ΠΜΣ με ειδίκευση στη Στρωματογραφία - Παλαιοντολογία
Library of the School of Science

2012-03-29

2012

Τζωρτζάκη Ευσεβία

Βασίλειος Καρακίτσιος, Καθηγητής, (επιβλέπων), Γεώργιος Αναστασάκης, Καθηγητής, Μαρία Τριανταφύλλου, Αναπληρώτρια Καθηγήτρια

Ανάλυση οριζόντων μαύρων αργίλων του Μεσοζωικού της Δυτικής Ελλάδας ως προς το περιεχόμενο τους σε μοριακά απολιθώματα

Greek

The purpose of this study was the identification of molecular fossils in Mid
Cretaceous sediments of the Ionian Zone. For this purpose, were taken sediment
samples, from beds rich in organic matter from a section in the Gotzikas area
(Epirus, Greece), which after proper preparation, (powdering, extraction with
organic solvent, desulphurisation of each sample extract with activated copper
and separation with column chromatography in aliphatic, aromatic and polar
fractions) were analyzed with gas chromatography coupled with mass
spectrometry, (GC-MS).
In the aliphatic and aromatic fractions of the samples were identified numerous
indigenous compounds of biological origin, (molecular
fossils) using appropriate software for the comparison of mass spectral
data derived from this analysis with relevant data of a fairly large database
obtained under similar analytical conditions. Also were compared the elution
times of compounds with the retention times reported in the literature.
Then an attempt was made of connecting different groups of molecular fossils
identified in the samples with organisms lived in the palaeoenvironment of
deposition, particularly for the beds that represent Oceanic Anoxic Events 1b
and 2 of the Mid Cretaceous. So were produced rough estimations of the extent
of the water column anoxic conditions that prevailed during those Oceanic
Anoxic Events of Early Albian and Cenomanian-Turonian.
Also was assessed the relative contribution of different groups of
prokaryotic and eukaryotic, marine and terrestrial organisms
in the sedimentary biogenic material in conjunction with the results of
previous geochemical and isotopic studies.
In the aliphatic and aromatic fractions of the extracts of the samples were
found numerous compounds of suspected biogenic origin that
was not possible to identify with the available literature data.
This identification would require the application of a combination of
analytical methods that should be the subject of more detailed future research.
This is also the situation for the analysis of the polar fractions of the
samples which comprise highly informative compounds.

Μolecular fossils , Βlack shales, Ionian Zone, Mid Cretaceous, Gas chromatography-Mass spectrometry

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https://pergamos.lib.uoa.gr/uoa/dl/object/1315777