PESTRÉ SEDIMENTY OTTNANGU V BRNĚ-KOHOUTOVICÍCH

Q4 Earth and Planetary Sciences
P. Petrová, D. Buriánek, K. Kirchner, Oldřich Krejčí, František Laufek, S. Nehyba, J. Otava
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引用次数: 0

Abstract

The reddish coloured sediment layers (up to 5 m thick) were found within building pit in the Brno-Kohoutovice on the Libušina třída Avenue (NW part of Brno). These sediments were assigned to the Ottnangian based on characteristic pseudoassociation of microfossils. Smectite or illite/smectite dominates over kaolinite among the clay minerals. Minerals typomorphic for granitoids of the Brno Massif, i.e. epidote, amphibole and altered titanite, absolutely dominate (99 mod. %) within the assemblage of translucent heavy fraction. Minerals like garnet and staurolite which are typical for the Ottnangian sediments in this region, are presented only in accessoric amount. The chemical composition of the studied sediments is located between the chemical composition of granodiorites of the Brno Massif and Neogene clays. Relatively high content of Zr, Hf and HREE, which is interpreted as result of presence of very fine grained zircon in studied sediments, is characteristic. High content of SiO2 and comparatively low contents of Al2O3 and Fe2O3 indicates non-lateritic type of weathering. The chemical composition of studied sediments reflects semiarid to humid paleoclimate that the granitoids of the Brno Massif as parent rock have undergone.
BRNO-KOHOUTOVICE中OTTNANG的杵状沉积物
在Libušina třída大道(布尔诺西北部)Brno Kohoutovice的建筑坑内发现了红色沉积物层(厚度高达5米)。根据微体化石的特征性假组合,这些沉积物被归属于奥特南纪。蒙脱石或伊利石/蒙脱石在粘土矿物中占主导地位。布尔诺地块花岗质岩石的标型矿物,即绿帘石、角闪石和蚀变钛酸岩,在半透明重组分的组合中绝对占主导地位(99%)。石榴石和十字石等矿物是该地区奥斯曼沉积物的典型矿物,仅以辅助量存在。所研究沉积物的化学成分介于布尔诺地块花岗闪长岩和新近纪粘土的化学成分之间。Zr、Hf和HREE含量相对较高,这被解释为研究沉积物中存在细粒锆石的结果,是其特征。SiO2含量高,Al2O3和Fe2O3含量相对较低,表明非红土型风化。所研究沉积物的化学成分反映了布尔诺地块花岗岩类作为母岩所经历的半干旱到潮湿的古气候。
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来源期刊
Geological Research in Moravia and Silesia
Geological Research in Moravia and Silesia Earth and Planetary Sciences-Geology
CiteScore
0.40
自引率
0.00%
发文量
0
期刊介绍: The Geological research is peer-reviewed open access journal that publishes original research articles. The journal aims principally at quick publication of variety results from different fields of geological sciences and its applied sectors including interdisciplinary topics, laboratory experiments and modelling. Journal is focused on basic data and their simple and clear interpretation. Its aim is to facilitate the systematic development of the scientific body of knowledge in the field of geosciences with a span beyond the region of Central Europe. The form of articles/texts is as concise as possible. There is a section for publication of extended abstracts from conferences and meetings as well.
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