伊朗中部蛇绿岩中斜长花岗岩的岩石学研究

IF 1.2 4区地球科学 Q2 GEOLOGY

Ofioliti Pub Date : 2012-12-27 DOI:10.4454/OFIOLITI.V37I2.408

Zahra Rezaei, M. Noghreyan, M. Khalili

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引用次数: 3

摘要

纳因蛇绿岩中的斜长花岗岩主要由斜长石(钠长石到安山石)、石英、角闪石(主要为镁角闪石)、磷灰石、钛矿和氧化物相组成。这些岩石的k2o、Sr含量低，Y含量高，Sr/Y比值低;它们在地球化学上与火山弧花岗岩相似。所选样品的球粒陨石归一化稀土模式以负Eu异常为特征。我们认为南斜花岗岩体是由低钾拉斑岩浆在超俯冲环境中分离结晶形成的。

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PETROLOGICAL STUDY OF PLAGIOGRANITES IN THE NAIN OPHIOLITE (CENTRAL IRAN)

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.

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来源期刊

Ofioliti 地学-地质学

CiteScore

2.40

自引率

7.70%

发文量

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