Periodico di Mineralogia, Volume (88), No (1), Year (2019-4) , Pages (33-56)

Title : ( Geochronological and geochemical characteristics of the Dehzaman intrusive and volcanic rocks -NE Iran-: Implication for a Cadomian magmatism )

Authors: hossein hajimirzajan , Azadeh Malekzadeh Shafaroudi , Seyed Massoud Homam , Mohmmad Reza Heidarian Shahri , Jose Francisco Santos ,

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Abstract

Cadomian magmatism is interpreted to indicate fragments of late Neoproterozoic-early Cambrian continental arcs bordering the northern margin of Gondwana. Cadomian rocks constitute the main elements of the continental crust of central Iranian block -including the Lut block-. An example of such Cadomian rocks from NE Iran is studied here: the Dehzaman igneous rocks within the Kashmar- Kerman Tectonic Zone -KKTZ-. The Cadomian exposure in NE Iran includes intrusive rocks with a thick sequence of felsic volcanic rocks. Zircon U-Pb dating of syenogranites and ryholites yielded 238U/206Pb crystallization ages of ≈521.3 to ≈524.3 Ma, respectively and the age of 557 Ma to Biosyenogranites already was obtained by Rossetti et al. -2015- -Ediacaran-Early Cambrian-. Geochemically, the intrusive rocks are mostly characterized by high-K content and are similar to the I-type granites. These rocks are characterized by enrichment in large ion lithophile elements -LILEs- and light rare earth elements -LREEs- along with depletion in high field strength elements -HFSEs-. Their initial εNd -t- ranges from -0.6 to -2.1 at 86Sr/87Sr -i-=0.7045-0.7073. The Cadomian rocks from NE Iran, along with similaraged rocks from Turkey and Iran are suggested to form in an early stage of an active continental margin.

Keywords

, Cadomian magmatism; Zircon U, Pb ages; Active continental margin; Gondwana; Iran
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@article{paperid:1072820,
author = {Hajimirzajan, Hossein and Malekzadeh Shafaroudi, Azadeh and Homam, Seyed Massoud and Heidarian Shahri, Mohmmad Reza and Jose Francisco Santos},
title = {Geochronological and geochemical characteristics of the Dehzaman intrusive and volcanic rocks -NE Iran-: Implication for a Cadomian magmatism},
journal = {Periodico di Mineralogia},
year = {2019},
volume = {88},
number = {1},
month = {April},
issn = {0369-8963},
pages = {33--56},
numpages = {23},
keywords = {Cadomian magmatism; Zircon U-Pb ages; Active continental margin; Gondwana; Iran},
}

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%0 Journal Article
%T Geochronological and geochemical characteristics of the Dehzaman intrusive and volcanic rocks -NE Iran-: Implication for a Cadomian magmatism
%A Hajimirzajan, Hossein
%A Malekzadeh Shafaroudi, Azadeh
%A Homam, Seyed Massoud
%A Heidarian Shahri, Mohmmad Reza
%A Jose Francisco Santos
%J Periodico di Mineralogia
%@ 0369-8963
%D 2019

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