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

Content Provider	Springer Nature Link
Author	Nakhaei, M. Mazaheri, S. A. Karimpour, M. H. Stern, C. R. Zarrinkoub, M. H. Mohammadi, S. S. Heydarian shahri, M. R.
Copyright Year	2015
Abstract	There are several intermediate (SiO$_{2}$ = 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 $^{87}$Sr/$^{86}$Sr ratios is 0.70642 and initial ε $_{Nd}$ 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.
Starting Page	8481
Ending Page	8495
Page Count	15
File Format	PDF
ISSN	18667511
Journal	Arabian Journal of Geosciences
Volume Number	8
Issue Number	10
e-ISSN	18667538
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-03-06
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Birjand Iran Diorite porphyry $^{87}$Sr/$^{86}$Sr ratio Zr-U-Pb age dating Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science

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