气候变化领域集成服务门户(CCPortal): The Sirius Passet Lagerstätte of North Greenland—A geochemical window on early Cambrian low-oxygen environments and ecosystems

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DOI	10.1111/gbi.12315
	The Sirius Passet Lagerstätte of North Greenland—A geochemical window on early Cambrian low-oxygen environments and ecosystems
	Hammarlund E.U.; Smith M.P.; Rasmussen J.A.; Nielsen A.T.; Canfield D.E.; Harper D.A.T.
发表日期	2019
ISSN	14724677
起始页码	12
结束页码	26
卷号	17 期号:1
英文摘要	The early Cambrian Sirius Passet fauna of northernmost Greenland (Cambrian Series 2, Stage 3) contains exceptionally preserved soft tissues that provide an important window to early animal evolution, while the surrounding sediment holds critical data on the palaeodepositional water-column chemistry. The present study combines palaeontological data with a multiproxy geochemical approach based on samples collected in situ at high stratigraphic resolution from Sirius Passet. After careful consideration of chemical alterations during burial, our results demonstrate that fossil preservation and biodiversity show significant correlation with iron enrichments (Fe HR /Fe T ), trace metal behaviour (V/Al), and changes in nitrogen cycling (δ 15 N). These data, together with Mo/Al and the preservation of organic carbon (TOC), are consistent with a water column that was transiently low in oxygen concentration, or even intermittently anoxic. When compared with the biogeochemical characteristics of modern oxygen minimum zones (OMZs), geochemical and palaeontological data collectively suggest that oxygen concentrations as low as 0.2–0.4 ml/L restricted bioturbation but not the development of a largely nektobenthic community of predators and scavengers. We envisage for the Sirius Passet biota a depositional setting where anoxic water column conditions developed and passed over the depositional site, possibly in association with sea-level change, and where this early Cambrian biota was established in conditions with very low oxygen. © 2018 The Authors. Geobiology Published by John Wiley & Sons Ltd
关键词	benthos biodiversity biogeochemistry Cambrian concentration (composition)lagerstatte nekton oxygen minimum layer paleontology sea level change soft tissue preservation water column Arctic Greenland Animalia oxygen sea water chemistry ecosystem evolution fossil Greenland sea sediment Biological Evolution Ecosystem Fossils Geologic Sediments Greenland Oceans and Seas Oxygen Seawater
语种	英语
来源机构	Geobiology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133255
推荐引用方式 GB/T 7714	Hammarlund E.U.,Smith M.P.,Rasmussen J.A.,等. The Sirius Passet Lagerstätte of North Greenland—A geochemical window on early Cambrian low-oxygen environments and ecosystems[J]. Geobiology,2019,17(1).
APA	Hammarlund E.U.,Smith M.P.,Rasmussen J.A.,Nielsen A.T.,Canfield D.E.,&Harper D.A.T..(2019).The Sirius Passet Lagerstätte of North Greenland—A geochemical window on early Cambrian low-oxygen environments and ecosystems.,17(1).
MLA	Hammarlund E.U.,et al."The Sirius Passet Lagerstätte of North Greenland—A geochemical window on early Cambrian low-oxygen environments and ecosystems".17.1(2019).