Geology of Ammouliani Island (Northern Greece) – implications for the tectono-magmatic evolution of the Serbo-Macedonian Massif

Plougarlis, Anastasios; Τρανός, Μάρκος Δ.

doi:10.1080/17445647.2014.948504

Cited by 6 publications

(23 citation statements)

References 15 publications

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“…The contact, however, between the Vertiskos and Kerdyllion Units is not a normal contact, as mapped by Kockel et al (1977) in the central-eastern part of the Chalkidiki peninsula, but a tectonic contact, as already indicated in other parts of the Serbo-Macedonian massif (i.e., Sakellariou, 1989;1993;Burg, 1995;1996;Plougarlis and Tranos, 2014), and more precisely a large mylonitic shear zone with top-to-the-S sense of shear. Nonetheless, the tectonic contact between the Vertiskos and Kerdyllion Units is more complicated since it is locally inverted resulting in the sandwich of the rocks of the Vertiskos Unit between the rocks of the Kerdyllion Unit.…”

Section: Discussion-conclusionmentioning

confidence: 77%

“…The leucosomes of the quartzofeldspathic gneiss, concordantly emplaced and sheared along with the amphibolite and biotite gneisses, lithologically refer to an initial granitic melt. They can be juxtaposed with either the Ammouliani Unit, described as quartzofeldspathic gneisses and anatexites-granitic gneisses by Plougarlis and Tranos (2014) or the plagioclase-microcline gneiss, described by Kockel et al (1977). The migmatization signs the leucosomes bear in the study area advocate more towards its relation with the Ammouliani Unit.…”

Section: Discussion-conclusionmentioning

confidence: 99%

“…As already mentioned, Dixon and Dimitriadis (1984) considered the mafic and ultramafic rocks, and more specifically the complexes of Therma, Volvi, and Gomati as ophiolite complexes that are frequently present along the contact between Vertiskos and Kerdyllion Units, implying that the contact between Vertiskos and Kerdyllion Units is tectonic, a conclusion which is also enforced by the presence of extensive shearing along the afore-mentioned contact in adjacent study areas (Sakellariou, 1989;Sakellariou and Durr, 1993;Himmerkus, 2005;Plougarlis and Tranos, 2014).…”

Section: Geological Settingmentioning

confidence: 99%

“…However, since then, later studies provided new subdivisions of the crystalline rocks. For example, a new unit, namely Ammouliani Unit between the Kerdyllion and Vertiskos Units, has been suggested by Plougarlis and Tranos (2014), the Kerdyllion Unit was incorporated to the Rhodope massif (Burg et al, 1995;Ricou et al, 1998;Brun and Sokoutis, 2004;2007, Himmerkus et al, 20072011), and the Vertiskos Unit was considered as a separated individual tectonic terrane (Burg et al, 1995;1996; 2012 and references therein). The study area is also indicated at the northern part of the Athos Peninsula.…”

Section: Introductionmentioning

confidence: 99%

“…The study area is also indicated at the northern part of the Athos Peninsula. Modified after Kockel et al (1977) and Plougarlis and Tranos (2014). Kockel and Mollat, I.G.M.R.…”

Section: Introductionmentioning

confidence: 99%

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Geology and deformation of the Serbo-Macedonian massif in the northern part of the Athos Peninsula, Northern Greece: Insights from two detailed cross-sections

2020

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The Athos peninsula occupies the south-eastern part of the wider Chalkidiki peninsula in Central Macedonia, Greece. It is mainly built up by crystalline rocks belonging to the Serbo-Macedonian massif, traditionally constituting, along with the Rhodope massif, the Hellenic hinterland. According to the basic geological map of the peninsula, its northern part is mainly composed of marbles grouped into the Kerdyllion Unit, and biotite gneisses and two-mica gneisses grouped into the Vertiskos Unit of the Serbo-Macedonian massif, whereas the contact between the units is considered as a normal contact, although it has been re-evaluated as tectonic later on. Moreover, amphibolites and ultramafic rocks exist along with the previously mentioned rocks, making the geology and relationship between the two units much more complicated. Two detailed cross-sections and structural analysis permit us to revise the geology of the region concluding that the marbles, the amphibolite gneisses, formerly independent amphibolites, and the biotite gneisses belong to the Kerdyllion Unit that is strongly characterized by migmatization and anatexis, whereas the Vertiskos Unit is represented predominantly by two-mica gneisses that were not extensively, if at all, affected by these phenomena. Isoclinal folding and intense shearing with an overall top-to-the-S sense of shear resulted in the main fabric of the rocks and the mylonitic shear zone between the units. More importantly, the two-mica gneiss of the Vertiskos Unit is sandwiched between the rocks of the Kerdyllion Unit. We attribute both isoclinal folding and shearing to a Mesozoic tectonic event associated with an amphibolite facies metamorphism, leading to an Alpine reworking of the Serbo-Macedonian massif. This Alpine reworking continues during Eocene times with an ENE-WSW compression, giving rise to asymmetric to inverted folds, co-axially refolding pre-existing fabrics and structures. Our work strongly suggests that the overall structure and tectono-stratigraphy concerning the Vertiskos and Kerdyllion Units as well as the contact between them should not be based on the existence of the marbles, as traditionally followed up till now, but on the migmatization and anatexis processes that are almost absent from the rocks of the Vertiskos Unit.

