Unit:
Department of Geology and GeoenvirommentLibrary of the School of Science
Author:
Anastasatou Marianthi
Dissertation committee:
- Μιχαήλ Σταματάκης, Καθηγητής, Τμήμα Γεωλογίας & Γεωπεριβάλλοντος, Εθνικό και Καποδιστριακό Πανεπίστήμιο Αθηνών
- Αθανάσιος Γκοντελίτσας, Αναπληρωτής Καθηγητής, Τμήμα Γεωλογίας & Γεωπεριβάλλοντος, Εθνικό και Καποδιστριακό Πανεπίστήμιο Αθηνών
- Αριστομένης Καραγεώργης, Ερευνητής Α’, Ινστιτούτο Ωκεανογραφίας, Ελληνικό Κέντρο Θαλάσσιων Ερευνών
- Σεραφείμ Πούλος, Καθηγητής, Τμήμα Γεωλογίας & Γεωπεριβάλλοντος, Εθνικό και Καποδιστριακό Πανεπίστήμιο Αθηνών
- Ιωάννης Μήτσης, Επίκουρος Καθηγητής, Τμήμα Γεωλογίας & Γεωπεριβάλλοντος, Εθνικό και Καποδιστριακό Πανεπίστήμιο Αθηνών
- Βασίλειος Καψιμάλης, Ερευνητής Α’, Ινστιτούτο Ωκεανογραφίας, Ελληνικό Κέντρο Θαλάσσιων Ερευνών
- Θωμάς Χασιώτης, Αναπληρωτής Καθηγητής, Τμήμα Ωκεανογραφίας & Θαλασσίων Βιοεπιστημών, Πανεπιστήμιο Αιγαίου
Original Title:
Marine Aggregate Deposits in Greece: sedimentological - mineralogical and geochemical study ─ Usage possibilities
Translated title:
Marine Aggregate Deposits in Greece: sedimentological - mineralogical and geochemical study ─ Usage possibilities
Summary:
The present PhD Thesis entitled “Marine Aggregate deposits in Greece: sedimentological - mineralogical and geochemical study ─ Usage possibilities” concerns the systematic investigation of the potential of Marine Aggregate (MA) deposits in Greece with respect to their industrial use. This thesis focuses on the research of various offshore modern sediments in the Greek continental shelf concerning their sedimentological, mineralogical and geochemical characteristics emphasizing the research of silica (quartz) sand. These offshore study areas are prioritized as potential MA deposits according their qualitative characteristics (such as grain size, mineralogy and geochemistry) of the sediments and significant environmental characteristics of the offshore areas.
Specifically, four offshore areas in the Greek territory, such as SE Evia, NW Crete, south and east Lesvos and NE Rhodes Island, were investigated regarding their potential to host MA deposits suitable for the construction industry. A few coastal areas, in central/eastern Evia Island, western Crete Island, north and east Peloponese, Milos, Samos and Kefalonia Island, were examined in order to suggest or not their potential for further offshore investigation. Moreover, selected industrial samples were employed as materials for evaluation and comparison to the study sediments.The suitability degree as aggregates for concrete was defined, according the performance of the materials from the qualified areas on specific technical tests.
In order to achieve the above goals, surficial offshore and coastal sediments and offshore gravity cores were collected. For the deterimination of the qualitative characteristics of the sediments were defined: the granulometric parameters, the density, the mineralogy by stereoscopy, XRD and SEM/EDS, the geochemistry by XRF method, the calcium carbonates and the chlorides. The technical tests that were employed in order to define the suitability degree of the proposed materials as aggregates in concrete were sand equivalent and methylene blue test. In the proposed areas, the spatial environmental restrictions that were applied are: Posidonia oceanica Natura zones, closure depth and proper distance from the coastline.
The offshore area of Evia Island is suggested as the most promising area and hosts MA deposits that cover 2.03 km2 up to the water-depth of 50 m.The second most promising area is Kissamos Bay, NW Crete Island, which hosts MA deposit that covers 4.85 km2 up to the isobath of 50 m.
This is the first time that an integrated study based on qualitative criteria regarding MA deposits is carried out in Greece.The suggested MA deposits and the proposed coastal areas for further investigation, contribute to the national potential for raw materials. However, for the final stage of MA deposits delimitation and exploitation, apart from the quantitative characteristics (oceanographic study), the local spatial planning issues should be considered in order to support the environmental, social and economic sustainability pillars.
Main subject category:
Science
Keywords:
Marine aggregates, offshore deposits, marine placers, inert materials, sand, gravel, dredging, concrete aggregates, beach nourishment, Evia, Crete, Kissamos, Rhodes, Afantou, Lesvos, Eresos, Vatera
Number of references:
209
