Architecture and sedimentary evolution of the Ladinian Kobilji curek basin (External Dinarides, central Slovenia)

IF 1.8 2区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Boštjan Rožič, Anja Kocjančič, Luka Gale, Nina Zupančič, Tomislav Popit, Primož Vodnik, Tea Kolar-Jurkovšek, Rok Brajkovič, Petra Žvab Rožič
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Abstract

The study area is located in cental Slovenia, and geologically located at the junction between the Alps and the Dinarides. The Middle Triassic of this region is characterised by intense rifting manifested by differential subsidence and volcanism. This led to a major paleogeographic reorganisation of the region, where three paleogeographic domains formed in the Upper Triassic: The Julian Carbonate Platform in the north, the intermediate Slovenian Basin, both parts of the Southern Alps, and the Dinaric (Adriatic, Friuli) Carbonate Platform in the south, which today is a part of the External Dinarides that host the area of investigation. Prior to the installation of the Dinaric Carbonate Platfrom, i.e. in the Ladinian, the entire area of the preset-day External Dinarides broke up into numerous tectonic blocks that were exposed to either erosion or continental, shallow-marine, and deep-marine sedimentation. In this study, we analyse at small scale a complex transitional area between a local carbonate platform and the Kobilji curek basin (depositional area dominated by deeper marine sediments), located in the Rute Plateau in central Slovenia south of Ljubljana. During enhanced subsidence, the basin was filled with volcanic material (tuffs and volcanogenic clays and subordinate extrusive material), while the adjacent platform aggraded. The slope was positioned above active paleofaults. During relative sea level lowstand, the platform prograded across the basin. The study area is divided into four major tectonic paleoblocks. The NW paleoblock experienced the most enhanced subsidence, and the platform prograded twice in this area and was submerged again by the rejuvenated subsidence and/or sea-level rise. The second and third paleoblocks subsided only during discrete major subsidence events, and the carbonates of the platform and slope were soon reinstated therein. In the fourth paleoblock to the east the platform persisted during the Ladinian. In the Carnian, the entire study area became emerged, and continental clastics were deposited. These were then replaced by a uniform shallow marine/intertidal Hauptdolomit (Dolomia Principale) formation at the onset of the Norian. This study provides the first detailed reconstruction of the sedimentary evolution of small-scale Ladinian basin and platforms system in the northern External Dinarides.
拉迪南Kobilji curek盆地(斯洛文尼亚中部外迪纳里德斯地区)的构造和沉积演化
研究区域位于斯洛文尼亚中部,在地质学上位于阿尔卑斯山和迪纳利山脉的交界处。该地区中三叠世的特点是强烈的断裂,表现为不同程度的沉降和火山活动。这导致了该地区重大的古地理重组,在上三叠世形成了三个古地理区域:北部的朱利安碳酸盐地台、中间的斯洛文尼亚盆地(均为南阿尔卑斯山脉的一部分)和南部的迪纳利(亚得里亚海、弗留利)碳酸盐地台,如今是考察区域所在的外迪纳利山脉的一部分。在迪纳拉碳酸盐地台形成之前,即拉迪南时期,今天的外迪纳拉山系整个地区分裂成许多构造块,这些构造块要么受到侵蚀,要么受到大陆、浅海和深海沉积作用的影响。在本研究中,我们对位于斯洛文尼亚中部卢布尔雅那以南鲁特高原的当地碳酸盐平台与 Kobilji curek 盆地(以深海沉积物为主的沉积区)之间的复杂过渡区进行了小规模分析。在强化沉降过程中,盆地被火山物质(凝灰岩和火山粘土及其附属的喷出物质)填满,而邻近的平台则发生了增生。斜坡位于活跃的古断层之上。在海平面相对较低的时期,地台在盆地内逐渐移动。研究区域被划分为四大古构造块。西北古地块经历了最严重的沉降,平台在这一区域两次前移,并再次被恢复的沉降和/或海平面上升所淹没。第二和第三古地块仅在不连续的大沉降事件中发生沉降,平台和斜坡的碳酸盐岩很快在其中恢复原状。在东面的第四个古区块,平台在拉迪年时期一直存在。在卡尼期,整个研究区域都出现了沉积,大陆碎屑沉积。这些沉积物在诺尔纪开始时被统一的浅海/潮间带 Hauptdolomit(Dolomia Principale)地层所取代。这项研究首次详细重建了外第纳尔山脉北部小规模拉迪南盆地和地台系统的沉积演化过程。
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来源期刊
Swiss Journal of Geosciences
Swiss Journal of Geosciences 地学-地质学
CiteScore
4.50
自引率
12.90%
发文量
21
审稿时长
>12 weeks
期刊介绍: The Swiss Journal of Geosciences publishes original research and review articles, with a particular focus on the evolution of the Tethys realm and the Alpine/Himalayan orogen. By consolidating the former Eclogae Geologicae Helvetiae and Swiss Bulletin of Mineralogy and Petrology, this international journal covers all disciplines of the solid Earth Sciences, including their practical applications. The journal gives preference to articles that are of wide interest to the international research community, while at the same time recognising the importance of documenting high-quality geoscientific data in a regional context, including the occasional publication of maps.
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