{"title":"PETROLOGICAL STUDY OF PLAGIOGRANITES IN THE NAIN OPHIOLITE (CENTRAL IRAN)","authors":"Zahra Rezaei, M. Noghreyan, M. Khalili","doi":"10.4454/OFIOLITI.V37I2.408","DOIUrl":null,"url":null,"abstract":"The plagiogranites from the Nain ophiolite consist of plagioclase (albite to andesine), quartz, amphibole (mostly magnesio-hornblende), apatite, titanite and oxide phases. These rocks have low K 2 O, Sr and high Y contents, with low Sr/Y ratios; they are geochemically similar to volcanic arc granites. The chondrite normalized REE patterns of the selected samples are characterized by negative Eu anomalies. We propose that the Nain plagiogranites formed by fractional crystallization of a low-K tholeiitic magma in a supra-subduction setting.","PeriodicalId":54690,"journal":{"name":"Ofioliti","volume":"37 1","pages":"93-99"},"PeriodicalIF":1.2000,"publicationDate":"2012-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ofioliti","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.4454/OFIOLITI.V37I2.408","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOLOGY","Score":null,"Total":0}
引用次数: 3
Abstract
The plagiogranites from the Nain ophiolite consist of plagioclase (albite to andesine), quartz, amphibole (mostly magnesio-hornblende), apatite, titanite and oxide phases. These rocks have low K 2 O, Sr and high Y contents, with low Sr/Y ratios; they are geochemically similar to volcanic arc granites. The chondrite normalized REE patterns of the selected samples are characterized by negative Eu anomalies. We propose that the Nain plagiogranites formed by fractional crystallization of a low-K tholeiitic magma in a supra-subduction setting.
期刊介绍：
Since 1976, Ofioliti provides an international forum for original contributions and reviews in the field of the geodynamics, petrology, geochemistry, biostratigraphy, stratigraphy, tectonics and paleogeography applied to ophiolitic terrains and modern oceanic lithosphere, including their sedimentary cover. Studies of topics such as geodynamics of the mantle, the evolution of orogens including ophiolites and paleoceanography are also welcome
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