Arabian Journal of Geosciences, ( ISI ), Volume (8), No (10), Year (2015-10) , Pages (8481-8495)

Title : ( Geochronologic, geochemical, and isotopic constraints on petrogenesis of the dioritic rocks associated with Fe skarn in the Bisheh area, Eastern Iran )

Authors: malihe nakhaei , Seyed Ahmad Mazaheri , Mohammad Hassan Karimpour , C.R.Stern , M. H. Zarrinkoub , S. S. Mohammadi , Mohmmad Reza Heidarian Shahri ,

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Abstract There are several intermediate (SiO2=57.4–61.2 wt.%) subvolcanic bodies in the Bisheh area of eastern Iran. Petrochemical studies show that these bodies are calc-alkaline and metaluminous (A/NK≥1.68, A/CNK≤ 0.99) diorite porphyries. They are enriched in large-ion lithophile elements (LILE) and have negative anomalies of Nb, Ti, Ta, and P. Chondrite-normalized REE patterns exhibit light-rare-earth-elements (LREE) enrichment, with mildly fractionated REE patterns ((La/Yb)N<10). Their Nb/Yb versus Th/Yb ratios are similar to rocks formed in active continental margins. Their isotopic (initial 87Sr/86Sr ratios is 0.70642 and initial εNd values is −1.49) and other geochemical data suggest that the Bisheh diorite porphyries formed by melting of an enriched phlogopite-bearing mantle source combined with subsequent crustal contamination. High values of Rb, Ba, and Th support magma contamination in the upper crust during magma evolution. Zr-U-Pb age dating for two diorite porphyries yield middle Eocene (Bartonian) ages of 39.25±0.43 and 39.16± 0.41 Ma. These bodies have intruded into Paleocene limestone and caused metasomatism with iron oxide skarn formations.

Keywords

, Birjand, Iran, Diorite porphyry, 87Sr/86Sr ratio, Zr-U-Pb age
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@article{paperid:1052829,
author = {Nakhaei, Malihe and Mazaheri, Seyed Ahmad and Karimpour, Mohammad Hassan and C.R.Stern and M. H. Zarrinkoub and S. S. Mohammadi and Heidarian Shahri, Mohmmad Reza},
title = {Geochronologic, geochemical, and isotopic constraints on petrogenesis of the dioritic rocks associated with Fe skarn in the Bisheh area, Eastern Iran},
journal = {Arabian Journal of Geosciences},
year = {2015},
volume = {8},
number = {10},
month = {October},
issn = {1866-7511},
pages = {8481--8495},
numpages = {14},
keywords = {Birjand; Iran; Diorite porphyry; 87Sr/86Sr ratio; Zr-U-Pb age dating},
}

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%0 Journal Article
%T Geochronologic, geochemical, and isotopic constraints on petrogenesis of the dioritic rocks associated with Fe skarn in the Bisheh area, Eastern Iran
%A Nakhaei, Malihe
%A Mazaheri, Seyed Ahmad
%A Karimpour, Mohammad Hassan
%A C.R.Stern
%A M. H. Zarrinkoub
%A S. S. Mohammadi
%A Heidarian Shahri, Mohmmad Reza
%J Arabian Journal of Geosciences
%@ 1866-7511
%D 2015

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