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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >Silicified wood from the Czech part of the Intra Sudetic Basin (Late Pennsylvanian, Bohemian Massif, Czech Republic): systematics, silicification and palaeoenvironment
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Silicified wood from the Czech part of the Intra Sudetic Basin (Late Pennsylvanian, Bohemian Massif, Czech Republic): systematics, silicification and palaeoenvironment

机译：来自南苏丹内部盆地的捷克部分的硅化木材（捷克共和国波西米亚地块晚期宾夕法尼亚州）：系统化，硅化和古环境

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摘要

Silicified trunks, colloquially called "araukarity", are plentiful plant fossils of the Late Pennsylvanian in the Czech part of the Intra Sudetic Basin (ISB) in NE Bohemia. They are predominantly embedded in Zaltman Arkoses, a unit of fluvial sediments deposited during Barruelian, Late Carboniferous. This unit is a part of the Odolov Formation with the richest outcrops in the area of "Jestrebi hory" (Hawk Mts.). Since GOEPPERT (1857) firstly described these fossils as species Araucarites brandlingii and A. schrollianus, interpreting both as conifer woods close to the Araucariaceac, they have later never been re-examined or studied as a whole by any modern analytical methods. As the original material of GOEPPERT Was unavailable to our Study, we re-evaluated the previous taxonomical assignments on the basis of newly collected material and supplemented a detailed description of their mineral matter (petrography, mineralogy). Following the modern classification, A. brandlingii (= Dadoxylon brandlingii) describes the wood of cordaites, and Araucarites schrollianus (= Dadoxylon saxonicum syn. Dadoxylon schrollianum) is a name of conifer wood, but our systematical study proves only the presence of cordaites. The pycnoxylic stems were silicified in alluvia without apparent influence of volcanic material. Data from sedimentary structures were used for reconstructions of palaeostreams. The weathering of feldspars is presumed as a source of silicification amplified by the oscillation of water table under seasonally and periods within Late Pennsylvanian/Early Permian long climate cycles. This mode of permineralization is responsible for frequently poor preservation and high recrystallization of these fossils. Their mineral mass consists of pure highly crystalline quartz without other SiO2 phases. Cathodoluminescence (CL) microscopy and spectroscopy revealed a polyphase process of silicification including influence of thermal fluids which healed cracks in previously silicified mass. It is possible that all these facts responsible for poor preservation of anatomical features of Dadoxylon wood type have precluded its more detailed taxonomical study for more than one century.
机译：硅化的树干俗称“荒芜”，是波西米亚内超盆地（ISB）捷克部分捷克宾夕法尼亚州晚期的大量植物化石。它们主要嵌入在Zaltman Arkoses中，Zaltman Arkoses是晚石炭纪Barruelian时期沉积的河流沉积单元。该单元是奥多洛夫组的一部分，在“杰斯特雷比霍里”地区（霍克山）露头最丰富。自从GOEPPERT（1857）首次将这些化石描述为Araucarites brandlingii和A. schrollianus物种，将它们解释为接近Araucariaceac的针叶林后，以后再也没有通过任何现代分析方法对其进行过全面的研究或研究。由于GOEPPERT的原始材料无法用于我们的研究，因此我们在新收集的材料的基础上重新评估了以前的分类学任务，并补充了对其矿物物质（岩相学，矿物学）的详细描述。按照现代分类，A。brandlingii（= Dadoxylon brandlingii）描述了堇青石的木材，而Araucarites schrollianus（= Dadoxylon saxonicum syn。Dadoxylon schrollianum）是针叶树木材的名称，但是我们的系统研究仅证明了堇青石的存在。苯丙酸根茎在硅藻土中被硅化，而没有火山物质的明显影响。来自沉积结构的数据被用于古河的重建。长石的风化被认为是在宾夕法尼亚州晚期/早二叠纪长气候周期内的季节和时期下地下水位的振荡放大了硅化作用的来源。这种矿化模式经常导致这些化石的不良保存和高重结晶。它们的矿物质由不含其他SiO2相的纯高结晶石英组成。阴极发光（CL）显微镜和光谱学揭示了硅化作用的多相过程，其中包括热流体的影响，这些流体可以治愈先前硅化的物质中的裂缝。所有可能导致Dadoxylon木材类型的解剖特征保存不佳的事实，已经有超过一个世纪的历史，无法进行更详细的分类学研究。

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