Age and nature of 560–520 Ma calc-alkaline granitoids of Biarjmand, northeast Iran: insights into Cadomian arc magmatism in northern Gondwana
作者： Hadi S. Moghadam , Xian–Hua Li , Robert J. Stern , Jose F. Santos , Ghasem Ghorbani
DOI: 10.1080/00206814.2016.1166461
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摘要: ABSTRACTThe Biarjmand granitoids and granitic gneisses in northeast Iran are part of the Torud–Biarjmand metamorphic complex, where previous zircon U–Pb geochronology show ages ca. 554–530 Ma for orthogneissic rocks. Our new confirm a Cadomian age that gneiss is ~30 million years older (561.3 ± 4.7 Ma) than intruding (522.3 ± 4.2 Ma; 537.7 ± 4.7 Ma). magmatism was an approximately 100-million-year-long episode subduction-related arc back-arc magmatism, which dominated whole northern Gondwana margin, from Iberia to Turkey Iran. Major REE trace element data these have calc-alkaline signatures. Their O (δ18O = 6.2–8.9‰) Hf (–7.9 +5.5; one point with eHf ~ –17.4) as well bulk rock Nd isotopes (eNd(t) = –3 –6.2) magmas were generated via mixing juvenile crust and/or melting middle continental crust. Whole-rock model...
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