Tectonostratigraphy of Heraklia Island, based on geological mapping, structural analysis and LA-ICP-MS detrital zircon dating.

Postgraduate Thesis uoadl:2624561 616 Read counter

Unit:
Κατεύθυνση Τεκτονική
Library of the School of Science
Deposit date:
2018-01-19
Year:
2018
Author:
Laskari Sofia
Supervisors info:
Στυλιανός Λόζιος, Επίκουρος Καθηγητής (ΕΚΠΑ)
Daniel Fritz Stockli, Professor(Jackson School of Geosciences, UT Austin)
Κωνσταντίνος Σούκης Ε.ΔΙ.Π. (ΕΚΠΑ)
Original Title:
Tectonostratigraphy of Heraklia Island, based on geological mapping, structural analysis and LA-ICP-MS detrital zircon dating.
Languages:
English
Translated title:
Tectonostratigraphy of Heraklia Island, based on geological mapping, structural analysis and LA-ICP-MS detrital zircon dating.
Summary:
The small Heraklia Island, located at the center of the Attic-Cycladic core complex in the Aegean, is bridging the gap between the islands of Naxos and Ios, in which Variscan basement and Cycladic Blueschist Unit rocks crop out. In this paper we present preliminary results obtained with LA-ICP-MS U-Pb detrital zircon dating combined with detailed geological mapping and structural observations.
On Heraklia Island the Cycladic Blueschist Unit (CBU) comprises variegated marbles, white ultramylonitic marbles (central and northern part of the island) and quartz-mica schists interbedded with lenses of orthogneissic rocks (south and southwest). The CBU rocks of Heraklia bear similarities with the sequences in SE Naxos as they preserve relics of the Eocene HP event in the form of glaucophane inclusions within feldspar porphyroblasts of the retrograde greenschists facies assemblages. The greenschist facies minerals form a penetrative (mylonitic) foliation and a ~N-S stretching lineation, subparallel to isoclinal folding in all scales.
LA-ICP-MS U-Pb detrital zircon dating of schists and gneisses yielded diverse maximum deposition ages (MDA) that span from ~550Ma (Panafrican) in the lowermost quartz-mica schists, to Triassic in the orthogneisses (~230Ma) and finally to late Cretaceous in the quartz-mica schists (~80Ma). These ages point to a complicated tectonostratigraphy and highlight the areas that need further studying.
Main subject category:
Science
Keywords:
Southern Cyclades, Heraklia island, CBU, U-Pb detrital zircon, shear zone
Index:
Yes
Number of index pages:
1
Contains images:
Yes
Number of references:
155
Number of pages:
70
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