CHANGES IN ENVIRONMENTAL CONDITIONS, BIOTA, AND DEPOSITIONAL PATTERNS WITHIN LOWER TRIASSIC CLASTIC AND CARBONATE DEPOSITS, MUĆ-OGORJE, CENTRAL DALMATIA (CROATIA)

IF 1.5 4区地球科学 Q2 GEOLOGY

Palaios Pub Date : 2022-01-31 DOI:10.2110/palo.2020.082

Karmen Fio Firi, Katarina Gobo, J. Sremac, Frane Marković

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Abstract

Abstract: The Lower Triassic of the Muć-Ogorje area in Central Dalmatia (southern Croatia) is characterized by clastic and carbonate deposits which are investigated through a 230 m thick succession. The fossil associations identified point to a Dienerian age for the lower, and a Spathian age for the upper part of the studied profile, while trace fossils suggest deposits of Smithian age in the middle part, enabling comparisons with other successions in the region. Changes in sedimentology and associated biota throughout the succession, and environmental conditions are reconstructed for seven facies associations, the distribution of which suggests multiple oscillations in relative sea level. Sedimentary structures point to the influence of high environmental energy, possible storms, with signs of tectonic influence in the studied area. The study deposits lack ooid limestone intervals, which are well represented in other Lower Triassic sections in Croatia, Slovenia, Italy, and Hungary. Moreover, the study section exhibits changes in biota abundance, presence of organic-rich laminae and pyrite, as well as changes in siliciclastic input and transgressive-regressive cycles, especially within the upper, Olenekian, part of the succession studied. The results confirm that environmental stress was persistent throughout the Early Triassic, and contribute to our better understanding of the aftermath of the end Permian extinction and the environmental conditions of the western Tethys epicontinental shelf area.

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达尔马提亚（克罗地亚）中部穆奥戈日下三叠统碎屑岩和碳酸盐岩矿床内环境条件、生物群和沉积模式的变化

摘要：达尔马提亚中部（克罗地亚南部）Muć-Ogorje地区的下三叠统以碎屑岩和碳酸盐岩矿床为特征，通过230米厚的层序进行了研究。所确定的化石组合表明，研究剖面下部为Dienerian时代，上部为Spathian时代，而痕迹化石表明，中部为Smithian时代的沉积物，可以与该地区的其他序列进行比较。在整个演替过程中，沉积学和相关生物群的变化以及环境条件被重建为七个相组合，其分布表明相对海平面存在多次振荡。沉积结构表明受高环境能量、可能的风暴的影响，研究区域有构造影响的迹象。研究矿床缺乏卵状石灰岩层段，这在克罗地亚、斯洛文尼亚、意大利和匈牙利的其他下三叠统剖面中有很好的代表性。此外，研究剖面显示了生物群丰度的变化、富含有机物的薄层和黄铁矿的存在，以及硅质碎屑输入和海侵-海退旋回的变化，特别是在所研究的层序的上部Olenekian。研究结果证实，环境应力在整个三叠纪早期持续存在，有助于我们更好地了解二叠纪末灭绝的后果和特提斯大陆架西部的环境条件。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Palaios 地学-地质学

CiteScore

2.80

自引率

12.50%

发文量

审稿时长

6 months

期刊介绍： PALAIOS is a monthly journal, founded in 1986, dedicated to emphasizing the impact of life on Earth''s history as recorded in the paleontological and sedimentological records. PALAIOS disseminates information to an international spectrum of geologists and biologists interested in a broad range of topics, including, but not limited to, biogeochemistry, ichnology, paleoclimatology, paleoecology, paleoceanography, sedimentology, stratigraphy, geomicrobiology, paleobiogeochemistry, and astrobiology. PALAIOS publishes original papers that emphasize using paleontology to answer important geological and biological questions that further our understanding of Earth history. Accordingly, manuscripts whose subject matter and conclusions have broader geologic implications are much more likely to be selected for publication. Given that the purpose of PALAIOS is to generate enthusiasm for paleontology among a broad spectrum of readers, the editors request the following: titles that generate immediate interest; abstracts that emphasize important conclusions; illustrations of professional caliber used in place of words; and lively, yet scholarly, text.