北克罗地亚盆地早中新世古环境变化的新证据:微体化石组合的启示

IF 1.6 4区 地球科学 Q2 PALEONTOLOGY Geobios Pub Date : 2023-04-01 DOI:10.1016/j.geobios.2023.01.005
Valentina Hajek-Tadesse , Lara Wacha , Marija Horvat , Ines Galović , Koraljka Bakrač , Anita Grizelj , Oleg Mandic , Bettina Reichenbacher
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引用次数: 1

摘要

对Poljanska和Mala剖面(北克罗地亚盆地)中新世下部沉积物进行了综合地层研究,并对凝灰岩和粉砂质砂层进行了40Ar/39Ar测年、地球化学和矿物学研究。沉积记录表明沉积受到火山碎屑输入的影响。海相、半咸水和非海相微化石的存在表明了复杂的古环境、古生态和古生物地理。根据化石含量和沉积学资料,确定了四个不同的单元。在Poljanska剖面(P1单元)底部,凝灰岩沉积物中含有常见的特有半咸淡水,以及罕见的海相到淡水和陆相微化石。对该层火山玻璃碎片进行40Ar/39Ar测年,结果表明该层的年龄为22.2±1.9 Ma,与早中新世早期相吻合,表明北秦岭区存在较早的火山活动。演替过渡到咸淡水湖泊环境(单元P2)。该单元假定有两种不同的气候事件:间隔下部的最高温度事件和间隔上部识别的较低温度中断。研究沉积物最上层(P3单元)的湖沼和海洋物种共存,表明有海流进入沿海湖泊。它标志着波扬斯卡盐碱湖形成的开始。在Mala剖面(M1单元),生物地层年代定在NN4带,通过海洋钙质纳米浮游生物、浮游和底栖有孔虫以及介形虫的存在,记录了海侵序列。
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New evidence for Early Miocene palaeoenvironmental changes in the North Croatian Basin: Insights implicated by microfossil assemblages

An integrated stratigraphic study has been performed of the Lower Miocene deposits of the Poljanska and Mala sections (North Croatian Basin), coupled with 40Ar/39Ar dating, geochemical and mineralogical study of tuffitic and silty sand beds. The sedimentary record evidences deposition influenced by volcaniclastic input. The presence of marine, brackish and non–marine microfossils indicates complex palaeoenvironment, palaeoecology, and palaeobiogeography. Four different units were recognized based on their fossil content and sedimentological data. At the base of the Poljanska section (Unit P1), tuffitic sediments bear common endemic brackish, and rare marine to freshwater and terrestrial microfossils. Radiometric 40Ar/39Ar dating obtained on volcanic glass shards from this layer provided an age of 22.2 ± 1.9 Ma correlating with the earliest Early Miocene and indicating the existence of older volcanic activity in the NCB pro tempore. The succession transitions into the brackish-water lacustrine environments (Unit P2). This unit has two presumed different climatic events: a maximum temperature event in the lower part of the interval and one interruption with lower temperatures recognized in the upper part of the interval. The co-occurrence of limnic and marine species in the uppermost part of the investigated sediments (Unit P3) indicates a marine inflow into the coastal lake. It marks the beginning of a salina-type lake formation in Poljanska. In the Mala section (Unit M1), biostratigraphically dated to the NN4 Zone, a transgressive sequence is documented through the presence of marine calcareous nannoplankton, planktonic and benthic foraminifera, and ostracods.

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来源期刊
Geobios
Geobios 地学-古生物学
CiteScore
3.30
自引率
6.20%
发文量
28
审稿时长
6-12 weeks
期刊介绍: Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils. Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.
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