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DOI	10.1016/j.palaeo.2019.109544
	When does large woody debris influence ancient rivers? Dendrochronology applications in the Permian and Triassic; Antarctica
	Gulbranson E.L.; Cornamusini G.; Ryberg P.E.; Corti V.
发表日期	2020
ISSN	0031-0182
卷号	541
英文摘要	Accumulations of woody debris and in situ forests in and near ancient river systems are studied in Permian through Triassic strata of Antarctica. These Permian and Triassic fossil ecosystems represent paleo-polar and paleo-high-latitude environments, respectively, and therefore represent unique ecosystem end-members for assessing the role of woody debris in influencing fluvial deposition and paleoecologic processes. A new application of dendrochronology, the cross-dating of ring widths from individual trees, is applied to these fossil woods to develop a chronology of wood growth in the transported woody debris relative to in situ stumps. Cross-matching of woody debris relative to in situ stumps for the Permian indicates that woody debris deposition in river channels was contemporaneous with the development of vegetated macroforms in in-channel fluvial deposits. In contrast, Triassic woody debris occurs without evidence of vegetated in-channel macroforms, yet the volume and areal distribution of woody debris is greater than that measured in the Permian. Floral diversity increased dramatically across the Permian–Triassic transition in Antarctica, in addition to an increase in tree density in Triassic forests relative to Permian forests. However, these observations do not clearly explain the difference between the woody debris influence on Permian river systems relative to Triassic river systems. Paleoclimate simulations, however, indicate that the Permian polar environment was in surplus of water during the austral summer relative to the Triassic, consistent with paleosol morphology, suggesting that paleoclimate variation exerted a prominent control on vegetation-river dynamics. © 2019 Elsevier B.V.
语种	英语
scopus关键词	accumulation; dendrochronology; fluvial deposit; fossil record; paleoclimate; paleoecology; paleoenvironment; paleosol; Permian; river system; tree ring; Triassic; Antarctica
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/150613
作者单位	Department of Geology, Gustavus Adolphus College56082, United States; Dipartimento di Scienze Fisiche, della Terra e dell'Ambiente, Università di Siena, Italy; Department of Natural and Physical Sciences, Park University64152, United States
推荐引用方式 GB/T 7714	Gulbranson E.L.,Cornamusini G.,Ryberg P.E.,et al. When does large woody debris influence ancient rivers? Dendrochronology applications in the Permian and Triassic; Antarctica[J],2020,541.
APA	Gulbranson E.L.,Cornamusini G.,Ryberg P.E.,&Corti V..(2020).When does large woody debris influence ancient rivers? Dendrochronology applications in the Permian and Triassic; Antarctica.Palaeogeography, Palaeoclimatology, Palaeoecology,541.
MLA	Gulbranson E.L.,et al."When does large woody debris influence ancient rivers? Dendrochronology applications in the Permian and Triassic; Antarctica".Palaeogeography, Palaeoclimatology, Palaeoecology 541(2020).