{"title":"Almacık 复合体--安纳托利亚西北部的中下部地壳掘出区","authors":"A. Okay, A. Kylander-Clark, Sarah Sherlock","doi":"10.55730/1300-0985.1878","DOIUrl":null,"url":null,"abstract":": The Almacık Complex is a tectonic unit of high-grade metamorphic rocks in the Intra-Pontide Suture Zone in northwest Turkey. It consists mainly of amphibolite, metaultramafic rock, and gneiss, which are intruded by numerous pre-, syn-, and posttectonic felsic veins. The Almacık Complex is variously interpreted as a Cretaceous or Neoproterozoic ophiolite, or a Permian mafic-ultramafic complex representing the middle to lower crust of the Sakarya Zone. Herein, new petrological and geochronological data were presented from the Almacık Complex. Two-pyroxene geothermometry in the metawebsterites indicated that the Almacık Complex has undergone upper amphibolite-facies metamorphism at 750 ± 30 °C and 8 ± 4 kbar. U-Pb zircon and Ar-Ar ages from 11 samples indicate the presence of late Neoproterozoic, Permian, and Jurassic thermal events. Most of the Almacık Complex consists of late Neoproterozoic amphibolites and gneisses, representing the basement of the İstanbul Zone. This basement was intruded by voluminous mafic magma during the Late Permian. The basement and the Permian ultramafic-mafic rocks subsequently underwent upper amphibolite-facies metamorphism during the Jurassic, possibly at the base of a magmatic arc.","PeriodicalId":49411,"journal":{"name":"Turkish Journal of Earth Sciences","volume":null,"pages":null},"PeriodicalIF":1.3000,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Almacık Complex-an exhumed lower to middle crust in northwest Anatolia\",\"authors\":\"A. Okay, A. Kylander-Clark, Sarah Sherlock\",\"doi\":\"10.55730/1300-0985.1878\",\"DOIUrl\":null,\"url\":null,\"abstract\":\": The Almacık Complex is a tectonic unit of high-grade metamorphic rocks in the Intra-Pontide Suture Zone in northwest Turkey. It consists mainly of amphibolite, metaultramafic rock, and gneiss, which are intruded by numerous pre-, syn-, and posttectonic felsic veins. The Almacık Complex is variously interpreted as a Cretaceous or Neoproterozoic ophiolite, or a Permian mafic-ultramafic complex representing the middle to lower crust of the Sakarya Zone. Herein, new petrological and geochronological data were presented from the Almacık Complex. Two-pyroxene geothermometry in the metawebsterites indicated that the Almacık Complex has undergone upper amphibolite-facies metamorphism at 750 ± 30 °C and 8 ± 4 kbar. U-Pb zircon and Ar-Ar ages from 11 samples indicate the presence of late Neoproterozoic, Permian, and Jurassic thermal events. Most of the Almacık Complex consists of late Neoproterozoic amphibolites and gneisses, representing the basement of the İstanbul Zone. This basement was intruded by voluminous mafic magma during the Late Permian. The basement and the Permian ultramafic-mafic rocks subsequently underwent upper amphibolite-facies metamorphism during the Jurassic, possibly at the base of a magmatic arc.\",\"PeriodicalId\":49411,\"journal\":{\"name\":\"Turkish Journal of Earth Sciences\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.3000,\"publicationDate\":\"2023-11-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Turkish Journal of Earth Sciences\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.55730/1300-0985.1878\",\"RegionNum\":4,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Turkish Journal of Earth Sciences","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.55730/1300-0985.1878","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
:阿尔马茨克复合体是土耳其西北部内蓬莱断裂带上的一个高级变质岩构造单元。它主要由闪长岩、辉绿岩和片麻岩组成,并被许多构造前、同步和构造后长石脉所侵入。人们对阿尔马克复合岩有不同的解释,认为它是白垩纪或新新生代的蛇绿岩,或者是代表萨卡里亚区中下地壳的二叠纪黑云母-超黑云母复合岩。本文介绍了来自阿尔马溪克复合岩的新岩石学和地质年代数据。偏闪长岩中的双辉石测地温度表明,阿尔马溪克岩群在 750 ± 30 °C 和 8 ± 4 千巴的温度下经历了上闪长岩层变质作用。从11个样本中提取的U-Pb锆石和Ar-Ar年龄显示出新新生代晚期、二叠纪和侏罗纪热事件的存在。阿尔马克岩群的大部分由新新生代晚期的闪长岩和片麻岩组成,是伊斯坦布尔区的基底。二叠纪晚期,大量岩浆侵入了这一基底。基底和二叠纪超闪长岩-黑云母岩随后在侏罗纪期间经历了上闪长岩-变质作用,可能是在岩浆弧的底部。
Almacık Complex-an exhumed lower to middle crust in northwest Anatolia
: The Almacık Complex is a tectonic unit of high-grade metamorphic rocks in the Intra-Pontide Suture Zone in northwest Turkey. It consists mainly of amphibolite, metaultramafic rock, and gneiss, which are intruded by numerous pre-, syn-, and posttectonic felsic veins. The Almacık Complex is variously interpreted as a Cretaceous or Neoproterozoic ophiolite, or a Permian mafic-ultramafic complex representing the middle to lower crust of the Sakarya Zone. Herein, new petrological and geochronological data were presented from the Almacık Complex. Two-pyroxene geothermometry in the metawebsterites indicated that the Almacık Complex has undergone upper amphibolite-facies metamorphism at 750 ± 30 °C and 8 ± 4 kbar. U-Pb zircon and Ar-Ar ages from 11 samples indicate the presence of late Neoproterozoic, Permian, and Jurassic thermal events. Most of the Almacık Complex consists of late Neoproterozoic amphibolites and gneisses, representing the basement of the İstanbul Zone. This basement was intruded by voluminous mafic magma during the Late Permian. The basement and the Permian ultramafic-mafic rocks subsequently underwent upper amphibolite-facies metamorphism during the Jurassic, possibly at the base of a magmatic arc.
期刊介绍:
The Turkish Journal of Earth Sciences is published electronically 6 times a year by the Scientific and Technological Research
Council of Turkey (TÜBİTAK). It is an international English-language journal for the publication of significant original recent
research in a wide spectrum of topics in the earth sciences, such as geology, structural geology, tectonics, sedimentology,
geochemistry, geochronology, paleontology, igneous and metamorphic petrology, mineralogy, biostratigraphy, geophysics,
geomorphology, paleoecology and oceanography, and mineral deposits. Contribution is open to researchers of all nationalities.