气候变化领域集成服务门户(CCPortal): Tidal circulation in an Early Permian epicontinental sea: Evidence of an amphidromic system

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DOI	10.1016/j.palaeo.2020.109671
	Tidal circulation in an Early Permian epicontinental sea: Evidence of an amphidromic system
	Candido M.; Cagliari J.; Lavina E.L.
发表日期	2020
ISSN	0031-0182
卷号	546
英文摘要	In epicontinental seas, as well as in oceans, amphidromic systems control tidal movement, acting on coastal dynamics and, therefore, influencing the depositional record. Inland seas were common in Pangea during the Permian. However, estimating the conditions that governed the tide in these seas is highly complex. Although Permian marine deposits are well documented on a regional scale, the tidal behavior in the epicontinental sea has not been analyzed yet. In this work, we present a theoretical perspective on the behavior of tides in the epicontinental sea of the Paraná Basin during the Early Permian (Guatá Sea), covering an area of ~1200,000 km2. Mathematical models were applied to test the existence of amphidromic points in the basin (determined from the Rossby radius of deformation) as well as to verify the possibility of resonance. Since paleodepth is unknown and the basin tectonism is still under discussion, an estimated bathymetry from 20 to 500 m was used to cover even some unlikely scenarios. We also tested, using mathematical models, the amplification of the tide inside two paleovalleys. The obtained results were compared to Hudson Bay, considered here to be a modern analog of the Guatá Sea. According to the paleogeography, paleolatitude (Southern Hemisphere), and depositional records, the Guatá Sea had clockwise-rotation amphidromic systems. However, resonant effects may also have affected circulation, especially at sea depth below 100 m. In the simulated scenarios, the tide amplification in both valleys was variable but concentrated between micro to mesotidal amplitudes. This study presents the first contribution to the understanding of the tidal behavior of the Early Permian epicontinental sea of the Paraná Basin in the basinal context of the Gondwanan paleocontinent. Recognition of amphidromic circulation in an inland sea is important because it may help to explain the general behavior of tidal deposits recorded in the basin, which were built and reworked under the influence of this system. © 2020 Elsevier B.V.
英文关键词	Gondwana; Guatá Sea; Rio Bonito Formation; Tidal behavior
语种	英语
scopus关键词	bathymetry; circulation; Gondwana; inland sea; Paleozoic; Permian; tidal current; Canada; Hudson Bay; Katsuwonus pelamis
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/150543
作者单位	Programa de Pós-Graduação em Geologia, Universidade do Vale do Rio dos Sinos, Av. Unisinos, 950, Cristo Rei, São Leopoldo, Rio Grande do Sul CEP 93022-000, Brazil
推荐引用方式 GB/T 7714	Candido M.,Cagliari J.,Lavina E.L.. Tidal circulation in an Early Permian epicontinental sea: Evidence of an amphidromic system[J],2020,546.
APA	Candido M.,Cagliari J.,&Lavina E.L..(2020).Tidal circulation in an Early Permian epicontinental sea: Evidence of an amphidromic system.Palaeogeography, Palaeoclimatology, Palaeoecology,546.
MLA	Candido M.,et al."Tidal circulation in an Early Permian epicontinental sea: Evidence of an amphidromic system".Palaeogeography, Palaeoclimatology, Palaeoecology 546(2020).