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- Matveev, AndriyV.N. Karazin Kharkiv National University, Kharkiv, Ukraine (författare)
Jurassic system stratigraphy at the Kamianka village. Part 1. The Kozhulinska formation
- Artikel/kapitelUkrainska2023
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- Kharkiv, Ukraine,2023
- electronicrdacarrier
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- LIBRIS-ID:oai:DiVA.org:nrm-5469
- https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-5469URI
- https://doi.org/10.26565/2410-7360-2023-58-05DOI
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- Despite the active research of Jurassic system deposits of Donbas during the last two centuries theissue of their stratigraphy principles is still debatable. Theauthors` analysis of the available scientific material revealedaconflict between the normatively established requirement to rely on lithostratigraphy duringthe sediment research, andthe fact that the existing common system relies on biostratigraphy. This contradiction could be solved by the study oflithostratigraphic units of the Donetsk Jurassic deposits. Therefore, the purpose of the article was to research the Kozhu-linska formation, establish its composition and describe its main features. The Lower Jurassic deposits from the outcropsnear the village of Kamyanka (Izyum district) were studied, since the studyable stratotypes of most of the Jurassic strata,which are well exposed in the studied area, are available in this area.Material and methods. The scientific search was based on the analysis of literature, results of previous drilling andmapping works, as well as own field, laboratory and analyticalstudies. Clay samples were taken from different strati-graphic levels of the formation and from different lithologicalvarieties. Laboratory research was carried out in two direc-tions: using an electron microscope and a spectrometer to detect the material composition of clays. A palynological anal-ysis of these deposits was also carried out, namely, stratifieddeposits with the help of microphytofossils, including, forthe first time, according to the orthostratigraphic group – dinocysts.Results and discussion. The results showed that the Kozhulinska formation was mainlyrepresented by shaly clays(gray, dark gray, sometimes blue-gray) that contained relatively thin layers of sandstones. The main mass of clays con-sisted of hydromicas, with an insignificant content of montmorillonite, and an even smaller amount of kaolin. The layersof quartz sandstones cemented withclay material were separately traced along the strike.Paleontological remains in the clays of Kozhulinska formation were rare. Palynological groups are mainly repre-sented by pollen and spores, as well as remains of dinophytes,green algae and acritarchs. According to paleoalgologicalanalysis, the sediments of the Kozhulinska formation are datedfor the first time.Stratigraphy. Kozhulinska formation is represented by a fairly uniform layer of montmorillonite clays of hydromicacomposition. The clays are mainly siltstone, but there are, especially in the lower part, washed clean varieties. It is im-possible to divide the formation into sub formation based on lithological features. According to biostratigraphic data,deposits are divided into Plinsbachian, Toarian and Aalenian.Paleogeography. At the end of the Early Jurassic and the beginning of the Middle Jurassic era, the territory of theKamianska area was a low-lying part of the seabed that was drained during low tides. The land that surrounded it wasalso low-lying and almost did not supply detrital material, however, there is a regular removal of plant detritus. The sourceof the terrigenous material was the sedimentary complexes of the Donetsk Ridge. Features of the chemical compositionof the world are a significant amount of iron (siderite, ocher,chamosite) and the absence of calcium and magnesiumcarbonates. At the end of the early Aalene, this unstable basinfinally regresses, which leads to the accumulation of apowerful subaerial pack of sandstones, which weigh and border the cores of anticlines - elevated areas of the bottom orsmall islands.
Ämnesord och genrebeteckningar
- Jurassic system
- North-Western Donbas
- stratigraphy
- lithology
- paleontological remains
- Ecosystems and species history
- Ekosystem och arthistoria
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Pakki, MariannaV.N. Karazin Kharkiv National University, Kharkiv, Ukraine (författare)
- Shevchuk, OlenaNaturhistoriska riksmuseet,Enheten för paleobiologi(Swepub:nrm)olenshev (författare)
- Klevcov, OleksandrV.N. Karazin Kharkiv National University, Kharkiv, Ukraine (författare)
- V.N. Karazin Kharkiv National University, Kharkiv, UkraineEnheten för paleobiologi (creator_code:org_t)
Sammanhörande titlar
- Ingår i:Bulletin of Kharkiv National University named after V.N. KarazinKharkiv, Ukraine:58, s. 59-722410-73602411-3913
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- Matveev, Andriy
- Pakki, Marianna
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