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Section: Discussion-conclusionmentioning

confidence: 77%

Section: Discussion-conclusionmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The study area is also indicated at the northern part of the Athos Peninsula. Modified after Kockel et al (1977) and Plougarlis and Tranos (2014). Kockel and Mollat, I.G.M.R.…”

Section: Introductionmentioning

confidence: 99%

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Geology and deformation of the Serbo-Macedonian massif in the northern part of the Athos Peninsula, Northern Greece: Insights from two detailed cross-sections

2020

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Geothermal resources assessment using temperature–depth relationships in the fault-controlled hydrothermal system of Aristino-Traianoupolis area, Northern Greece

Dalampakis¹,

Papachristou

Neofotistos

2022

Geotherm Energy

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Aristino-Traianoupolis area hosts one of the most significant water-dominated low-temperature geothermal fields in Greece. It is located on the southwestern uplifted margin of the Tertiary Evros Delta molassic basin, 10 km east of the town of Alexandroupolis (Thrace, NE Greece). The upper hydrothermal system of the Aristino Geothermal Field (AGF), one of the most promising in continental Greece, contains fluids with temperatures ranging from 51 to 99 °C, within a series of overlapping aquifers at very low depths (100–430 m). The main geothermal anomaly for temperatures higher than 90 °C covers an area of 6 km2, to a maximum prospected depth of 500 m below ground surface. The scattered regional anomaly exceeds 50 km2 and is characterized by excessively high and abruptly changing thermal gradient (42 to 450 °C/km) and heat flow (80–800 mW/m2), that are both typical of a fault-controlled hydrothermal system. Since 1993, the AGF has undergone non-systematic geothermal investigation, with emphasis on low-depth (100–500 m) drilling. This paper provides, for the first time, a synthetic and detailed evaluation of all available temperature data gathered in the last 25 years. The steady-state temperature logs reveal the dominant role of conduction for the upper geothermal system, accompanied, in most cases, by rapidly changing and abnormally high thermal gradients (100–450 °C/km), triggered, most probably, by a deeper system of higher temperature. This hypothesis is also supported by the applied chemical geothermometers, which suggest initial fluid temperatures at 140–150 °C, the hydrochemical characteristics of the fluids hosted in the deeper and most promising investigated reservoir (ignimbrite) of the upper system, and the extrapolated temperatures from the conductive temperature–depth profiles. The lower widespread medium enthalpy hydrothermal system should extend at depths 500–1000 m within volcanics and the expected Eocene limestones and basal clastic series of the Tertiary sequence that have filled the basin. Nevertheless, these assumptions need to be verified by appropriate investigations and new drillings at depths greater than 600–700 m, which would confirm the presence of a productive medium enthalpy reservoir.

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The tectonostratigraphic architecture of the Serbo-Macedonian massif in the Vertiskos and Kerdilion mountains (Northern Greece)

2021

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The lithologies and structural features of the exposed rocks of the Serbo-Macedonian massif in the Vertiskos and Kerdilion Mts. have been studied in detail by carrying out km-long cross-sections. Moreover, a new tectonostratigraphic architecture for the massif is proposed, based on the migmatization and anatexis that the rocks pertain, under which the specific exposed rocks have been placed into the Vertiskos and Kerdilion Units. The latter approach differs from the traditional view, which is based solely on the lithological difference between the units. In particular, in the Vertiskos Mt., mica schists, garnet-bearing two-mica gneisses, and predominantly two-mica gneisses, without a sign of anatexis and migmatization, overlie tectonically, biotite gneisses and layered amphibolite gneisses into which migmatization and anatexis takes place. The former constitute the Vertiskos Unit, whereas the latter have been grouped into the Kerdilion Unit, since they are of similar lithologies and affinities with rocks of the Kerdilion Unit. The Kerdilion Mt. is a large antiform made up of biotite gneisses alternating with marbles, which are similarly characterized by intense migmatization and anatexis. These rocks are intruded by the Oreskia granite, which is foliated and follows the general trend of the country rocks. All the rocks are folded with isoclinal to tight folds, and the contact between the two units is a mylonitic shear zone with a top-to-the-SW sense-of-shear. Also, a large volume of ultramafic rocks occurs between the Vertiskos and Kerdilion Mts., including metamorphosed rocks like metagabbros to massive amphibolites, which is assigned to the Therma-Volvi-Gomati Complex (TVGC). These rocks have been found in tectonic contact, i.e., shear zones with top-to-the-SW sense-of-shear, only with the rocks of the Kerdilion Unit. Taking into account our new tectonostratigraphic architecture, the contact between the Vertiskos and Kerdilion Units is not located along the western side of the marbles, as the latter are exposed in the Kerdilion Mt. It is traced westerly in the Vertiskos Mt. dipping with intermediate angles towards the SW, due to NW-trending, map-scale, isoclinal folding. The ultramafic rocks of the TVGC are in tectonic contact with the rocks of the Kerdilion Unit, but not the two-mica gneisses of the Vertiskos Unit, and the Arnea granite intrudes not only the Vertiskos Unit as previously considered, but the rocks of the Kerdilion Unit, as well.

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Geology of Ammouliani Island (Northern Greece) – implications for the tectono-magmatic evolution of the Serbo-Macedonian Massif

Cited by 6 publications

References 15 publications

Geology and deformation of the Serbo-Macedonian massif in the northern part of the Athos Peninsula, Northern Greece: Insights from two detailed cross-sections

Geology and deformation of the Serbo-Macedonian massif in the northern part of the Athos Peninsula, Northern Greece: Insights from two detailed cross-sections

Geothermal resources assessment using temperature–depth relationships in the fault-controlled hydrothermal system of Aristino-Traianoupolis area, Northern Greece

The tectonostratigraphic architecture of the Serbo-Macedonian massif in the Vertiskos and Kerdilion mountains (Northern Greece)

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