Middle holocene paleoenvironmental and geochemical study of lake Taka in Central Peloponnese, Greece

• Κύριος συγγραφέας: Χριστοδουλόπουλος, Διονύσης
• Άλλοι συγγραφείς: Christodoulopoulos, Dionisis
• Γλώσσα: English
• Έκδοση: 2021
• Θέματα: Sedimentological analyses; Handheld XRF analyzer; Paleoenvironmental evolution; Paleoclimatic archives; Shallow lacustrine environments; Geochemical elementary ratios; Mineralogical analyses; Magnetic susceptibility; Peloponnese; Statistical analyses; Ιζηματολογικές αναλύσεις; Στοιχειακός αναλυτής XRF χειρός; Παλαιοπεριβαλλοντική εξέλιξη; Παλαιοκλιματικά αρχεία; Ρηχά λιμναία περιβάλλοντα; Στοιχειακοί γεωχημικοί λόγοι; Ορυκτολογικές αναλύσεις; Μαγνητική επιδεκτικότητα; Πελοπόννησος; Στατιστικές αναλύσεις

Shallow lacustrine environments in Central-Northeastern Peloponnese, Greece have been experienced many paleoenvironmental changes during the Middle Holocene period. Lake Taka, the case study of this master thesis, is located near the city of Tripoli, northeastern of Asea Valley. The aim of this study is: (i) the Middle Holocene paleoenvironmental reconstruction of the lake and the determination of depositional processes and (ii) the interpretation of this region with other similar records, in order to define specific patterns which led to such paleoenvironmental and climatic shifts. A 6m core was extracted and analyzed, using different proxies. Sedimentological analysis such as, grain size analysis, total organic carbon (TOC), total nitrogen (TN), RGB Color measurement and Magnetic Susceptibility determination were carried out. Handheld XRF geochemical analysis and mineralogical analysis (X-ray diffraction) were also performed. Statistical analysis arise, correlation among geochemical elements and Principal Component Analysis (PCA) were conducted and the constructed age depth model was based on two of the six 14C datings. Interpretation and data synthesis revealed alternations in climatic and paleoenvironmental conditions during the last 5100 years, from dry and/or warm to wet and/or cold periods and a linkage between the other examined records. Taka Lake has been experienced these shifts in a more seasonal level, therefore it comprises a shallow environment of periodical droughts and floodings during summer-winter periods.