Ichnofabrics of shallow-marine mudstone, the result of changing environmental conditions: an example from the Middle Jurassic ore-bearing clay from southern Poland

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• 作者：Paulina Leonowicz
• 关键词：Marine mudstone ; Trace fossils ; Ichnofabric ; Ore ; Bearing Cz?stochowa Clay Formation ; Middle Jurassic ; Silesian ; Kraków Upland
• 刊名：Facies
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：61
• 期：3
• 全文大小：4,717 KB
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  Gedl P, Boczarowski A, Kaim A, K?dzierski M, Leonowicz P, Smoleń J, Szczepanik P, Witkowska M (2006a) Field trip B1—biostratigraphical framework from Bajocian to Oxfordian. Stop B1.5—Sowa’s and Gliński’s clay pits (uppermost Bajocian–lowermost Bathonian). Lithology, fossil assemblages and palaeoenvironment. In: Wierzbowski A et al (eds) Jurassic of Poland and adjacent Slovakian Carpathians. Field trip guidebook. 7th international congress on the Jurassic System, Kraków, Poland, 6-8 September 2006, pp 151-52
  Gedl P, Boczarowski A, Kaim A, K?dzierski M, Leonowicz P, Smoleń J, Szczepanik P, Witkowska M (2006b) Field trip B1—biostratigraphical framework from Bajocian to Oxfordian. Stop B1.6—Leszczyński’s clay pit (Lower Bathonian). Lithology, fossil assemblages and palaeoenvironment. In: Wierzbowski A et al (eds) Jurassic of Poland and adjacent Slovakian Carpathians. Field trip guidebook. 7th international congress on the Jurassic System, Kraków, Poland, 6-8 September 2006, pp 153-54
  Gedl P, Boczarowski A, Dudek T, Kaim A, K?dzierski M, Leonowicz P, Smoleń J, Szczepanik P, Witkowska M, Ziaja J (2006c) Field trip B1—biostratigraphical framework from Bajocian to Oxfordian. Stop B1.7—Gnaszyn clay pit (Middle Bathonian–lowermost Upper Bathonian). Lithology, fossil assemblages and palaeoenvironment. In: Wierzbowski A et al (eds) Jurassic of Poland and adjacent Slovakian Carpathians. Field trip guidebook. 7th international congress on the Jurassic System, Kraków, Poland, 6-8 September 2006, pp 155-56
  Gedl P, Kaim A, Leonowicz P, Boczarowski A, Dudek T, K?dzierski M, Rees J, Smoleń J, Szczepanik P, Sztajner P, Witkowska
• 作者单位：Paulina Leonowicz (1)
  
  1. Faculty of Geology, University of Warsaw, ?wirki i Wigury 93, 02-089, Warsaw, Poland
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Sedimentology
  Biogeosciences
  Geochemistry
  Paleontology
  Ecology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1612-4820

文摘

Analysis of the trace fossil association and ichnofabrics from a Middle Jurassic shallow-marine mudstone, referred to as the Ore-Bearing Cz?stochowa Clay Formation, is used to reconstruct the seafloor conditions and identify the factors responsible for their changes. The trace fossil association contains Chondrites, Trichichnus, Palaeophycus, Planolites, Protovirgularia, ?Rosselia, Schaubcylindrichnus, Taenidium, cf. Tasselia, Thalassinoides, and five types of pyritized burrow. The association represents the distal expression of Cruziana ichnofacies, temporarily changing to a more proximal development. The ichnofacies suggests that the depositional site was located in the lower offshore to offshore-transition zone, periodically passing to the distal lower shoreface. Eight subtypes of the ichnofacies are recognized, reflecting variations in seafloor oxygenation, sedimentation rate, and benthic food content. The sequence of ichnofabrics 1a-b-a-b reflects increasing oxygenation; ichnofabrics 4a, 4b, and 5 record high sedimentation rates, whereas ichnofabric 3 reflects sediment starvation. Vertical changes of ichnofabrics reflect major fluctuations in basin depth and distance from the shoreline, which partly correlate with previously recognized transgressive–regressive cycles. However, they do not record minor variations of the shoreline position.