Earth-Science Reviews, Volume (226), No (226), Year (2022-3) , Pages (103930-103930)

Title : ( Temporal changes in subduction- to collision-related magmatism in the Neotethyan orogen: The Southeast Iran example )

Authors: Hadi Shafee Moghaddam , Qiu LiLi , Willian L Griffin , Robert J Stern , Josef F. Santos , Mihai n. Doucea , Chris J Ottley , Orhan Karsli , Fatemeh Sepidbar , Suzzan Y O reilly ,

Access to full-text not allowed by authors

Citation: BibTeX | EndNote

Abstract

Continental-arc igneous rock compositions change in response to the transition from subduction to collision and these changes can reveal how the crust, lithosphere and magma sources evolved. Neotethys-related Late Cretaceous to Pleistocene subduction- and collision-related magmatic rocks from the ~350 km long southeast Urumieh-Dokhtar Magmatic Belt (UDMB) of Iran provide an excellent natural laboratory to better understand these changes. These igneous rocks are well-exposed and moderately eroded to reveal a nearly complete record since subduction initiation at ~95 Ma. We analyzed new samples for major and trace elements (83 samples), Sr–Nd isotopic compositions (47 samples), and U–Pb zircon ages (26 samples) and compiled geochemical and geochronological data on the southeast segment of the UDMB. The geochronological data reveal two magmatic pulses at ~80–70 Ma and ~50–0 Ma. Important changes in magmatic compositions reflect initial collision with Arabia at ~32 Ma, changing from normal calc-alkaline to increasingly adakitic immediately after collision began. Five stages can be identified: 1) normal continental-arc magmatism during the Late Cretaceous; 2) arc quiescence in Paleocene and Early Eocene time; 3) Middle-Late Eocene extensional arc magmatism related to slab rollback;4) early collision and crustal thickening during the Early Oligocene; and 5) slab breakoff, asthenospheric upwelling, and associated adakitic magmatism from Middle Miocene onward. Temporal changes in UDMB magmasreflect the response of the overriding plate to changes in the geometry of the subducting Neotethyan lithosphere and to collision between Arabia and Iran. Crustal thickening and arc narrowing during Miocene to Pleistocene post-collisional magmatism caused adakitic magmatism and associated Cu mineralization. Zircon O–Hf and apatite O isotopes as well as bulk-rock Nd isotopes of Cu-bearing adakitic rocks are similar to other barren rocks, but nearly all fertile rocks have higher Hf/Y, Eu/Eu*(n) in zircon and higher Sr/Y, V/Y, Eu/Eu*(n) in apatite than barren rocks

Keywords

, Continental arc Continental collision Adakite Urumieh, Dokhtar Magmatic Belt Iran
برای دانلود از شناسه و رمز عبور پرتال پویا استفاده کنید.

@article{paperid:1099556,
author = {هادی شفیعی مقدم and Qiu LiLi and Willian L Griffin and Robert J Stern and Josef F. Santos and Mihai N. Doucea and Chris J Ottley and Orhan Karsli and Fatemeh Sepidbar, and Suzzan Y O Reilly},
title = {Temporal changes in subduction- to collision-related magmatism in the Neotethyan orogen: The Southeast Iran example},
journal = {Earth-Science Reviews},
year = {2022},
volume = {226},
number = {226},
month = {March},
issn = {0012-8252},
pages = {103930--103930},
numpages = {0},
keywords = {Continental arc Continental collision Adakite Urumieh-Dokhtar Magmatic Belt Iran},
}

[Download]

%0 Journal Article
%T Temporal changes in subduction- to collision-related magmatism in the Neotethyan orogen: The Southeast Iran example
%A هادی شفیعی مقدم
%A Qiu LiLi
%A Willian L Griffin
%A Robert J Stern
%A Josef F. Santos
%A Mihai N. Doucea
%A Chris J Ottley
%A Orhan Karsli
%A Fatemeh Sepidbar,
%A Suzzan Y O Reilly
%J Earth-Science Reviews
%@ 0012-8252
%D 2022

[Download]