Sedimentology and biostratigraphy of the Biancone Limestone Formation of the Tolmin Basin (Southern Alps, NW Slovenia)

IF 1.9 3区 地球科学 Q1 GEOLOGY
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Abstract

The Tolmin Basin constitutes the western part of the Slovenian Basin, a large Mesozoic interplatform basin that was bounded to the north by the Julian Carbonate Platform and to the south by the Dinaric Carbonate Platform. Today, it is found along the structural boundary between the Southern Alps and the External Dinarides in northwestern Slovenia. After the drowning of the Julian Carbonate Platform, the Tolmin Basin was dominated by pelagic deposits, namely the Toarcian marlstones (Perbla Formation), the Aalenian to lower Tithonian siliceous limestones and radiolarites (Tolmin Formation), and the upper Tithonian to the Berriasian Biancone Limestone Formation. In this study, a basin-scale sedimentary evolution and calpionellid biostratigraphy of the latter is presented. The Biancone Limestone Formation is a calpionellid-bearing pelagic limestone typical of all deepened segments of the Adria microplate in this time interval. It is generally monotonous but shows considerable vertical and lateral variations. The lower boundary with radiolarites is sharp, revealing a pronounced and rapid overturn in pelagic sedimentation. The lower Berriasian slumps indicate a tectonic pulse. Rare beds of resedimented limestones, assigned to the middle Berriasian, are similar in composition to those intercalated in the underlying radiolarites. They thus show that the factors that led to a significant shift in pelagic sedimentation had little or no effect on shallow-marine carbonate production. In the upper Berriasian, an increase in clay content is evident in the formation, which is explained by the uplift and erosion of the propagating thrust belt in the Neotethys area, superimposed by humidification.

托尔明盆地(斯洛文尼亚西北部,南阿尔卑斯山)比安科内石灰岩地层的沉积学和生物地层学
托尔明盆地是斯洛文尼亚盆地的西部,斯洛文尼亚盆地是中生代的一个大型地台间盆地,其北部以朱利安碳酸盐地台为界,南部以迪纳拉碳酸盐地台为界。如今,该盆地位于斯洛文尼亚西北部南阿尔卑斯山与外第纳尔山脉之间的构造边界上。朱利安碳酸盐地台被淹没后,托尔明盆地主要是浮游沉积物,即托尔干泥灰岩(佩布拉地层)、阿伦纪至下提托尼硅质灰岩和放射石(托尔明地层),以及上提托尼至贝里亚纪比安科内灰岩地层。本研究介绍了后者的盆地尺度沉积演化和钙钛矿生物地层学。比安科内石灰岩层是这一时期阿德里亚微板块所有加深区段的典型钙华浮游石灰岩。该地层总体上比较单调,但在垂直和横向上有相当大的变化。与放射虫岩的下边界非常尖锐,显示了浮游沉积的明显快速翻转。下贝里亚坍塌表明了构造脉动。属于中贝里亚世的稀有再沉积石灰岩层在成分上与下层放射岩中的夹层相似。因此,它们表明,导致浮游沉积发生重大转变的因素对浅海碳酸盐的生成几乎没有影响。在上白垩统中,粘土含量明显增加,其原因是新特提斯地区推力带的抬升和侵蚀以及潮湿化的叠加。
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来源期刊
Cretaceous Research
Cretaceous Research 地学-地质学
CiteScore
4.10
自引率
19.00%
发文量
235
审稿时长
12 weeks
期刊介绍: Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.
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