Determination of local active tectonics regime in central and northern Greece, using primary geodetic data

Lazos, Ilias; Pikridas, Christos; Chatzipetros, Alexandros; Pavlides, Spyros

doi:10.1007/s12518-020-00310-x

Cited by 14 publications

(12 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The oldest is contemporaneous with the Cretaceous amphibolite facies metamorphic event and exhibits an ENE-WSW extensional trend and eastward-trending shears. The youngest extensional event occurred during the Late Cretaceous and Middle Eocene (68.5 ± 3.8 to 46.6 ± 3.6 Ma) and continued through to the Miocene [21,32,33]. The faults of this event structurally controlled the intrusions related to the second and the third Cenozoic magmatic events [19,20].…”

Section: Geological Settingmentioning

confidence: 96%

The Geology, Geochemistry, and Origin of the Porphyry Cu-Au-(Mo) System at Vathi, Serbo-Macedonian Massif, Greece

et al. 2021

Self Cite

View full text Add to dashboard Cite

The Vathi porphyry Cu-Au ± Mo mineralization is located in the Serbo-Macedonian metallogenic province of the Western Tethyan Metallogenic Belt. It is mainly hosted by a latite and is genetically associated with a quartz monzonite intrusion, which intruded the basement rocks of the Vertiskos Unit and the latite, 18 to 17 Ma ago. A phreatic breccia crosscuts the latite. The quartz monzonite was affected by potassic alteration, whereas the latite was subjected to local propylitic alteration. Both styles of alteration were subsequently overprinted by intense sericitic alteration. M-type and A-type veins are spatially associated with potassic alteration, whereas D-type veins are related to the sericitic alteration. Three ore assemblages are associated with the porphyry stage: (1) pyrite + chalcopyrite + bornite + molybdenite + magnetite associated with potassic alteration; (2) pyrite + chalcopyrite related to propylitic alteration; and (3) pyrite + chalcopyrite + native gold ± tetradymite associated with sericitic alteration. A fourth assemblage consisting of sphalerite + galena + arsenopyrite + pyrrhotite + pyrite ± stibnite ± tennantite is related to an epithermal overprint. Fluid inclusion data indicate that the A-type veins and related porphyry-style mineralization formed at 390–540 °C and pressures of up to 646 bars (<2.6 km depth) from boiling hydrothermal fluids. A later condensation of vapor-rich inclusions resulted in a moderately saline fluid (8.4–11.2 wt % NaCl equiv) at temperatures between 311 and 392 °C, which were related to sericitic alteration, D-type veins, and associated metallic mineralization. Subsequent dilution of the moderately saline fluid at lower temperatures (205–259 °C) produced a less saline (1.4–2.9 wt % NaCl equiv.) fluid, which is likely associated with the late epithermal overprint.

show abstract

Section: Geological Settingmentioning

confidence: 96%

The Geology, Geochemistry, and Origin of the Porphyry Cu-Au-(Mo) System at Vathi, Serbo-Macedonian Massif, Greece

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…http://gredass.unife.it), which are currently being studied using advanced methods (satellite imagery analysis, high resolution UAV models, geodetic, geological and paleoseimological ones; e.g. Tsodoulos et al, 2016;Kremastas et al, 2018;Lazos et al, 2021). It is worth mentioning at this point that the first author who referred to earthquakes as a possible cause of formation of Tempi valley, with the contribution of God Poseidon, was the historian Herodotus (485-425 BC).…”

Section: Volume 58mentioning

confidence: 99%

The northern Thessaly strong earthquakes of March 3 and 4, 2021, and their neotectonic setting

Chatzipetros¹,

Pavlides

Foumelis

et al. 2021

geosociety

Self Cite

View full text Add to dashboard Cite

A sequence of earthquakes occurred on March 3rd and 4th in Northern Thessaly, northern Greece, associated with previously unknown, blind normal faults within the crystalline Palaeozoic basement of the Pelagonian geotectonic zone. Surficial ground deformation, such as liquefaction phenomena in fluvial plains, as well as soil fissures and rock falls, have been mapped. Geological indications of the unmapped seismic fault, i.e., reactivated shear zones, open cracks, etc., have been identified within the bedrock. Based on geological indications, the main fault projection to the surface could be considered a 15 km NW-SE trending structure and average dip of 45o to the NE. The seismic source of the main shock was modelled, and the Coulomb static stress changes calculated for receiver faults similar to the source. The determination of the active tectonic regime of the region by geodetic data and the well-known faults of NE Thessaly plain are also presented, as well as the revised historical and instrumental seismicity. This earthquake raises new concerns and challenges, revising some established views, such as the status of main stress orientations, the orientation of active tectonic structures, the occurrence of a seismogenic fault in a mountainous massif of crystalline rocks without typical geomorphological expression and the role of blind faults in Seismic Hazard Assessment.

show abstract

“…The maximum horizontal extension (MHE, e1H) is defined as MHE = ( -0)/ 0, where is the final length along the longest axis of the strain ellipse and 0 is the original length, is expressed in nano-strain and it's an indicator of tectonic activity in an area; its direction is perpendicular to the strike of the active fault zones [25]. The minimum horizontal extension (e2H) is defined in a similar way, but along the shortest axis of the strain ellipse.…”

Section: Triangulation Methodology -Strain Regime In the Areamentioning

confidence: 99%

Detection of Tectonic and Crustal Deformation using GNSS Data Processing: The Case of PPGnet

et al. 2021

View full text Add to dashboard Cite

Aitolo-Akarnania prefecture, western Greece, is an area with strong earthquakes and large active fault systems. The most prominent are the Katouna sinistral strike slip fault and the Trichonis Lake normal fault system. Their proximity to large cities, and the lack of detailed information on their seismogenic potential, calls for multiparametric research. Since 2013, the area’s crustal deformation has been monitored by a dense GNSS Network (PPGNet), consisting of five stations, equipped with Leica and Septentrio receivers. The objective of this network is to define the rate of deformation across these two main fault systems. Data is recorded using two sampling frequencies, 1 Hz and 10Hz, producing hourly and daily files. Daily data is processed using Bernese GNSS Processing Software using final orbits of International GNSS Service. Double-difference solution is computed using phase measurements from the PPGNet network complemented by four stations from Athens’ National Observatory GNSS network and six stations from METRICA network. First results show a NNE movement at PVOG station of 12 mm/y and a similar movement at RETS station of about 9 mm/y. This means that the Trichonis Lake normal fault system, located between these two stations, depicts a slip rate of 3 mm/y. KTCH and RGNI stations move eastwards at a velocity of about 5 mm/y due to the Katouna-Stamna fault system. Data from PPGNet has provided important results on crustal deformation in the area, i.e. slip rates have been attributed to specific fault systems. The comparison and links of these data with broader geodynamic models is now possible and we expect, in a later phase that will provide a more detailed image of the associated seismic hazard for Aitolo-Akarnania. Doi: 10.28991/cej-2021-03091633 Full Text: PDF

show abstract

Determination of local active tectonics regime in central and northern Greece, using primary geodetic data

Cited by 14 publications

References 28 publications

The Geology, Geochemistry, and Origin of the Porphyry Cu-Au-(Mo) System at Vathi, Serbo-Macedonian Massif, Greece

The Geology, Geochemistry, and Origin of the Porphyry Cu-Au-(Mo) System at Vathi, Serbo-Macedonian Massif, Greece

The northern Thessaly strong earthquakes of March 3 and 4, 2021, and their neotectonic setting

Detection of Tectonic and Crustal Deformation using GNSS Data Processing: The Case of PPGnet

Contact Info

Product

Resources

About