气候变化领域集成服务门户(CCPortal): Stacked Parahaentzschelinia ichnofabrics from the Lower Permian of the southern Sydney Basin; southeastern Australia: Palaeoecologic and palaeoenvironmental significance

CCPortal

DOI	10.1016/j.palaeo.2019.109538
	Stacked Parahaentzschelinia ichnofabrics from the Lower Permian of the southern Sydney Basin; southeastern Australia: Palaeoecologic and palaeoenvironmental significance
	Luo M.; Shi G.R.; Lee S.
发表日期	2020
ISSN	0031-0182
卷号	541
英文摘要	Trace fossils are sensitive indicators for environmental parameters (e.g., hydrodynamics, oxygen content, water depth, depositional rates, salinity), providing invaluable information to understand past depositional regimes not attainable from other sources of approaches. Here we report a new trace fossil assemblage dominated by a potential bivalve trace Parahaentzschelinia from the Lower Permian Snapper Point Formation, which records deposition in a storm-influenced delta front environment. Dense populations of Parahaentzschelinia occurred in two sections, forming stacked Parahaentzschelinia ichnofabrics and representing multiple burrow adjustments of a single trace maker (tellinid bivalve) subsequent to rapid sedimentation events caused by possible seasonal/annual runoffs. Statistical analysis of burrow lengths and numbers of adjustments suggests up to seven sequences of sediment accumulation events, supplying 3–13 cm thick clastic deposits at each time. A conservative sedimentation rate of 0.24 cm/year was estimated on the basis of two stacked Parahaentzschelinia ichnofabrics and the probable maximum lifespan of the modern tellinid genus. This rate is generally comparable to those derived from modern deltaic environments, lending further support to the interpretation that the ichnofabrics were formed in and characteristic of a deltaic setting. Our research highlights the utility of stacked equilibrium structures as a sensitive indicator of certain depositional regimes, and its applicability for assessing sedimentation rates as well as depositional conditions in the geological past. © 2019 Elsevier B.V.
英文关键词	Eastern Gondwana; Glaciomarine; Snapper Point Formation; Tellinid bivalve; Trace fossil
语种	英语
scopus关键词	bivalve; burrow; fossil assemblage; glaciomarine deposit; Gondwana; ichnofabric; Permian; sedimentation rate; trace fossil; Australia; New South Wales; Sydney Basin; Bivalvia; Tellinidae
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/150615
作者单位	State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Center for Excellence in Life and Palaeoenvironment, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing, 210008, China; School of Earth, Atmospheric and Life Sciences, University of Wollongong, Northfields AveNSW 2522, Australia
推荐引用方式 GB/T 7714	Luo M.,Shi G.R.,Lee S.. Stacked Parahaentzschelinia ichnofabrics from the Lower Permian of the southern Sydney Basin; southeastern Australia: Palaeoecologic and palaeoenvironmental significance[J],2020,541.
APA	Luo M.,Shi G.R.,&Lee S..(2020).Stacked Parahaentzschelinia ichnofabrics from the Lower Permian of the southern Sydney Basin; southeastern Australia: Palaeoecologic and palaeoenvironmental significance.Palaeogeography, Palaeoclimatology, Palaeoecology,541.
MLA	Luo M.,et al."Stacked Parahaentzschelinia ichnofabrics from the Lower Permian of the southern Sydney Basin; southeastern Australia: Palaeoecologic and palaeoenvironmental significance".Palaeogeography, Palaeoclimatology, Palaeoecology 541(2020).