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首页> 外文会议>International Conference on Environmental and Geological Science and Engineering >Geochemical characteristics of oceanic plagiogranite and basic dikes at the sheeted dike complex of Central Anatolian Ophiolites at Bozkir (Ortakoy-Aksaray/TURKEY) Dam
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Geochemical characteristics of oceanic plagiogranite and basic dikes at the sheeted dike complex of Central Anatolian Ophiolites at Bozkir (Ortakoy-Aksaray/TURKEY) Dam

机译：Bozkir（Ortakoy-Aksaray /土耳其）大坝中央阿纳托利亚眼岩片堤米岩岩石岩石岩石岩石岩石岩的地球化学特征

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At Bozkir dam exposure, a well-developed sheeted dike complex contains basic rocks and plagiogranite associations showing dike-in-dike structure. In felsic rocks, green tschermakite and brown biotite are two major mafic minerals, with plagioclase showing albite twinning and slight normal zoning. The major rock forming minerals in the basic rocks are hornblende, plagioclase (An% 83), diopside and occasionally biotite in a poikilitik texture. The plagiogranite samples are rich in SiO_2 (74.5-80.05 wt%), Na_2O (3.63-4.51wt%) and poor in K_2O (mostly 0.03-0.36) while the basic dike samples are enriched in Fe_2O_3t (mostly 6.2-8.9 wt%), and depleted in SiO_2 (mostly 46.45-50.5 wt%). Tholeiitic felsic and basic rocks are mostly tonalite and gabbro in composition, respectively. The occurrence of plagiogranites as leucozomes in the basic rocks suggests that the plagiogranites in the complex may have formed by low-pressure melting of hydrated oceanic gabbro. This may be confirmed by existence of compositional gaps in some variation diagrams, e.g. Al_2O_3, TiO_2 and Ba versus SiO_2. Most of the samples are characterized by concave-upward REE pattern with positive Eu anomaly, confirming hornblende rich source, with distinct but variable Eu anomaly. Existence of negative Eu (Eu/Eu~*:0.12) anomaly in the REE pattern of the plagiogranite, and that of negative correlation CaO and Na_2O with SiO_2 in the Harker diagram proposes that fractional crystallization of plagioclase was also significant in petrological history of the samples. Geochemical characteristics showed 3 groups of plagiogranites, possibly reflecting variable degrees of partial melting. Both the gabbro and plagigranites have high LILE/HFSE ratios, with negative Ti anomalies, typical for subduction zone-related settings.
机译：在博兹克尔坝曝光，一个发达的席状岩脉复杂的包含基性岩和斜长花岗岩协会表示堤在堤结构。在酸性岩，绿色tschermakite和棕色黑云母两个主要的镁铁矿物，斜长石与钠长石展示孪生和轻微的正常分区。主要造岩矿物中基性岩是角闪石，斜长石（一种83％），透辉石和黑云母偶尔在poikilitik质感。的斜长样品富含SiO_2（74.5-80.05重量％），Na_2O（3.63-4.51wt％），差K_2O（主要是0.03-0.36），而基本堤样品在Fe_2O_3t（主要是6.2-8.9重量％）富集，并在SiO_2（主要是46.45-50.5重量％）耗尽。拉斑的长英质和基性岩大多是英云和辉长岩组成，分别。斜长如在基性岩leucozomes的发生表明，在复合物中的斜长可通过水合海洋辉长岩的低压熔化已经形成。这可以通过组成间隙的存在在一些变化图，例如可以确认Al_2O_3的，的TiO_2和Ba与SiO_2。大多数样品都与Eu正特征在于凹向上REE图案异常，确认角闪石来源丰富，具有鲜明的而是可变Eu异常。 Eu负（EU /铕〜*：0.12）的存在异常的斜长的REE图案，以及负相关CaO和Na_2O与SiO_2在哈克图的提出，斜长石的分级结晶也是在的岩石学历史显著样本。地球化学特征表明3组斜长的，这可能反映不同程度的部分熔融的。无论是辉长岩和plagigranites具有高LILE / HFSE比例，负的Ti异常，典型的俯冲带相关的设置。

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