Marjolein N. Naudé

Utrecht University

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Paul R.D. Mason

Utrecht University

Annique van der Boon

University of Oslo

A. R. Niknam

Shahid Beheshti University

Petrus le Roux

University of Cape Town

Cor G. Langereis

Utrecht University

Mahnaz Rezaeian

Institute for Advanced Studies in Basic Sciences

Leo M. Kriegsman

Naturalis Biodiversity Center

Laura J. Cotton

Natural History Museum Aarhus

Iman Monsef

Institute for Advanced Studies in Basic Sciences

Sara Callegaro

University of Oslo

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Utrecht University

Institute for Advanced Studies in Basic Sciences

University of Liverpool

University of Oslo

Shahid Beheshti University

Naturalis Biodiversity Center

University of Münster

Commonwealth Scientific and Industrial Research Organisation

Imperial College London

Birkbeck, University of London

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Propagating Neotethys slab break-off beneath Iran following Arabia-Eurasia collision

Lithos (2024)

Annique van der Boon Marjolein N. Naudé Sara Callegaro Iman Monsef Mahnaz Rezaeian

The closure of the Paleo- and Neotethys resulted in a long history of subduction of oceanic crust and production of a large variety of Phanerozoic magmatic rocks in the region occupied by present day Iran. Adakitic rocks of varying ages are common in this area and have distinctive geochemical signatures that have been variably linked to slab break-off or melting of the lower continental crust. The geographic distribution and age of the adakitic rocks indicates a potential younging trend from northwest to southeast Iran, but this trend was interrupted by an older outlier in the area of Tafresh, in the central part of the Neotethys arc. We obtained new geochemical and U-Pb geochronological data for Eocene volcanic and Miocene intrusive rocks from this anomalous locality. Our results show that adakitic signatures are only present in younger Miocene intrusive porphyritic bodies and not in the main calc-alkaline Eocene volcanic succession as previously thought. The Tafresh adakitic porphyritic bodies have an age of 15.7 ± 0.1 Ma (n = 183, 2σ SE), which fits well with a regional younging of the adakites towards the southeast of Iran. The Tafresh adakitic rocks are classified as the high-silica variety, and show trace element signatures and isotopic values that are consistent with melting of the lower continental crust. We hypothesise that progressive slab break-off provided a mechanism for the formation of high-silica adakitic rocks along the former Neotethys arc.

Adakite

Underplating

Porphyritic

Volcanic arc

Primitive mantle

10.1016/j.lithos.2024.107737

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