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)
DOI:
https://doi.org/10.1344/GeologicaActa2024.22.1Keywords:
Urumieh-Dokhtar magmatic arc, Dehaj-Sarduiyeh volcano-sedimentary belt, Hf isotopes, U-Pb dating, Adakite, IranAbstract
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.
Resumen
El cono volcánico de Chenar intruyó la parte sudoriental del cinturón volcano-sedimentario de Dehaj-Sarduiyeh, en el arco magmático sudoriental de Urumieh-Dokhtar, en Irán. Las rocas adacíticas, con textura porfídica, consisten principalmente en riodacitas y dacitas, comúnmente compuestas por fenocristales de plagioclasa, hornblenda y biotita, con poco feldespato K, en una masa de fondo compuesta por plagioclasa, feldespato K y cuarzo. Se obtuvieron edades de circón U-Pb de 5,52±0,099Ma, 5,46±0,12Ma, y 6,44±0,12Ma, y valores radiogénicos de ɛHf(t) que oscilan entre +3,1 y +12,7. El análisis geoquímico de toda la roca revela características transicionales de calcoalcalinas a shoshoníticas.
Las características geoquímicas de las rocas estudiadas, particularmente su alto Sr/Y (⁓51.6-136.8) a bajo Y (⁓4.43-16.2ppm) y alto La/Yb (⁓28.4-118.4ppm) a bajo Yb (⁓0.2-1.3ppm), son coherentes con una firma adacítica de alto contenido en sílice. La anomalía positiva Eu/Eu* en toda la roca y la anomalía Ce/Ce* en el circón reflejan los efectos de una señal magmática oxidada, con las rocas de la zona de estudio procedentes de una fuente del manto. Las características geoquímicas de la adakita con alto contenido en sílice del cono volcánico de Chenar apoyan la formación por fusión parcial del manto modificado bajo la influencia de la losa oceánica subducida metasomatizada en un entorno post-colisional.
Palabras clave: arco magmático Urumieh-Dokhtar, cinturón volcano-sedimentario Dehaj-Sarduiyeh, isótopos de Hf, datación por U-Pb, Adakita, Irán.
Resum
El con volcànic Chenar va intruïr a la part sud-est del cinturó volcànic-sedimentari Dehaj-Sarduiyeh, a l'arc magmàtic sud-est d'Urumieh-Dokhtar a l'Iran. Les roques adaquítiques, de textura porfírítica, són principalment riodacites i dacites, comunament formades per fenocristalls de plagiòclasi, hornblenda i biotita, amb poc K-feldspat, en una massa de fons composta per plagiòclasi, K-feldspat i quars. Es van obtenir valors d’edats de zircó U-Pb de 5,52±0,099Ma, 5,46±0,12Ma i 6,44±0,12Ma i valors radiogènics de ɛHf(t) que van des de +3,1 fins a +12,7. L'anàlisi geoquímica de roca sencera revela característiques de transició de calc-alcalines a shoshonítiques.
Les característiques geoquímiques de les roques d'estudi, especialment el seu elevat Sr/Y (⁓51,6-136,8) a baix Y (⁓4,43-16,2 ppm) i alt La/Yb (⁓28,4-118,4 ppm) a baix Yb (⁓0,2-1,3). ppm), són coherents amb una signatura adakítica d'alta sílice. L'anomalia Eu/Eu* positiva de tota la roca i l'anomalia del zircó Ce/Ce* reflecteixen els efectes d'una signatura magmàtica oxidada, amb les roques de l'àrea d'estudi originàries d'una font del mantell. Les característiques geoquímiques d'adakita d'alta sílice del con volcànic de Chenar donen suport a la formació mitjançant la fusió parcial del mantell modificat sota la influència de la llosa oceànica subduïda metasomatitzada en un entorn posterior a la col·lisió.
Paraules clau: arc magmàtic d'Urumieh-Dokhtar, cinturó volcànic-sedimentari de Dehaj-Sarduiyeh, isòtops Hf, datació U-Pb, adakita, Iran.
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