Selective colonization after storm events in a delta environment: applied ichnology from the early Miocene of Taiwan

IF 0.8 4区 地球科学 Q4 PALEONTOLOGY
O. Miguez-Salas, L. Löwemark, Yu-Yen Pan, F. Rodríguez-Tovar
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引用次数: 2

Abstract

Abstract The sedimentological and palaeoecological interpretation of early Miocene age shallow marine deposits from one of the most emblematic geological areas of Taiwan – Yehliu peninsula – is not easy to approach in detail, and several contrasting proposals can be found in the literature. The present ichnological study helps to corroborate a delta environment as the most likely palaeoenvironmental setting, and to recognize the different sub-environments and hydrodynamic processes involved. The distal delta front displays the greatest trace fossil diversity, assigned to the Cruziana ichnofacies, including Ophiomorpha, Phycosiphon, Planolites, Rosselia, Schaubcylindrichnus, Scolicia, Thalassinoides and vertical equilibrium adjustment structures. The delta front records predominantly vertical traces attributable to the Skolithos ichnofacies. Amalgamated shell beds (most likely related to storm events) show concentrations of broken bivalve shells. After storm a selective colonization is interpreted, firstly by bioerosive tracemakers during times of decreasing sedimentation rate, followed by a dominance of trophic generalists such as those producing Ophiomorpha during post-storm sedimentation.
三角洲地区风暴事件后的选择性殖民:台湾中新世早期的应用技术
摘要:台湾最具代表性的地质地区之一叶柳半岛的早中新世浅海沉积的沉积学和古生态学解释并不容易详细接近,文献中可以找到几种对比的建议。目前的技术研究有助于证实三角洲环境是最可能的古环境背景,并识别不同的亚环境和所涉及的水动力过程。远端三角洲前缘化石多样性最大,可划分为Cruziana鱼相,包括Ophiomorpha、Phycosiphon、Planolites、Rosselia、schaubichnus、Scolicia、Thalassinoides和垂直平衡调整构造。三角洲前缘主要记录了可归因于斯科利索相的垂向迹。混合的壳层(很可能与风暴事件有关)显示出双壳类破碎壳的集中。风暴后的选择性定植被解释为,首先是在沉积速率下降期间由生物侵蚀示踪器产生的,其次是在风暴后沉积期间产生蛇胚的营养通用型植物的优势。
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来源期刊
CiteScore
2.50
自引率
12.50%
发文量
0
审稿时长
>12 weeks
期刊介绍: The foremost aim of Ichnos is to promote excellence in ichnologic research. Primary emphases center upon the ethologic and ecologic significance of tracemaking organisms; organism-substrate interrelationships; and the role of biogenic processes in environmental reconstruction, sediment dynamics, sequence or event stratigraphy, biogeochemistry, and sedimentary diagenesis. Each contribution rests upon a firm taxonomic foundation, although papers dealing solely with systematics and nomenclature may have less priority than those dealing with conceptual and interpretive aspects of ichnology. Contributions from biologists and geologists are equally welcome. The format for Ichnos is designed to accommodate several types of manuscripts, including Research Articles (comprehensive articles dealing with original, fundamental research in ichnology), and Short Communications (short, succinct papers treating certain aspects of the history of ichnology, book reviews, news and notes, or invited comments dealing with current or contentious issues). The large page size and two-column format lend flexibility to the design of tables and illustrations. Thorough but timely reviews and rapid publication of manuscripts are integral parts of the process.
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