern Portugal) and central 87 86Crete and then Sr/ Sr was measured. A high resolution chronostratigraphy was developed based on the correlation between fluctuations in Sr ratios in the measured sections and in a late Miocene global seawater Sr isotope reference curve.