叶希洛瓦切克(梅尔辛)地区(土耳其南部,陶里德斯中部)侏罗纪下-中统地台碳酸盐岩层序的地层学和微地层分析

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of African Earth Sciences Pub Date : 2024-10-18 DOI:10.1016/j.jafrearsci.2024.105453
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引用次数: 0

摘要

本研究详细分析了图尔基耶南部阿纳托利德-陶里德碳酸盐地台南部(陶里德中部以南,叶西罗瓦茨克附近)侏罗系下-中统碳酸盐层序的地层、微地貌和沉积环境。该碳酸盐岩系由迪贝克利层和托克玛层以及构成托克玛层底部的伊谢克勒克兹特佩层组成。Dibekli地层(上新元古代-下巴约乾统)由灰岩组成,下部夹地层内砾岩,中下部为白云石,中上部为鲕粒灰岩。Işıklıkızıtepe岩层(上巴约契期)从含有褐红色铁结核的基底砾岩开始,由砂岩和砂质粘土灰岩交替组成。其上覆盖着薄石灰岩层,并向上延伸至托克玛层(上巴约卡统-巴托纳统)的厚层白云石。该地层的中上部由富含双壳类贝壳的砂质、鲕状石灰岩组成,上部以白云岩-石灰岩交替层结束。根据微观岩相分析和岩石生物含量,晚新元古代-普利斯巴赫期是一个低-中能量、受限内平台条件主导沉积环境的时期。构造内砾岩的出现表明这一时期不时有构造活动。在托阿克纪至最早的巴约克纪,低能量的潮间带和浅泻湖条件占据了沉积环境的主导地位,到了巴约克纪早期,沉积环境转变为高能量的沙洲和高于波基的环境。最早的晚巴约克世底部由棕红色、铁结核和铝土矿粒组成的基底砾岩表明,在晚巴约克世-巴吞纪期间,在低能浅潟湖条件下继续存在短期浸润。托阿尔期至早巴约卡期的环境变化和最早晚巴约卡期的短期浸润,以及晚巴约卡期-巴松期的环境变化被解释为短期的海平面变化。叶西罗瓦茨克下-中侏罗世碳酸盐序列与近地中海平台的碳酸盐序列相关。在地层和地貌方面,它们与其他金牛座碳酸盐序列非常相似。古生物学和沉积学分析使我们能够重建叶西罗瓦茨克碳酸盐沉积在侏罗纪下-中叶时期的详细年代和古环境演变。
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Stratigraphy and microfacies analysis of the Lower–Middle Jurassic platform carbonate succession in the Yeşilovacık (Mersin) area (Central Taurides, S Turkiye)
This study covers the detailed analyses of stratigraphy, microfacies and depositional environments of the Lower-Middle Jurassic carbonate succession in the southern part of Anatolide-Tauride Carbonate Platform in southern Türkiye (south of Central Taurides, around Yeşilovacık). The carbonate succession is composed of the Dibekli and Tokmar formations, and the Işıklıkızıtepe Member which forms the base of the Tokmar Formation. The Dibekli Formation (Upper Sinemurian-Lower Bajocian) is composed of limestones intercalated with intraformational conglomerates in the lower parts, with dolostones in the lower to middle parts and with oncoidal limestones in middle to upper parts. The Işıklıkızıtepe Member (Upper Bajocian) starts with basal conglomerates containing brown-red- iron nodules and consists of sandstone and sandy-clayey limestone alternations. These are overlain by thin limestone layers passing upward to thick-bedded dolostones of the Tokmar Formation (Upper Bajocian–Bathonian). The middle to upper parts of the formation are composed of sandy, oncoidal limestones rich in bivalve shells and end with dolostones-limestone alternations in the upper part. According to microfacies analyzes and litho-bio content; Late Sinemurian-Plesbachian is a period that low-to moderate-energy, restricted inner platform conditions dominated the depositional environments. The presence of comman intraformational conglomerates shows tectonic activity from time to time in this period. The Toarcian to the earliest Bajocian, low-energy intertidal and shallow lagoon conditions dominated the depositional environments, and in the Early Bajocian, the depositional environment changed to a high-energy sand shoal and above wave base environment. The basal conglomerate consisting of brown-red, iron-noduler and bauxite grains at the base of the earliest Late Bajocian indicates a short-term emersion and continued under low energy shallow lagoonal conditions during the Late Bajocian–Bathonian. Environmental changes during the Toarcian to Early Bajocian, and the earliest Late Bajocian short-term emersion, and the environmental changes during the Late Bajocian-Bathonian are interpreted to short-term sea level changes. Yeşilovacık Lower-Middle Jurassic carbonate sequences are correlated with those in peri-Mediterranean platforms. They show close similarities to the other Tauride carbonate sequences in terms of stratigraphy and facies. Paleontological and sedimentological analyses enable us to reconstruct a detailed dating and paleoenvironmental evolution for the Yeşilovacık carbonate deposits during the Lower-Middle Jurassic period.
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来源期刊
Journal of African Earth Sciences
Journal of African Earth Sciences 地学-地球科学综合
CiteScore
4.70
自引率
4.30%
发文量
240
审稿时长
12 months
期刊介绍: The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.
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