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首页> 外文期刊>Geodinamica Acta >Petrology and geochemistry of eclogites from the Biga Peninsula, Northwest Turkey
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Petrology and geochemistry of eclogites from the Biga Peninsula, Northwest Turkey

机译：土耳其西北部Biga半岛的榴辉岩的岩石学和地球化学

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The Biga Peninsula in northwest Turkey contains high-pressure metabasic eclogite that occur in two localities; as lenses within a 2 km long, 500 m thick quartz-phengite schist slice that is in turn found in the greenschist-facies metasedimentary rocks of the ?aml?ca metamorphics, in ?aml?ca area, and in two north-south elongated eclogites occurring as a tectonic slice between Kazda? Massif and ?etmi Group, in ?etmi area. The P-T conditions under which these two exposures of eclogites formed are important to quantify the tectonic processes of subduction, exhumation and emplacement that highpressure rocks of the Biga Peninsula record. New geochemical data suggest that both protoliths were N-type MORB basalt with high TiO_2 and K_2O–Na_2O content and Nb/Y ratios. Most eclogite samples have tholeiitic signatures volcanic arc settings. ΣREE abundances range from 47.55 to 107.4 ppm. Europium anomalies are slightly variable (Eu/Eu~* = 0.9–1.1) and trace element contents are similar to typical MORB based on tectonic discrimination diagrams. All eclogite protoliths were probably derived from depleted mantle source, modified by fluids within the subduction zone. The high-P mineral assemblage in eclogites from both regions is omphacite + garnet + glaucophane + phengite + epidote + zoisite + quartz. The inclusions in garnet are glaucophane, quartz, phengite, Ca-amphibole and rutile. P-T conditions are similar to each other and constrained at 550–700 °C and 16–24 kbar. Geochemical data and mineral chemistry indicate that the eclogites in the Biga Peninsula represent oceanic crust processed at significant depths (50–80 km) within the subduction channel and were juxtaposed with greenschist facies as a tectonic slice in the accretionary complex at higher structural levels.
机译：土耳其西北部的比加半岛（Biga Peninsula）含有高压变基榴辉岩，发生在两个地方。作为透镜，透镜位于长度为2 km，厚度为500 m的石英-石墨片岩片岩中，而该片岩又出现在aml？ca变质的绿片岩相沉积沉积岩中，？aml？ca地区以及两个南北拉长的岩石中卡兹达之间的构造切片中发生的榴辉岩？ Massif和？etmi集团，在？etmi地区。在这两次榴辉岩形成的P-T条件下，对量化Biga半岛高压岩石记录的俯冲，发掘和就位的构造过程很重要。新的地球化学数据表明，这两个原生石都是N型MORB玄武岩，具有较高的TiO_2和K_2O–Na_2O含量以及Nb / Y比。大多数的榴辉岩样品具有火山岩特征的火山岩特征。 ΣREE丰度范围为47.55至107.4 ppm。 t异常略有变化（Eu / Eu〜* = 0.9–1.1），微量元素含量与基于构造判别图的典型MORB相似。所有的榴辉岩原石可能都来自贫化的地幔源，并被俯冲带内的流体所修饰。这两个地区的榴辉岩中的高P矿物组合都是绿辉石+石榴石+葡甲藻土+锂铁矿+附子+锂沸石+石英。石榴石中的夹杂物为葡甲环烷，石英，锂铁矿，钙安瓿和金红石。 P-T条件彼此相似，并且受550-700°C和16-24 kbar限制。地球化学数据和矿物化学表明，大加半岛的榴辉岩代表俯冲通道内深处（50-80 km）深处加工的洋壳，并在较高构造水平上与绿片岩相并列为增生复合物中的构造片。

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