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Radiolarian biostratigraphic constraints for latest Jurassic-earliest Cretaceous submarine volcanic activity in the Tethyan oceanic realm of the Sevan Ophiolite (Armenia)

Gayane Asatryan, Taniel Danelian, Lilit Sahakyan, Ghazar Galoyan, Monique Seyler, Marc Sosson, Ara Avagyan, Benoit L. M. Hubert and Sandra Ventalon
Radiolarian biostratigraphic constraints for latest Jurassic-earliest Cretaceous submarine volcanic activity in the Tethyan oceanic realm of the Sevan Ophiolite (Armenia) (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): 319-330

Abstract

Biostratigraphic constraints for the sedimentary cover of the ophiolites preserved in Armenia are of key importance for the palaeogeographic and geodynamic reconstruction of the greater area between Eurasia and the South-Armenian block, which is a micro-continent of Gondwanian origin. We present here radiolarian data obtained from radiolarites that are intercalated in a sequence of mafic volcanic rocks on the northern flank of the Dali valley (east of Lake Sevan), which is considered to be part of the Sevan ophiolite. Mafic sills and dykes with well-preserved igneous textures are probably part of the same sequence. The pseudomorphosis of primary phases indicates that the igneous rocks are strongly affected by alteration in the greenschist facies condition. The plagiogranites that are present in this locality appear to be intrusive into the mafic sequence. The radiolarian assemblages extracted from radiolarian cherts intercalated in the mafic volcanic rocks are dated as latest Tithonian-Late Valanginian; they contain metric rounded blocks of oolitic limestones with crinoid fragments, suggesting that these shallow water limestones slid during the Jurassic/Cretaceous transition into a rugged oceanic floor in which radiolarian ooze accumulated.


ISSN: 0037-9409
EISSN: 1777-5817
Coden: BSGFAE
Serial Title: Bulletin de la Societe Geologique de France
Serial Volume: 183
Serial Issue: 4
Title: Radiolarian biostratigraphic constraints for latest Jurassic-earliest Cretaceous submarine volcanic activity in the Tethyan oceanic realm of the Sevan Ophiolite (Armenia)
Title: Radiolarian biochronology as a key to tectono-stratigraphic reconstructions
Affiliation: National Academy of Sciences of Armenia, Institute of Geological Sciences, Yerevan, Armenia
Affiliation: University of Lille I, Department of Earth Sciences, Villeneue d'Ascq, France
Pages: 319-330
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: 64
Accession Number: 2012-088894
Categories: Stratigraphy
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., strat. col., 4 plates, 1 table, geol. sketch map
N40°15'00" - N40°25'00", E45°22'00" - E45°52'00"
Secondary Affiliation: Ivan Rakovec Institute of Paleontology, SVN, SloveniaUniversity of Lille I, FRA, FranceUniversity of Nice-Sophia Antipolis, FRA, FranceCatholic University of Lille, 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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