干旱区生态环境知识资源中心(Arid): Stratigraphic Architecture of the Karoo River Channels at the End-Capitanian

Arid

DOI	10.3389/feart.2020.521766
	Stratigraphic Architecture of the Karoo River Channels at the End-Capitanian
	Bordy, Emese M.; Paiva, Francisco
通讯作者	Bordy, EM (corresponding author), Univ Cape Town, Dept Geol Sci, Cape Town, South Africa.
来源期刊	FRONTIERS IN EARTH SCIENCE
EISSN	2296-6463
出版年	2021
卷号	8
英文摘要	The main Karoo Basin of southern Africa contains the continental record of the end-Triassic, end-Permian, and end-Capitanian mass extinction events. Of these, the environmental drivers of the end-Capitanian are least known. Integrating quantitative stratigraphic architecture analysis from abundant outcrop profiles, paleocurrent measurements, and petrography, this study investigates the stratigraphic interval that records the end-Capitanian extinction event in the southwestern and southern main Karoo Basin and demonstrates that this biotic change coincided with a subtle variation in the stratigraphic architectural style similar to 260 Ma ago. Our multi-proxy sedimentological work not only defines the depositional setting of the succession as a megafan system that drained the foothills of the Cape Fold Belt, but also attempts to differentiate the tectonic and climatic controls on the fluvial architecture of this paleontologically important Permian succession. Our results reveal limited changes in sediment sources, paleocurrents, sandstone body geometries, and possibly a constant hot, semi-arid paleoclimate during the deposition of the studied interval; however, the stratigraphic trends show upward increase in 1) laterally accreted, sandy architectural elements and 2) architectural elements that build a portion of the floodplain deposits. We consider this to reflect a long-term retrogradational stacking pattern of facies composition that can be linked to changes on the medial parts of southward draining megafans, where channel sinuosity increased, and depositional energy decreased at the end-Capitanian. The shift in the fluvial architecture was likely triggered by basin-wide allogenic controls rather than local autogenic processes because this trend is observed in the coeval stratigraphic intervals from geographically disparate areas in the southwestern and southern main Karoo Basin. Consequently, we propose that this regional backstepping most likely resulted from tectonic events in the adjacent Cape Fold Belt.
英文关键词	Permian megafans tectonic control main Karoo Basin paleocurrent patterns end-Capitanian fluvial facies architecture quantitative stratigraphy
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000623325300001
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/2XILL650/369011
作者单位	[Bordy, Emese M.; Paiva, Francisco] Univ Cape Town, Dept Geol Sci, Cape Town, South Africa
推荐引用方式 GB/T 7714	Bordy, Emese M.,Paiva, Francisco. Stratigraphic Architecture of the Karoo River Channels at the End-Capitanian[J],2021,8.
APA	Bordy, Emese M.,&Paiva, Francisco.(2021).Stratigraphic Architecture of the Karoo River Channels at the End-Capitanian.FRONTIERS IN EARTH SCIENCE,8.
MLA	Bordy, Emese M.,et al."Stratigraphic Architecture of the Karoo River Channels at the End-Capitanian".FRONTIERS IN EARTH SCIENCE 8(2021).