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首页> 外文期刊>Journal of Asian earth sciences >Distinct sources for high-K and adakitic magmatism in SE Iran
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Distinct sources for high-K and adakitic magmatism in SE Iran

机译：SE伊朗的高k和Adakitic Magmatism的独特来源

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Research into Arabia-Eurasia collision zone magmatism in Kerman Province, SE Iran, has largely focused on Late Cenozoic adakitic stocks or domes, with debate around lower crustal or subducted slab origins. Contemporary hawaiite-trachyandesite lava flows have been overlooked. New analyses for domes and lavas from near Dehaj show major and trace element distributions relating to two distinct compositional series. One contains medium-K domes with SiO2 60 wt%, high Sr/Y and La/Yb and generally low MgO, Ni and Cr, showing high-silica adakite affinity. The other series has high-K affinity and includes both lavas and dome samples. The two suites partially mixed in the shallow crust, confirmed by fieldwork and petrography. Isotopically the two suites are indistinguishable, implying a geologically young' age for the source of the adakites. Given its geochemical signatures and non-relationship with the more mafic, mantle-derived high-K series, we consider the adakite series to be derived from melting of eclogitized mafic lower crust. The high-K series relates to dehydration melting of mantle deeper within the similar to 220 km thick lithosphere. We also explore adakitic magmas across Iran and their relationship to porphyry copper deposits. At Dehaj and several other Iranian centres, adakites are chemically controlled by garnet as a source or fractionating phase, and are barren, whereas the presence of amphibole as a key phase seems to correlate with Cu mineralisation. This study also shows the need for evidence from multiple datasets to constrain adakite genesis and warns of avoiding sampling bias towards felsic lithologies.
机译：伊朗克尔曼省的阿拉伯 - 欧亚碰撞区岩狼在伊朗，主要集中在新生代的亚克萨克西股或圆顶上，争论下面的地壳或底层板块起源。现代风格夏威岩 - 龟头岩熔岩流动被忽视。来自Dehaj附近的圆顶和熔岩的新分析显示了与两个不同的组成系列有关的主要和微量元素分布。一种含有SiO 2> 60wt％，高Sr / Y和La / Yb的中k圆顶，通常低MgO，Ni和Cr，显示出高二氧化硅Adakite亲和力。另一个系列具有高k亲和力，包括熔岩和圆顶样本。两套套房在浅地壳中混合，通过野外工作和岩画证实。同位素，这两套套房是难以区分的，暗示了adakites的来源的地质年轻人的年龄。鉴于其地球化学签名和与更令人眼地性的MAFIC衍生的高k系列的非关系，我们认为Adakite系列源于Eclogitized MAFIC下外壳的熔化。高K系列涉及类似于220 km厚的岩石圈内更深的地幔脱水熔化。我们还探讨了伊朗的Adakitic Magmas及其与斑岩铜矿的关系。在Dehaj和其他几个伊朗中心，Adakites由Garnet化学控制为源或分馏阶段，并且贫瘠，而作为关键阶段的倒置的存在似乎与Cu矿化相关。本研究还表明需要来自多个数据集的证据来限制Adakite Genesis并警告避免对肠溶性的抽样偏差。

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