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首页> 外文期刊>Journal of Asian earth sciences >U-Pb geochronology, bulk-rock geochemistry and petrology of Late Cretaceous syenitic plutons in the Goelkoey (Ordu) area (NE Turkey): Implications for magma generation in a continental arc extension triggered by slab roll-back
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U-Pb geochronology, bulk-rock geochemistry and petrology of Late Cretaceous syenitic plutons in the Goelkoey (Ordu) area (NE Turkey): Implications for magma generation in a continental arc extension triggered by slab roll-back

机译：Goelkoey（Ordu）地区（东北土耳其）的晚白垩纪蛇纹岩类铀矿的U-Pb地质年代学，块岩地球化学和岩石学：平板回滚触发大陆弧延伸产生岩浆的意义

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Late Cretaceous felsic plutons in the Eastern Pontides orogenic belt of Turkey are found in varying ages, sizes and compositions. The Late Cretaceous syenitic bodies, namely Direkli and Yenikoy Tepe plutons in the Ordu area, intruded into the Late Cretaceous volcanics and volcanoclastics, and compositionally consist of syenite and minor quartz-syenite with mainly granular and rarely porphyric, poikilitic and perthitic textures. The studied plutons contain K-feldspar, plagioclase, quartz, clinopyroxene, biotite and minor hornblende, and Fe-Ti oxide, apatite, and zircon. Mineral thermobarometer estimations imply that the syenitic plutons were crystallized in P-T conditions representing mid to shallow crustal levels. Petrochemically, these syenitic plutons show I-type, metaluminous-peraluminous transitional (A/CNK = 0.85-1.04) and shoshonitic features. LA-ICP-MS U-Pb zircon dating on the syenitic plutons yielded weighted mean ages of 78.5-72 Ma. Primitive mantle-normalized trace element patterns of the studied plutons are characterized by negative anomalies of Ba, Sr, Nb, Ta and Ti, and enrichment in Rb, Th, K, Ce and La. The chondrite-normalized rare earth element (REE) plots of the studied plutons show moderately enriched concave-shaped patterns (La-N/Lu-N = 10.3-10.7 for the Direkli pluton; La-N/Lu-N = 6.8-11.7 for the Yenikoy Tepe pluton) with negative Eu anomalies. The plutons have Sr-87/Sr-86 ratios (0.705368-0.706954), Nd-143/Nd-144 ratios (0.512600-0.512672), Pb-206/Pb-204 ratios (19.29-19.52) and Pb-207/Pb-204 ratios (15.65-15.67). The geochemical data, as well as regional geology, suggest that the Late Cretaceous syenitic plutons have formed in an extensional continental arc setting triggered by slab roll-back. The parental magma of syenitic plutons was derived from melts of lower crustal materials (metabasalt/metaandesite) and lithospheric mantle component.
机译：在土耳其东部庞蒂德斯造山带中发现晚白垩世的长英质海藻，其年龄，大小和组成各不相同。晚白垩世的共生体，即Ordu地区的Direkli和Yenikoy Tepe岩体侵入到晚白垩世的火山岩和火山碎屑岩中，组成上由正长岩和次要石英正长岩组成，主要为粒状，很少有斑状，钾长石和蠕生质。被研究的云母含有钾长石，斜长石，石英，斜辉石，黑云母和小角闪石，以及铁钛氧化物，磷灰石和锆石。矿物温度晴雨表估计表明，在代表中至浅地壳水平的P-T条件下，共生体晶系结晶。在石油化学方面，这些亚硒化lut显示出I型，金属-铝-过渡态（A / CNK = 0.85-1.04）和肖尼奇特征。 LA-ICP-MS U-Pb锆石在共生体聚体上的年代，加权平均年龄为78.5-72 Ma。所研究的云母的原始地幔归一化痕量元素特征为Ba，Sr，Nb，Ta和Ti的负异常，以及Rb，Th，K，Ce和La的富集。球粒陨石归一化稀土元素（REE）所研究的子体的图显示了中等富集的凹形图案（Direkli子体的La-N / Lu-N = 10.3-10.7； Yenikoy Tepe子体的La-N / Lu-N = 6.8-11.7），负Eu异常。轻子具有Sr-87 / Sr-86比（0.705368-0.706954），Nd-143 / Nd-144比（0.512600-0.512672），Pb-206 / Pb-204比（19.29-19.52）和Pb-207 / Pb -204的比率（15.65-15.67）。地球化学数据以及区域地质学表明，晚白垩世的共生体聚积岩是在板块回滚触发的伸展大陆弧环境中形成的。蛇纹岩类母体的母岩浆来自下地壳物质（玄武岩/变色云母）和岩石圈地幔组分的熔体。

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