New evidences of Holocene tectonic and volcanic activity of the western part of Lake Sevan (Armenia)

• Autorzy: Avagyan Ara , Sahakyan Lilit , Meliksetian Khachatur , Karakhanyan Arkadi , Lavrushin Vasily , Atalyan Tatul , Hovakimyan Hayk , Avagyan Seda , Tozalakyan Petros , Shalaeva Evgenia , Chatainger Christine , Sokolov Sergey , Sahakov Arkadi , Alaverdyan Gagik

Identyfikatory

DOI

10.7306/gq.1530

• Języki publikacji: EN

Abstrakty

EN

The purpose of this paper is to present new data on active geological processes in the Lake Sevan Basin and to show its multidisciplinary aspects. The investigations of its structures, recent lake sediments, and lake floor gas emission allow a better understanding of the history of geological development and the recent tectonic and volcanic activity of the basin. This paper summarizes underwater investigations of active geological features of Lake Sevan, undertaken for the first time in Armenia. More than 30 aligned underwater-source related gas emission points were discovered. The gas contains carbon dioxide of volcanic or volcanogenic-metamorphogenic origin and can be related to unloading of deep fluid systems. This allows defining the Noratus-Kanagegh Fault segment trace below the recent Lake Sevan floor sediments. The discovery of the subaqueous segment of active fault shows the presence of another natural hazard of lake tsunami related to possible future co-seismic rupture. The recent sediments of the northwestern Lake Sevan coastline are sandwiched between two blocky lava flows. The radiocarbon dating of bones of bovine mammals (with entire skull), found ~15 cm from the cover of the lake sediments, suggests that the upper blocky basaltic-andesite layer can be a result of eruption younger than ~3400 years BP. About 80 m of the Noratus sequence sediments have been sampled for palaeomagnetic study and the age of 3.1-2.3 Ma for the lower part (42 m) is obtained. The upper and post-Gelasian activity of the Noratus-Kanagegh Fault is proven by a cross-cutscoria layer of 2.30 ±0.15 Ma K/Ar age.

Słowa kluczowe

EN

active fault; gas emission; lake sediments; palaeomagnetism; lake tsunami

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2020
• Tom: Vol. 64, No. 2
• Strony: 288--303
• Opis fizyczny: Bibliogr. 43 poz., fot., rys., tab.

Twórcy

autor

Avagyan Ara

• Academy of Sciences of Armenia, Institute of Geological Sciences, Baghramyan 24a, 0019 Yerevan, Armenia

autor

Sahakyan Lilit

• Academy of Sciences of Armenia, Institute of Geological Sciences, Baghramyan 24a, 0019 Yerevan, Armenia

autor

Meliksetian Khachatur

• Academy of Sciences of Armenia, Institute of Geological Sciences, Baghramyan 24a, 0019 Yerevan, Armenia

autor

Karakhanyan Arkadi

• Academy of Sciences of Armenia, Institute of Geological Sciences, Baghramyan 24a, 0019 Yerevan, Armenia

autor

Lavrushin Vasily

• Geological Institute of the Russian Academy of Sciences (RAS), 7 Pyzhevsky, Moscow 119017, Russia

autor

Atalyan Tatul

• Academy of Sciences of Armenia, Institute of Geological Sciences, Baghramyan 24a, 0019 Yerevan, Armenia

autor

Hovakimyan Hayk

• Academy of Sciences of Armenia, Institute of Geological Sciences, Baghramyan 24a, 0019 Yerevan, Armenia

autor

Avagyan Seda

• Academy of Sciences of Armenia, Institute of Geological Sciences, Baghramyan 24a, 0019 Yerevan, Armenia

autor

Tozalakyan Petros

• Academy of Sciences of Armenia, Institute of Geological Sciences, Baghramyan 24a, 0019 Yerevan, Armenia

autor

Shalaeva Evgenia

• Geological Institute of the Russian Academy of Sciences (RAS), 7 Pyzhevsky, Moscow 119017, Russia

autor

Chatainger Christine

• Archeorient UMR 5133 CNRS, Maison de l'Orient et de la Mediterranee, Jean Pouilloux, 7 rue Raulin, 69365 Lyon, France

autor

Sokolov Sergey

• Geological Institute of the Russian Academy of Sciences (RAS), 7 Pyzhevsky, Moscow 119017, Russia

autor

Sahakov Arkadi

• Academy of Sciences of Armenia, Institute of Geological Sciences, Baghramyan 24a, 0019 Yerevan, Armenia

autor

Alaverdyan Gagik

• Academy of Sciences of Armenia, Institute of Geological Sciences, Baghramyan 24a, 0019 Yerevan, Armenia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).