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Neogene volcanism in Elazig-Tunceli area (eastern Anatolia); geochronological and petrological constraints

Samuele Agostini, Mehmet Yilmaz Savascin, Paolo Di Giuseppe, Flavio Di Stefano, Ozgur Karaoglu, Michele Lustrino, Piero Manetti, Yalcin Ersoy, Sevcan Kurum and Ayten Oztufekci Onal
Neogene volcanism in Elazig-Tunceli area (eastern Anatolia); geochronological and petrological constraints
Italian Journal of Geosciences (October 2019) 138 (3): 435-455

Abstract

The Elazig and Tunceli provinces in eastern Anatolia host a complex succession of Miocene-Pleistocene effusive and explosive volcanic rocks, divided into four distinct volcanic phases. The most abundant and widespread products are the calcalkaline Mazgirt volcanic rocks, characterized by wide Sr isotope variations (87Sr/86Sr approximately 0.7054-0.7077) and narrower 143Nd/144Nd ( approximately 0.51246-0.51260) and Pb isotopes (e.g., 206Pb/204Pb approximately 18.89-19.13). New 40Ar-39Ar ages indicate that Mazgirt volcanic activity occurred between approximately 16.3 and 15.1 Ma. The other three volcanic phases are represented by the Tunceli mildly alkaline basaltic lavas ( approximately 11.4-11.0 Ma), the Pliocene Karakocan ( approximately 4.1 Ma) and Pleistocene Elazig ( approximately 1.9-1.6 Ma) Na-alkali basaltic lavas with clear OIB-like geochemical signature. Mazgirt volcanics can be subdivided on the base of mode of emplacement into lava flows and lava domes units characterized by petrographic, chemical and isotopic differences: lava flows are calcalkaline, whereas lava domes mostly belong to a high-K calcalkaline series and are, on average, more LREE- and 87Sr-enriched. Lava domes are more porphyritic, with a phenocryst assemblage dominated by amphibole, whereas plagioclase and clinopyroxene are the most abundant phenocryst phases in lava flows, pointing out that evolution of dome magmas occurred in conditions of slightly higher pressure, favouring the crystallization of hydrous phases. The Karabakir Formation, previously reported as late Miocene-Pliocene, encloses Mazgirt volcanics and is capped by Tunceli basalts. These new age data constrain the Karabakir Formation emplacement from early to late Miocene. The evolution of this igneous activity mirrors the geodynamic framework of the region: the early-middle Miocene Mazgirt volcanics represent arc volcanism related to Eurasia-Arabia convergence. The late Miocene Tunceli basalts postdate the onset of post-collisional tectonics in Eastern Anatolia, whereas the Karakocan and Elazig volcanic rocks were emplaced after the initiation of strike-slip motion on the North Anatolian and East Anatolian Fault systems.


ISSN: 2038-1719
EISSN: 2038-1727
Coden: BOGIAT
Serial Title: Italian Journal of Geosciences
Serial Volume: 138
Serial Issue: 3
Title: Neogene volcanism in Elazig-Tunceli area (eastern Anatolia); geochronological and petrological constraints
Affiliation: CNR, Istituto di Geoscienze e Georisorse, Pisa, Italy
Pages: 435-455
Published: 201910
Text Language: English
Publisher: Societa Geologica Italiana, Rome, Italy
References: 73
Accession Number: 2019-098244
Categories: Structural geologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 1 table, geol. sketch maps
N38°45'00" - N39°15'00", E39°00'00" - E40°00'00"
Secondary Affiliation: Munzur Universitesi, TUR, TurkeyUniversita La Sapienza, ITA, ItalyEskisehir Osmangazi Universitesi, TUR, TurkeyUniversita di Firenze, ITA, ItalyDokuz Eylul Universitesi, TUR, TurkeyFirat Universitesi, TUR, Turkey
Country of Publication: Italy
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Societa Geologica Italiana. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2019
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