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首页> 外文期刊>Stratigraphy >A chronostratigraphy for the Dinaride Lake System deposits of the Livno-Tomislavgrad Basin: the rise and fall of a long-lived lacustrine environment
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A chronostratigraphy for the Dinaride Lake System deposits of the Livno-Tomislavgrad Basin: the rise and fall of a long-lived lacustrine environment

机译：利夫诺-托米斯拉夫格勒盆地迪纳里德湖系沉积物的年代地层：长寿命湖相环境的兴衰

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摘要

The Dinarides are an integral part of the Alpine orogenic belt and stretch over large parts of Slovenia, Croatia, Bosnia-Herzegovina, Monte Negro and Serbia. A great number of intra-montane basins formed in the interior of this Late Eocene to Early Oligocene orogen during the Miocene. These basins harbored a suite of long-lived lakes, collectively called the Dinaride Lake System (DLS). Lake Livno, with its 600km(2) of preserved surface, was the second largest of these Dinaride Lakes. At present, its deposits are divided between the Livno and Tomislavgrad basins, which were part of a single basin when Lake Livno first formed. High resolution age constraints for the over 2km basin infill have been lacking up to now, partly due to the endemic nature of its lacustrine fauna. This severely hampered geodynamic as well as paleoenvironmental reconstructions. Here, we present a chronostratigraphy based on radioisotopic and magnetostratigraphic data. (40)Ar/(39)Ar measurements reveal that the Tunica volcanic ash, found in between the Gomphoteriumbearing coal seams at the base of the basin infill, is 17.00 +/- 0.17 Ma old. (40)Ar/(39)Ar dating of the Mandek ash, correlative to the uppermost sedimentary unit, provides an age of 14.68 +/- 0.16 Ma. Correlation of the composite magnetostratigraphy for the main lacustrine depositional phase to the Astronomically Tuned Neogene Time Scale is straightforward and reveals that the majority of the deposits of Lake Livno accumulated between 17 Ma and approximately 13 Ma. The disappearance of Lake Livno is most likely attributable to a change in tectonic regime. Calcarenites and breccias, derived from the basin margins, first entered the lake around 14.8 Ma and subsequently coarsened and thickened upwards. The basin margins were apparently gradually uplifted before subsidence stalled. Comparison with chronostratigraphic data for other constituents of the DLS leads to the conclusion that their lifetimes largely coincide. Finally, we calibrate the most important marker fossils of the various Dinaride basins to the geological time scale and we present a new biochronological scheme for the DLS.
机译：第纳里底河是高山造山带的组成部分，延伸到斯洛文尼亚，克罗地亚，波斯尼亚和黑塞哥维那，蒙特内格罗和塞尔维亚的大部分地区。在中新世期间，这个晚始新世至渐新世造山带的内部形成了大量的山地盆地。这些盆地中有一组长寿的湖泊，统称为Dinaride Lake System（DLS）。拥有600公里（2）保留面积的利夫诺湖是这些Dinaride湖中的第二大湖泊。目前，它的沉积物被划分为利夫诺盆地和托米斯拉夫格勒盆地，这是利夫诺湖刚形成时属于单个盆地的一部分。迄今为止，对于2 km以上的盆地填充物，高分辨率年龄的限制一直缺乏，部分原因是其湖泊动物群具有地方性。这严重阻碍了地球动力学以及古环境的重建。在这里，我们根据放射性同位素和磁地层学数据提出年代地层学。 （40）Ar /（39）Ar测量结果表明，在盆地填充物底部的含Gomphoterium的煤层之间发现的Tunica火山灰为17.00 +/- 0.17 Ma。与最上面的沉积单元有关的曼德克灰分的（40）Ar /（39）Ar年代为14.68 +/- 0.16 Ma。主要湖相沉积相的复合地层学与天文学调整的新近纪时间尺度的相关性很简单，揭示了Livno湖的大部分沉积物在17 Ma和大约13 Ma之间积累。利夫诺湖的消失很可能归因于构造制度的变化。钙质和角砾岩起源于盆地边缘，最初在14.8 Ma左右进入湖泊，然后向上变粗并变厚。在沉陷停止之前，盆地边缘显然逐渐升高。与DLS其他组成部分的年代地层数据的比较得出结论，即它们的寿命在很大程度上吻合。最后，我们将各个迪纳里德盆地最重要的标记化石校准到地质时标，并为DLS提出了一种新的生物年代学方案。

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