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Upper Triassic‒Middle Jurassic resedimented toe-of-slope and hemipelagic basin deposits in the Dinaridic Ophiolite Belt, Zlatar Mountain, SW Serbia
Facies ( IF 1.8 ) Pub Date : 2019-03-30 , DOI: 10.1007/s10347-019-0566-3
János Haas , Divna Jovanović , Ágnes Görög , Milan N. Sudar , Sándor Józsa , Péter Ozsvárt , Pál Pelikán

In the Dinaridic Ophiolite Belt, small (m-scale) to large (km-scale) blocks of Middle to Upper Triassic, and Middle to Upper Jurassic, more or less silicified bedded limestone are widely present, both as parts of para-autochthonous successions and as redeposited blocks in ophiolitic mélanges. The studied, approximately 230-m-thick succession in the wider area of Zlatar Mountain, is one of the most important para-autochthonous sections in the Serbian part of the Dinaridic Ophiolite Belt. The succession is made up of an alternation of redeposited carbonate toe-of-slope deposits, sand to clay-sized siliciclastic rocks, hemipelagic mudstones and radiolarite–spongiolite basin facies. In the lower part of the sequence, the components of the siliciclastic beds were derived mostly from low- and medium-grade metamorphic rocks. Similar components, together with sand-sized fragments of ophiolitic rocks, were encountered in small amounts in some redeposited carbonate beds. The chronostratigraphic assignment of the succession is based mostly on foraminifers, but age-diagnostic radiolarians and other microfossil groups were also considered. In the lower part of the probably continuous succession, a Norian–Rhaetian assemblage was recognized; a Sinemurian–Pliensbachian assemblage was encountered up-section, whereas the upper part of the succession could be assigned to the Bajocian–Bathonian. Considering the paleogeographic reconstructions and the analogies of age-equivalent sections, the succession records the depositional history of the Bosnian Basin during the Late Triassic to Middle Jurassic period and may contribute to the understanding of the evolution of the Adriatic margin of the Neotethys Ocean in the transition interval from passive to active margin stages.

中文翻译:

塞尔维亚西南部 Zlatar 山第纳尔迪蛇绿岩带中上三叠世 - 中侏罗世再沉积的坡尖和半远洋盆地沉积

在 Dinaridic 蛇绿岩带中,中到上三叠统和中到上侏罗统的小(m 级)到大(km 级)块体广泛存在或多或少硅化层状石灰岩,两者都是准本土序列的一部分并作为蛇绿混杂岩中的再沉积块。所研究的在 Zlatar Mountain 更广阔区域内大约 230 米厚的序列是 Dinaridic 蛇绿岩带塞尔维亚部分最重要的准本土部分之一。该系列由重新沉积的碳酸盐坡尖沉积物、砂土到粘土大小的硅质碎屑岩、半远洋泥岩和放射云母-海绵岩盆地相的交替组成。在层序的下部,硅质碎屑岩层的成分主要来自低、中变质岩。类似的组件,在一些再沉积的碳酸盐岩床中发现了少量蛇绿岩碎片以及沙子大小的碎片。序列的年代地层划分主要基于有孔虫,但也考虑了年龄诊断放射虫和其他微化石群。在可能连续的序列的下部,一个诺里安-雷蒂亚组合被确认;Sinemurian – Pliensbachian 组合在上段遇到,而序列的上部可以分配给 Bajocian – Bathonian。考虑到古地理重建和年龄等效剖面的类比,
更新日期:2019-03-30
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