气候变化领域集成服务门户(CCPortal): Microbially induced sedimentary structures (MISSs) from the Lower Triassic Kockatea Formation; northern Perth Basin; Western Australia: Palaeoenvironmental implications

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DOI	10.1016/j.palaeo.2018.06.040
	Microbially induced sedimentary structures (MISSs) from the Lower Triassic Kockatea Formation; northern Perth Basin; Western Australia: Palaeoenvironmental implications
	Luo M.; Chen Z.-Q.; Shi G.R.; Feng X.; Yang H.; Fang Y.; Li Y.
发表日期	2019
ISSN	0031-0182
起始页码	236
结束页码	247
卷号	519
英文摘要	Like microbialites, microbially induced sedimentary structures (MISSs) are commonly observed in siliciclastic and mixed carbonate siliciclastic settings in the Lower Triassic, and are represented by several morphological types including wrinkle structures. However, their origin and their role in the Early Triassic ecosystem recovery is currently a hot topic of debate. Herein we report and describe abundant wrinkle structures from the Smithian Kockatea Shale Formation of Northampton area in the Perth Basin, Western Australia, on the basis of detailed field observations as well as petrographic and SEM examinations of rock thin sections. The surficial morphologies of wrinkles are characterized by closely spaced crests and ridges on the upper bedding surfaces, together with other forms such as pitted bulges and reticulated ridges. Detailed petrologic analysis revealed that the Smithian wrinkle structures from the northern Perth Basin possess a distinct vertical profile: (1) cross-stratified/lamianted sandstone, (2) alternating laminated layers and sandstone, (3) laminated layers, and (4) wrinkled layers, in an ascending order. The wrinkled layers are overlain by thin shale. Laminated layers beneath wrinkled surfaces comprise densely packed, pronounced, wavy laminae. Mica flakes in laminations show a preferred alignment parallel to bedding under SEM imaging, suggesting the binding and trapping of the former presence of a microbial matground. These evidences support that the Early Triassic wrinkle structures from the Smithian Kockatea Formation are biogenic in origin. Close association of both trace and body fossils with the wrinkle structure-bearing layers is interpreted to indicate the presence of a matground ecosystem in which some small gastropods and various trace-making animals lived, possibly taking the habitat as a refuge. The global temporal and spatial occurrences of Early Triassic MISS were tabulated and analyzed, revealing a wide range of palaeoenvironmental distributions and the seemingly selected association between metazoans and certain MISS. As to why only some MISSs have been found together with metazoans remains as an open question. It will require further investigation especially with regard to the specific type of microbes that had built the microbial matground ecosystems and their interplay with the hosted metazoans in the aftermath of the end-Permian mass extinction. © 2018
英文关键词	Biogenicity; Biotic recovery; Eastern Gondwana; Matground habitat; Trace fossil; Wrinkle structure
语种	英语
scopus关键词	biogenic material; gastropod; Gondwana; habitat; microbial activity; microbial mat; microbialite; paleoenvironment; sedimentary petrology; sedimentary structure; siliciclastic deposit; trace fossil; Triassic; Australia; England; Northampton; Northamptonshire; Perth Basin; United Kingdom; Western Australia; Animalia; Gastropoda; Metazoa
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151040
作者单位	Deakin University, Geelong, Australia, School of Life and Environmental Sciences, Melbourne Burwood Campus. 221, Burwood Highway, Burwood, Victoria 3125, Australia; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan, 430074, China; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Wuhan), Wuhan, 430074, China
推荐引用方式 GB/T 7714	Luo M.,Chen Z.-Q.,Shi G.R.,et al. Microbially induced sedimentary structures (MISSs) from the Lower Triassic Kockatea Formation; northern Perth Basin; Western Australia: Palaeoenvironmental implications[J],2019,519.
APA	Luo M..,Chen Z.-Q..,Shi G.R..,Feng X..,Yang H..,...&Li Y..(2019).Microbially induced sedimentary structures (MISSs) from the Lower Triassic Kockatea Formation; northern Perth Basin; Western Australia: Palaeoenvironmental implications.Palaeogeography, Palaeoclimatology, Palaeoecology,519.
MLA	Luo M.,et al."Microbially induced sedimentary structures (MISSs) from the Lower Triassic Kockatea Formation; northern Perth Basin; Western Australia: Palaeoenvironmental implications".Palaeogeography, Palaeoclimatology, Palaeoecology 519(2019).