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11 results on '"Gerogiannis, N."'

5. Ductile nappe stacking and refolding in the Cycladic Blueschist Unit: insights from Sifnos Island (south Aegean Sea)

Author

Aravadinou, E., Xypolias, P., Chatzaras, V., Iliopoulos, I., Gerogiannis, N., Structural geology and EM, and EU-RHEOMANTLE: Evolution of mantle rheology in exhumed strike-slip faults

Subjects
Blueschist, 010504 meteorology & atmospheric sciences, Hellenides, CYCLADES, Tectonic phase, High-pressure metamorphism, 010502 geochemistry & geophysics, 01 natural sciences, Ductile thrust, Nappe, Ductile deformation, Alpine orogeny, General Earth and Planetary Sciences, Eclogite, Shear zone, Structural geology, Petrology, Seismology, Geology, 0105 earth and related environmental sciences
Abstract

New geological and structural mapping combined with kinematic and amphibole chemistry analyses is used to investigate the deformation history of the Cycladic Blueschist Unit (CBU) on Sifnos Island (Cyclades, Aegean Sea). We concentrate on north Sifnos, an area characterized by exceptionally well-preserved eclogites and blueschists. Our data show that the early, main phase (D2) of ductile deformation in the CBU occurred synchronous with the transition from prograde to close-to-peak retrograde conditions. This deformation phase took place at middle Eocene and is related to ESE-directed thrusting that emplaced the metavolcano-sedimentary subunit over the Marble subunit. The subsequent exhumation-related (D3) deformation is characterized by gently NE-plunging folds and NE-directed contractional shear zones that formed parallel to the axial planes of folds. NE-directed shearing occurred under blue- schist and transitional blueschist-/greenschist-facies conditions during late Eocene–Oligocene and caused the restacking of the early nappe pile. We suggest that a mechanism of ductile extrusion of the CBU in a tectonic setting of net compression could explain better the recorded exhumation-related deformation than a mechanism of syn- and post-orogenic extension. Our new kinematic results in combination with previous works in the Cyclades area reveal a regional scale change in tectonic transport direction from (W)NW–(E)SE at Late Cretaceous–middle Eocene to (E)NE–(W)SW at late Eocene–Oligocene times. The observed change in transport direction may be governed by the relative motion of Africa with respect to Europe during Alpine orogeny.

Published
2016

6. Ductile nappe stacking and refolding in the Cycladic Blueschist Unit: insights from Sifnos Island (south Aegean Sea)

Author

Structural geology and EM, EU-RHEOMANTLE: Evolution of mantle rheology in exhumed strike-slip faults, Aravadinou, E., Xypolias, P., Chatzaras, V., Iliopoulos, I., Gerogiannis, N., Structural geology and EM, EU-RHEOMANTLE: Evolution of mantle rheology in exhumed strike-slip faults, Aravadinou, E., Xypolias, P., Chatzaras, V., Iliopoulos, I., and Gerogiannis, N.

Published
2016

11. Outcome in severely head injured patients with and without multiple trauma.

Author

Baltas I, Gerogiannis N, Sakellariou P, Matamis D, Prassas A, and Fylaktakis M

Subjects
Adolescent, Adult, Craniocerebral Trauma therapy, Glasgow Coma Scale, Humans, Middle Aged, Multiple Trauma therapy, Treatment Outcome, Craniocerebral Trauma complications, Craniocerebral Trauma mortality, Multiple Trauma complications, Multiple Trauma mortality
Abstract

Background: This work attempts to analyse the potential role of multiple injury in the outcome of non-shock severely head injured patients with a Glasgow Coma Scale (GCS) of 8 or less., Methods: 386 non-shock adult patients of < 65 years (mean age 33.74 +/- 14.7), treated with the same therapeutic protocol, were studied retrospectively. Multiple traumatised patients classified into Injury Severity Scale (ISS) of < or = 9 and > 9. The ISS classification was also tested in two subgroups of patients with GCS 3-5 and GCS 6-8., Results: The overall mortality of the 386 patients was 22.79%. Those suffering from extracranial injuries (n = 146, 37.82%) and those without (n = 240), presented similar mortality (21.23% vs 23.75% respectively). The multiple traumatised victims presented mean ISS 9.3 +/- 8.17. Those with ISS > 9 had greater mortality than those with ISS < or = 9, but the difference was not statistically significant (p > 0.05). The influence of ISS was not also significant in the mortality, either patients were of GCS 3-5 or GCS 6-8., Conclusions: Multiple trauma in non-shock patients, as it is expressed by ISS does not have any influence on mortality. Mortality is depending on the severity of the intracranial pathology. Perhaps head injury and extracranial injuries have synergistic effect on morbidity.

Published
1998

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