Palaeomicrocodium: A New View on Its Origin

A. I. Antoshkina

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Palaeomicrocodium: A New View on Its Origin

机译：古微co：其起源的新观点

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Remains of Palaeomicrocodium from the Silurian and Devonian carbonate and clay deposits from the Timan-Northern Ural region, Salair, and Western Siberia are studied using various lithological and geochemical techniques. Characters suggesting their paleoecological and geochemical specialization are discussed. It is suggested that Palaeomicrocodium structures belong to ancient lichens or actinolichens. This hypothesis is based on a number of features of Palaeomicrocodium, including the presence of typical biologically fixed microelements of soil, such as Co, Cu, Zn, Ni, and Cd, sourced from the atmosphere; presence of kerogen carbonaceous matter in prismatic calcite monocrystals of Palaeomicrocodium; identification in their structure of probable hypha-like and rhizoid-like structures; morphological similarity to extant encrusting lichens. Like lichens, Palaeomicrocodium significantly contributed to chemical weathering of rocks by excreting various organic acids, which could effectively dissolve minerals and chelate metallic cations. As a result of the weathering induced by vital function of Palaeomicrocodium, rock-forming minerals exhibit surface corrosion.

机译：使用各种岩性和地球化学技术研究了志留系和泥盆系碳酸盐岩中古微co的残留物，以及来自Timan-Northern Ural地区，Salair和西西伯利亚的粘土沉积物。讨论了表明其古生态和地球化学专业性的特征。建议古微Pala结构属于古代地衣或放线菌。该假设基于古微co的许多特征，包括存在于大气中的典型的生物固定的微量元素，例如Co，Cu，Zn，Ni和Cd。古微柱状方解石单晶中存在干酪根碳质物质;在其结构中鉴定可能的菌丝状和类根状结构;形态上与现存的地衣相似。像地衣一样，古微co通过排泄各种有机酸来显着促进岩石的化学风化，这些有机酸可有效溶解矿物质并螯合金属阳离子。由于古微co的重要功能引起的风化，成岩矿物表现出表面腐蚀。

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《Paleontological journal》 |2014年第4期|共16页
作者
A. I. Antoshkina;
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原文格式 PDF
正文语种 eng
中图分类古生物学;
关键词
Palaeomicrocodium; lichen-like structures; paleoecological importance; chemical specialization;

机译：古微co;类地衣结构;古生态学重要性;化学专业化;

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Palaeomicrocodium: A New View on Its Origin

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