University of Isfahan Petrological Journal 2228-5210 9 4 2019 02 20 Geochemistry and Isotope Geology of Adakitic Domes from ‎Chakane Area in South of Quchan (Northeast of Iran)‎ Geochemistry and Isotope Geology of Adakitic Domes from ‎Chakane Area in South of Quchan (Northeast of Iran)‎ 25 48 22973 10.22108/ijp.2018.104209.1031 FA Mehdi Rezaei-Kahkhaei Department of Petrology and Economic Geology, Faculty of Earth Sciences, Shahrood University of Technology Ayoub Taheri Department of Petrology and Economic Geology, Faculty of Earth Sciences, Shahrood University of Technology Habibollah Ghasemi شاهرود- بلوار دانشگاه- دانشگاه صنعتی شاهرود- دانشکده علوم زمین 0000-0001-5446-9961 Sara Gardideh Department of Petrology and Economic Geology, Faculty of Earth Sciences, Shahrood University of Technology Journal Article 2017 05 20 The Chekneh subvolcanic domes with dacite and trachydacite compositions from the Miocene is located  110 km NE of Sabzevar, and are parts of the North Sabzevar-South Ghochan magmatic belt. The dome rocks have porphyry, sieve, trachytic and glomeroporphyritic textures, consisting of plagioclase and amphibole. Primitive mantle normalized spider diagram and chondrite-normalized REE patterns of the study domes suggest that they are enriched in LREE and LILE and are depleted in HREE and HFSE. They are calc-alkaline with significant negative HFSE (e.g., P, Nb and Ti) anomalies and (La/Yb)N>12 which are characteristics of magmas formed in active continental margin. Based on SiO₂, high Sr/Y, low K₂O/Na₂O and low Y, Yb, Cr and Mg^# contents, the study rocks are similar to high-silica adakites (HSA). Thus, it seems that the parent magma of the study domes was originated from amphibole eclogite or garnet amphibolite rocks of metamorphosed Neotethys oceanic lithosphere during its subduction beneath the southern part of eastern Alborz in the Miocene. The initial ⁸⁷Sr/⁸⁶Sr (0.7039-0.7043) and ɛNd_10Ma (2.9-4.98) of the Chekaneh domes is similar to MORB composition, which are coincided with those adakites originated from the partial melting of the Cenozoic oceanic lithosphere. The Chekneh subvolcanic domes with dacite and trachydacite compositions from the Miocene is located  110 km NE of Sabzevar, and are parts of the North Sabzevar-South Ghochan magmatic belt. The dome rocks have porphyry, sieve, trachytic and glomeroporphyritic textures, consisting of plagioclase and amphibole. Primitive mantle normalized spider diagram and chondrite-normalized REE patterns of the study domes suggest that they are enriched in LREE and LILE and are depleted in HREE and HFSE. They are calc-alkaline with significant negative HFSE (e.g., P, Nb and Ti) anomalies and (La/Yb)N>12 which are characteristics of magmas formed in active continental margin. Based on SiO₂, high Sr/Y, low K₂O/Na₂O and low Y, Yb, Cr and Mg^# contents, the study rocks are similar to high-silica adakites (HSA). Thus, it seems that the parent magma of the study domes was originated from amphibole eclogite or garnet amphibolite rocks of metamorphosed Neotethys oceanic lithosphere during its subduction beneath the southern part of eastern Alborz in the Miocene. The initial ⁸⁷Sr/⁸⁶Sr (0.7039-0.7043) and ɛNd_10Ma (2.9-4.98) of the Chekaneh domes is similar to MORB composition, which are coincided with those adakites originated from the partial melting of the Cenozoic oceanic lithosphere. https://ijp.ui.ac.ir/article_22973_5dd3b00123fb55d561f685e79c38d5c7.pdf