干旱区生态环境知识资源中心(Arid): Elevated sedimentation of clastic matter in pelagic Panthalassa during the early Olenekian

Arid

DOI	10.1111/iar.12485
	Elevated sedimentation of clastic matter in pelagic Panthalassa during the early Olenekian
	Muto, Shun; Takahashi, Satoshi; Yamakita, Satoshi
通讯作者	Muto, S
来源期刊	ISLAND ARC
ISSN	1038-4871
EISSN	1440-1738
出版年	2023
卷号	32 期号:1
英文摘要	The end-Permian mass extinction is thought to have greatly altered biogeochemical cycles. The absence of chert and dominance of claystone in low-latitude pelagic deep-sea sedimentary sequences of Early Triassic Panthalassa (the deep-sea chert gap) has been believed to record radiolarian die-off and consequent decline in biogenic silica production. However, recent studies showed that the upper portion of the deep-sea chert gap has sedimentation rates higher than bedded chert, meaning that increased clastic inputs, rather than decreased biogenic silica inputs, resulted in the anomalous lithology. In this study, we focus on the Akkamori-2 section, which preserves a rare sedimentary sequence spanning a large part of the lower portion of the claystone of the deep-sea chert gap. We obtained conodont fossils that allow correlation with sections in South China that have numerous dated tuffs. By projecting the dates of the tuffs to our measured sections, we show that sedimentation rates of the lower portion of the deep-sea chert gap is also higher than bedded chert. Hence, most of the deep-sea chert gap was formed under increased clastic inputs, which likely records disturbance in the terrestrial landscape, probably aridification and/or increased seasonality in arid areas, that lead to elevated dust flux to the pelagic ocean. On the other hand, the idea that the deep-sea chert gap records lingering effects of the mass extinction event on radiolarians cannot explain the high sedimentation rates of the deep-sea chert gap. This previously favored scenario needs to be reconsidered, taking into account the burial efficiency of biogenic silica in the Early Triassic ocean, and also effects of increased clay deposition on preservation of radiolarians.
英文关键词	chert gap conodont end-Permian mass extinction Jurassic accretionary complex linear sedimentation rate Smithian
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000982174000001
WOS关键词	MULTIELEMENT CONODONT APPARATUSES ; EARLY TRIASSIC CONODONTS ; DEEP-SEA ; NANPANJIANG BASIN ; BOUNDARY ; SOUTH ; BIOSTRATIGRAPHY ; PROVINCE ; SECTION ; RECORD
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397076
推荐引用方式 GB/T 7714	Muto, Shun,Takahashi, Satoshi,Yamakita, Satoshi. Elevated sedimentation of clastic matter in pelagic Panthalassa during the early Olenekian[J],2023,32(1).
APA	Muto, Shun,Takahashi, Satoshi,&Yamakita, Satoshi.(2023).Elevated sedimentation of clastic matter in pelagic Panthalassa during the early Olenekian.ISLAND ARC,32(1).
MLA	Muto, Shun,et al."Elevated sedimentation of clastic matter in pelagic Panthalassa during the early Olenekian".ISLAND ARC 32.1(2023).