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首页> 外文期刊>Geodinamica Acta >U-Pb zircon geochronology of northern metamorphic massifs in the Biga Peninsula (NW Anatolia-Turkey): new data and a new approach to understand the tectonostratigraphy of the region
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U-Pb zircon geochronology of northern metamorphic massifs in the Biga Peninsula (NW Anatolia-Turkey): new data and a new approach to understand the tectonostratigraphy of the region

机译：大加半岛北部变质地块的U-Pb锆石年代学（西北安纳托利亚-土耳其）：了解该地区构造地层的新数据和新方法

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Metamorphic massifs of the Biga Peninsula can be divided into two approximately ENE–WSW-trending belts. It is believed that these two belts represent two different tectonic zones separated by a NE-trending Alpine ophiolitic suture. The Sakarya Zone lies to the S–SE of this Alpine suture, and consists of the Kazda? metamorphic complex which is tectonically overlain by the Permo-Triassic Karakaya Complex. The metamorphic rocks, as an Alpine edifice located N–NW of the suture, have been assigned to the Rhodope and Serbo-Macedonian massifs of Bulgaria and Greece. The northern metamorphic belt is represented by the Karada? Massif in the west, which has been evaluated as a different unit from the others, the Karabiga Massif in the east and the ?aml?ca Massif between them. All three massifs are mapped in detail in light of previous studies and LA–ICP–MS U-Pb zircon dating was applied to stratigraphically compare them. Contrary to previous studies, our data indicate that the basement metamorphic associations in these three areas show similar characteristics concerning their stratigraphical and lithological aspects and also spatial distribution of their outcrops. U-Pb LA–ICP–MS dating of zircons from the three individual metamorphic massifs yielded the following data: maximum sedimentation ages of the protolith of mica schists in the range of 559 ± 17 to 582 ± 30 Ma; crystallisation age of the protolith of metavolcanic rocks of 577 ± 20 Ma; and crystallisation age of the protolith of eclogites at 565 ± 9 Ma. These ages clearly show that the metamorphic units of the northern massifs are comparable to each other. Also, the U-Pb zircon concordia diagrams from these three metamorphic massifs show remarkably similar patterns. In addition to the similar maximum sedimentation ages for all mica schists with crystallisation ages of the protoliths of the metabasic rocks, there are two major complex tectono-thermal overprints (episodic lead loss events), at c. 330–300 Ma (Variscan?) and c. 100–10 Ma (Alpine and late Alpine?), respectively. Field mapping and analytical data indicate that the basement rocks of the northern massifs in the Biga Peninsula have a correlative Late Ediacaran to Early Cambrian stratigraphic range. In part, Permian strata unconformably overlie basement rocks in the Karada? Massif. Both tectono-thermal events are demonstrated by coeval episodic lead loss of many zircons in all samples from all areas. Finally, the results of this research do not support an Alpine suture between the two metamorphic belts of the Biga Peninsula. Therefore, the geological evolution of the region might require reevaluation.
机译：Biga半岛的变质地块可分为大约ENE-WSW趋势带。可以认为，这两个带代表了由NE趋势高山蛇纹岩缝线隔开的两个不同的构造带。萨卡里亚（Sakarya）区位于该高山缝线的S–SE处，由Kazda？变质复合物，在构造上被Permo-Triassic卡拉卡亚复合物覆盖。属于缝线N–NW的高山构造的变质岩已分配给保加利亚和希腊的罗多彼州和塞尔维亚－马其顿地块。北部变质带以卡拉达为代表？西部的Massif被评估为与其他山脉不同的单位，东部的Karabiga山脉和它们之间的Aml？ca山脉。根据先前的研究对所有三个地块进行了详细的测绘，并使用LA–ICP–MS U-Pb锆石定年法对其进行了地层比较。与先前的研究相反，我们的数据表明这三个地区的基底变质联系在地层和岩性方面以及露头的空间分布方面显示出相似的特征。来自三个变质岩块的锆石的U-Pb LA-ICP-MS测年得到以下数据：云母片岩原生质体的最大沉积年龄为559±17至582±30 Ma;准火山岩原生质岩的结晶年龄为577±20Ma;榴辉岩原生质的结晶和结晶年龄为565±9 Ma。这些年龄清楚地表明，北部地块的变质单元彼此可比。而且，来自这三个变质块的U-Pb锆石共生图显示出非常相似的模式。除了所有的云母片岩的最大沉积年龄与次生代岩石的原石的结晶年龄相似外，在c处还存在两个主要的复杂构造热套印（周期性铅损失事件）。 330–300 Ma（Variscan？）和c。 100–10 Ma（高山和晚期高山？）。现场测绘和分析数据表明，比加半岛北部断层的基底岩石具有晚埃迪卡拉和早寒武纪地层范围。在一定程度上，二叠纪地层不整合地覆盖了卡拉达的基底岩层？断层块。这两个构造热事件都通过来自各个地区的所有样本中许多锆石的同时期铅的铅损失证明。最后，这项研究的结果不支持Biga半岛两个变质带之间的高山缝合线。因此，该地区的地质演化可能需要重新评估。

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