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首页> 外文期刊>Sedimentary geology >Tracing multiple resedimentation on an isolated karstified plateau: The bauxite-bearing Miocene red clay of the Southern Bakony Mountains, Hungary
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Tracing multiple resedimentation on an isolated karstified plateau: The bauxite-bearing Miocene red clay of the Southern Bakony Mountains, Hungary

机译：在一个孤立的喀斯特高原上追踪多种沉积：匈牙利南部巴科尼山的铝土矿中新世红粘土

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摘要

The Vorosto (=Red Lake) Formation, located in the Southern Bakony Mountains and the Balaton Highlands (Hungary), is a red, clayey continental assemblage containing hard, up to fist-sized bauxite pebbles, occurring in a large apparent stratigraphic gap between underlying karstified Triassic carbonates and mid' Miocene to Quaternary cover. The origin and the exact stratigraphic position of the assemblage have been controversial for a long time. In this study, petrographic observations on the bauxite pebbles revealed common features with Cretaceous bauxite deposits known in the region, whereas heavy mineral composition of the red clay matrix is similar to those known from the Eocene bauxite horizon of the region. Single grain zircon U-Pb ages obtained from the bauxite pebbles and their red clayey matrix show similar late Archean to Jurassic age components. Additionally, Cenozoic U-Pb ages are well represented in the mostly euhedral zircon crystals separated from the red clays, whereas this volcanogenic contribution completely missing from the bauxite pebbles. SEM morphology and related EDX chemical analysis of clay minerals indicate polygenetic, detrital origin for the red clays. The main source material of the bauxite bearing Vorosto Formation is most probably local Cretaceous and Eocene bauxite deposits exposed during the middle-late Miocene. These tropical weathering products were partly decomposed and degraded, but dilution by siliciclastic contribution is negligible. We suggest a transport mechanism dominated by local redeposition of mostly pelitic and allitic material through seasonal muddy debris flows within a karstic landscape. (C) 2017 Elsevier B.V. All rights reserved.
机译：位于南巴科尼山脉和巴拉顿高地（匈牙利）的沃罗斯托（红湖）地层是红色的粘土质大陆性组合，包含坚硬的，至多拳头大小的铝土矿卵石，其下伏地层之间存在明显的地层间隙。喀斯特三叠纪碳酸盐岩和中新世中期至第四纪盖层。组合的起源和确切的地层位置一直存在争议。在这项研究中，对铝土矿卵石的岩石学观察揭示了该地区已知的白垩纪铝土矿矿床的共同特征，而红粘土基质的重矿物组成与该地区始新世铝土矿层中的已知矿物特征相似。从铝土矿卵石及其红色黏土基质获得的单晶锆石U-Pb年龄显示出太古代至侏罗纪年龄的成分相似。此外，新生代U-Pb年龄在从红土中分离出的大多数为正方体的锆石晶体中得到了很好的体现，而铝土矿卵石中完全没有这种火山成因。粘土矿物的SEM形态学和相关的EDX化学分析表明，红粘土具有多源，碎屑来源。铝土矿含沃罗斯托地层的主要来源材料很可能是中新世中晚期暴露出的局部白垩纪和始新世铝土矿床。这些热带风化产物被部分分解和降解，但由硅质碎屑贡献引起的稀释可以忽略不计。我们建议一种运输机制，主要是通过岩溶景观内的季节性泥泞泥石流，对大部分胶质和同质物质进行局部再沉积。 （C）2017 Elsevier B.V.保留所有权利。

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  • 来源
    《Sedimentary geology》 |2017年第1期|84-96|共13页
  • 作者

    Kelemen Peter; Dunkl Istvan; Csillag Gabor; Mindszenty Andrea; von Eynatten Hilmar; Jozsa Sandor;

  • 作者单位

    Eotvos Lorand Univ, Dept Petr & Geochem, Pazmany Peter Setany 1-C, H-1117 Budapest, Hungary;

    Univ Gottingen, Geosci Ctr, Dept Sedimentol & Environm Geol, Goldschmidtstr 3, D-37077 Gottingen, Germany;

    Geol & Geophys Inst Hungary, Dept Geol Res, Stefania Ut 14, H-1143 Budapest, Hungary;

    Eotvos Lorand Univ, Dept Phys & Appl Geol, Pazmany Peter Setany 1-C, H-1117 Budapest, Hungary;

    Univ Gottingen, Geosci Ctr, Dept Sedimentol & Environm Geol, Goldschmidtstr 3, D-37077 Gottingen, Germany;

    Eotvos Lorand Univ, Dept Petr & Geochem, Pazmany Peter Setany 1-C, H-1117 Budapest, Hungary;

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  • 正文语种 eng
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  • 关键词

    Continental sedimentation; Bauxite; Provenance; Zircon; U-Pb; Bakony Mountains;

    机译：大陆性沉积;铝土矿;物源;锆石;U-Pb;巴科尼山;

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