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Geological history of ophiolites in the Lesser Caucasus and correlation with the Izmir-Ankara-Erzincan suture zone; insights from radiolarian biochronology

Taniel Danelian, Gayane Asatryan, Ghazar Galoyan, Marc Sosson, Lilit Sahakyan, Martial Caridroit and Ara Avagyan
Geological history of ophiolites in the Lesser Caucasus and correlation with the Izmir-Ankara-Erzincan suture zone; insights from radiolarian biochronology (in Radiolarian biochronology as a key to tectono-stratigraphic reconstructions, Taniel Danelian (editor) and Spela Gorican (editor))
Bulletin de la Societe Geologique de France (September 2012) 183 (4): 331-342

Abstract

Three distinct radiolarian assemblages were obtained in this study; two of them were extracted from large blocks of radiolarites included in a melange NW of Lake Sevan (Dzknaget). The latest Tithonian-Late Valanginian assemblage comes from a coherent sequence of 6-7 m-thick radiolarites with intercalations of lavas and rounded blocks of shallow-water limestones. The Late Barremian-Early Aptian assemblage found in the second block allows correlation with radiolarites dated recently in Karabagh. A third radiolarian assemblage comes from Vedi and establishes that radiolarian ooze was accumulated in the Tethyan realm of the Lesser Caucasus until at least the middle Albian. A synthesis of all available micropaleontological (radiolarian) and geochronological ages for the ophiolites present in Armenia and Karabagh points to the following scenario for their geological evolution: the initial phase of oceanic floor spreading was under way during the Late Triassic (Carnian) or even slightly before; the bulk of oceanic lithosphere preserved today in the Lesser Caucasus was formed during the Jurassic; evidence for subaerial volcanic activity is recorded in tuffite intercalations in the Middle-Upper Jurassic radiolarian cherts; an oceanic volcanic plateau was formed during the Late Barremian-Aptian (or possibly even before) while the obduction of ophiolites took place during the Coniacian-Santonian. The geological history of ophiolites in the Lesser Caucasus shares a number of similarities with the Izmir-Ankara-Erzincan suture zone (i.e. initiation of ocean spreading during the Carnian, obduction after the Cenomanian), but there are also some differences especially with respect to the timing of the oceanic plateau emplacement.


ISSN: 0037-9409
EISSN: 1777-5817
Coden: BSGFAE
Serial Title: Bulletin de la Societe Geologique de France
Serial Volume: 183
Serial Issue: 4
Title: Geological history of ophiolites in the Lesser Caucasus and correlation with the Izmir-Ankara-Erzincan suture zone; insights from radiolarian biochronology
Title: Radiolarian biochronology as a key to tectono-stratigraphic reconstructions
Author(s): Danelian, TanielAsatryan, GayaneGaloyan, GhazarSosson, MarcSahakyan, LilitCaridroit, MartialAvagyan, Ara
Author(s): Danelian, Tanieleditor
Author(s): Gorican, Spelaeditor
Affiliation: University of Lille I, Department of Earth Sciences, Villeneuve d'Ascq, France
Affiliation: University of Lille I, Department of Earth Sciences, Villeneue d'Ascq, France
Pages: 331-342
Published: 201209
Text Language: English
Summary Language: French
Publisher: Societe Geologique de France, Paris, France
Meeting name: 19th congress of the Carpathian-Balkan Geological Association
Meeting location: Salonika, GRC, Greece
Meeting date: 20120925Sept. 25, 2010
References: 77
Accession Number: 2012-088895
Categories: Stratigraphy
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 3 plates, 1 table, geol. sketch map
N39°00'00" - N41°00'00", E44°00'00" - E47°00'00"
Secondary Affiliation: Ivan Rakovec Institute of Paleontology, SVN, SloveniaNational Academy of Sciences of Armenia, Institute of Geological Sciences, ARM, ArmeniaUniversity of Nice-Sophia Antipolis, FRA, France
Country of Publication: France
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Societe Geologique de France. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201246
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