保存在渐新世微量化石中的放射虫和硅藻化石的岩石学研究

IF 0.7 Q4 PALEONTOLOGY
Akihide Kikukawa , Yoshiaki Aita , Noboru Furukawa , Nobuhiro Kotake
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引用次数: 0

摘要

本研究涉及保存在痕量化石中的硅质微化石的岩石学。为此,我们选择了日本西南部鹿儿岛县种子岛岛出露的西之表地层(熊笼组)的渐新世大久保泥岩组中的痕量化石(Tasselia ordamensis)作为研究对象。具体而言,我们研究了微化石在痕量化石填充层内以及周围主泥岩中的分布模式、出现方式和保存状况。这使我们能够确定,在经过埋藏成因作用的泥岩中,痕量化石具有明显的硅质微化石保存优势。可以得出以下三个结论:(1)保存相对完好的放射虫和硅藻化石在痕量化石填充物中分布不均,其中大部分化石被解释为来自未受痕量制造者摄食和排泄活动影响的被动填充沉积物。(2) 对比痕迹化石内部和外部的保存情况,痕迹化石内部的放射虫比外部的放射虫保存得更好。(3) 在填充沉积物中被运入痕量化石的微化石在随后的埋藏压实和成岩作用中受到优先胶结作用的保护,从而形成了痕量化石的胶结体,这使得硅质微化石得到了相对较好的保存。这些结果支持了痕量化石具有保存微化石的巨大潜力这一观点。痕量化石还可被视为珍贵微古生物记录的天然档案,这些记录通常会在掩埋、压实和成岩过程中丢失。对痕量化石(如 Tasselia ordamensis)填充物中的硅质微化石进行移生学分析,有可能从整个化石记录的沉积岩中揭示出重要的古生物学新见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Taphonomy of radiolarian and diatom fossils preserved within Oligocene trace fossils

This study deals with the taphonomy of siliceous microfossils preserved in trace fossils. With this objective, we chose to study trace fossils (Tasselia ordamensis) from the Oligocene Okubo Mudstone Member of the Nishinoomote Formation (Kumage Group), exposed on Tanegashima Island, Kagoshima, southwest Japan. Specifically, we examined microfossil distribution patterns, their mode of occurrence, and state of preservation, within the infill of the trace fossil and as well as from the surrounding host mudstone. This has enabled us to establish that there is a significant siliceous microfossil preservation advantage within trace fossils in mudstones that have been subject to burial diagenesis. The following three conclusions can be made

(1) Relatively well-preserved radiolarian and diatom fossils are distributed unevenly within the trace fossil infills and most of them are interpreted to be derived from passive infilling sediment that was not affected by feeding and excretion activities of the trace maker. (2) Comparing preservation from inside and outside of the trace fossils, the radiolarians from inside the trace fossil are much better preserved than those from outside. (3) Microfossils that were transported into the trace fossil within infill sediment were protected from subsequent burial compaction and diagenesis by preferential cementation to produce a concretion of the trace fossil, and this has enabled the siliceous microfossils to be relatively well-preserved. These results support the idea that trace fossils offer significant microfossil preservation potential. Trace fossils may also be considered as natural archives of valuable micropaleontological records that would usually be lost during burial, compaction and diagenetic processes. Taphonomic analysis of siliceous microfossils within the infills of trace fossils, such as Tasselia ordamensis, has the potential to reveal significant new paleontological insight from sedimentary rocks throughout the fossil record.

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来源期刊
CiteScore
2.50
自引率
0.00%
发文量
17
期刊介绍: La Revue de micropaléontologie publie 4 fois par an des articles de intérêt international, consacrés à tous les aspects de la micropaléontologie. Les textes, en anglais ou en français, sont des articles originaux, des résultats de recherche, des synthèses et mises au point, des comptes rendus de réunions scientifiques et des analyses de ouvrages. La revue se veut résolument ouverte à tous les aspects de la micropaléontologie en accueillant des travaux traitant de la systématique des microfossiles (et de leurs équivalents actuels), des bactéries aux microrestes de vertébrés, et de toutes leurs applications en sciences biologiques et géologiques.
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