Petrogenesis of the late Miocene Chenar volcanism in the southeast Urumieh-Dokhtar magmatic belt, Kerman, Iran : evidence from geochemical, U-Pb geochronologic, and Hf isotopic constraints: Petrogenesis and geochronologic of the Chenar volcanism (Iran)
Salehi Nejard, Hamideh (Shahid Bahonar University of Kerman. Department of Geology)
Shahosinie, Elham (Islamic Azad University. North Tehran Branc. Department of Geology)
Nazarinia, Asma (University of Hormozgan. Department of Geology)
Lentz, David R. (University of New Brunswick. Department of Earth Sciences)

Additional title:	Petrogenesis of the late Miocene Chenar volcanism in the southeast Urumieh-Dokhtar magmatic belt, Kerman, Iran : evidence from geochemical, U-Pb geochronologic, and Hf isotopic constraints
Date:	2024
Abstract:	The Chenar volcanic cone intruded the southeastern part of the Dehaj-Sarduiyeh volcano-sedimentary belt, in the southeast Urumieh-Dokhtar magmatic arc in Iran. The adakitic rocks, with porphyritic texture, mainly consist of rhyodacites and dacites,commonly comprised of phenocrysts of plagioclase, hornblende and biotite, with rare K-feldspar in a groundmass composed of plagioclase, K-feldspar and quartz. They yielded U-Pb zircon ages of 5. 52±0. 099Ma, 5. 46±0. 12Ma, and 6. 44±0. 12Ma, and radiogenic ɛHf(t) values ranging from +3. 1 to +12. 7. The whole-rock geochemical analysis of these rocks reveals transitional calc-alkaline to shoshonitic characteristics. The geochemical characteristics of the study rocks, particularly their high Sr/Y (⁓51. 6-136. 8) at low Y (⁓4. 43-16. 2ppm) and high La/Yb (⁓28. 4-118. 4ppm) at low Yb (⁓0. 2-1. 3ppm), are coherent with a high silica adakitic signature. The whole-rock positive Eu/Eu* anomaly and zircon Ce/Ce* anomaly reflect the effects of an oxidized magmatic signature where the rocks of the study area originated from a mantle source. The high silica adakite geochemical characteristics of the Chenar volcanic cone support formation by partial melting of the modified mantle under the influence of metasomatized subducted oceanic slab in a post-collisional environment.
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Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Urumieh-dokhtar magmatic arc ; Dehaj-sarduiyeh volcano-sedimentary belt ; Hf isotopes ; U-pb dating ; Adakite ; Iran
Published in:	Geologica acta, Vol. 22 (2024) , p. 1-23, I-IV (Articles) , ISSN 1696-5728

Adreça original: https://revistes.ub.edu/index.php/GEOACTA/article/view/42777
DOI: 10.1344/GeologicaActa2024.22.1

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