Please use this identifier to cite or link to this item:
Title: Geochronology, geochemistry and petrology of the Oligocene magmatism in SE segment of the UDMB, Iran
Author: Moghadam, Hadi Shafaii
Griffin, William L.
Santos, José F.
Chen, Ren-Xu
Karsli, Orhan
Lucci, Federico
Sepidbar, Fatemeh
O'Reilly S.Y
Keywords: Arc magmatism
Zircon U-Pb ages
Urumieh-Dokhtar Magmatic Belt
Issue Date: May-2022
Publisher: Elsevier
Abstract: Despite diverse geochronological-geochemical studies on Cenozoic igneous rocks from the SE segment of the Urumieh-Dokhtar Magmatic Belt (UDMB) of Iran, the nature of the Oligocene magmatic rocks from the farthermost end of the SE segment- where it is linked to the Makran magmatic belt- has been ignored due to the difficulty of access. In this study, we focus on syn-collisional mafic to felsic igneous rocks of calc-alkaline and high-K calc-alkaline affinities from the SE segment of the Urumieh-Dokhtar Magmatic Belt (UDMB) near Nagisun, south of Bam. The Nagisun rocks have low Sr/Y and La(n)/Yb(n), similar to igneous rocks from typical arcs. Zircon Usingle bondPb ages show comparable ages for plutonic (~ 34–25 Ma) and volcanic (~34–27 Ma) rocks. The εHf(t) values for zircons from plutonic rocks range from −0.3 to +12.8, whereas the εHf(t) values for the volcanic rocks vary from −2.6 to +13. Modelling of trace elements compositions using Nagisan basaltic samples indicate that an 87:2:11 mixture of the depleted MORB mantle, subducting (trench)-sediments and altered oceanic crust with 5% aggregated fractional melting closely matches the trace-element abundances of the Nagisun basaltic rocks. Indeed, the modelling of Sr and Nd isotopic data emphasizes that the Nagisun magmatic rocks could be products of bulk mixing between a depleted MORB mantle and/or a mixed, fertilized mantle with the Cadomian lower and upper continental crust. Furthermore, our compiled data display that the magmatism in the SE segment of the UDMB changed through time from normal calc-alkaline magmatism to adakitic magmatism at ~20 Ma, after the collision with Arabia began ca 27 Ma.
Peer review: yes
DOI: 10.1016/j.lithos.2022.106644
ISSN: 0024-4937
Publisher Version:
Appears in Collections:DGeo - Artigos
GeoBioTec - Artigos

Files in This Item:
File Description SizeFormat 
ShafaiiMoghadametal2022 - Lithos.pdf1.21 MBAdobe PDFrestrictedAccess

Formato BibTex MendeleyEndnote Degois 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.