气候变化领域集成服务门户(CCPortal): Criteria for differentiating microbial-caddisfly bioherms from those of marine polychaetes in a lacustrine setting: Paleocene second member; Funing Formation; Subei Basin; East China

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DOI	10.1016/j.palaeo.2020.109974
	Criteria for differentiating microbial-caddisfly bioherms from those of marine polychaetes in a lacustrine setting: Paleocene second member; Funing Formation; Subei Basin; East China
	Zhou X.; Jiang Z.; MacEachern J.A.
发表日期	2020
ISSN	0031-0182
卷号	560
英文摘要	Paleogene carbonate successions from lacustrine basins across East China yield microbial bioherms containing abundant agglutinated fossil tubes. Historically, these have been interpreted as the dwellings of polychaetes introduced by marine incursions. This is problematic, because these tubes are associated with abundant non-marine fauna and algae. Diverse and exceptionally well-preserved fossil tubes from carbonate microbial bioherms were studied in outcrops and drill cores of the second member of the Paleocene Funing Formation, Subei Basin, East China. Detailed macro-, meso-, and micro-structural investigations of these tube-dominated bioherms reveal that the putative “marine polychaete tubes” better fit the morphologies and construction styles of lacustrine caddisfly (Insecta: Trichoptera) larval cases, eliminating the need for a marine influence on this lacustrine setting. Individual caddisfly cases are commonly 10–25 mm in length and 1–2.5 mm in diameter, and form slightly curved, tapered tubes or coiled spirals. Twelve tubular case construction styles were further identified, based on caddisfly-case wall structures and dominant grain types. Caddisfly cases are commonly single-walled, with rarer nested instar cases comprising double- or triple-walls of different sizes. Most cases are fully agglutinated with neatly arranged, similarly sized and closely connected particles of clastic grains, carbonate particles, plant fragments, and phosphatic fish bones. Sparsely agglutinated cases are also present but much rarer, and conform to the silk larval cases of caddisflies. The caddisfly cases appear as gregarious aggregations within carbonate microbial-bioherms. The microbial-caddisfly bioherms in this study are commonly developed on carbonate hardground or mudstone within the wave-washed, high-energy, shallow-lacustrine littoral zone and can be traced along the western paleolake margin of the Jinhu Depression of the Subei Basin for up to 60 km. The bioherms are composed of repeated microbial-caddisfly couplets, made up of randomly arranged and similarly sized caddisfly cases encrusted by domed, planar, columnar or cauliflower-like microbial layers. Cyclic microbial-caddisfly couplets fit well with caddisfly biology but are not known to occur with marine polychaetes. This is the first report of microbial-caddisfly bioherms in Cenozoic strata of China, and is the oldest Cenozoic record of caddisflies in China. © 2020 Elsevier B.V.
英文关键词	Agglutinated polychaete tubes; Helix-shaped cases; Marine incursion; Nested instar cases; Silk larval cases; Trichopteran cases
语种	英语
scopus关键词	bioherm; caddisfly; fossil record; historical record; intertidal environment; lacustrine deposit; marine ecosystem; microbial activity; Paleocene; paleoenvironment; polychaete; China; Jiangsu; Jinhu Sag; Subei Basin; algae; Brassica oleracea var. botrytis; Insecta; Polychaeta; Trichoptera
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/150316
作者单位	School of Energy Resources, China University of Geosciences (Beijing), Beijing, 100083, China; Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, China University of Geosciences (Beijing), Beijing, 100083, China; Applied Research in Ichnology and Sedimentology (ARISE) Group, Department of Earth Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada
推荐引用方式 GB/T 7714	Zhou X.,Jiang Z.,MacEachern J.A.. Criteria for differentiating microbial-caddisfly bioherms from those of marine polychaetes in a lacustrine setting: Paleocene second member; Funing Formation; Subei Basin; East China[J],2020,560.
APA	Zhou X.,Jiang Z.,&MacEachern J.A..(2020).Criteria for differentiating microbial-caddisfly bioherms from those of marine polychaetes in a lacustrine setting: Paleocene second member; Funing Formation; Subei Basin; East China.Palaeogeography, Palaeoclimatology, Palaeoecology,560.
MLA	Zhou X.,et al."Criteria for differentiating microbial-caddisfly bioherms from those of marine polychaetes in a lacustrine setting: Paleocene second member; Funing Formation; Subei Basin; East China".Palaeogeography, Palaeoclimatology, Palaeoecology 560(2020).