干旱区生态环境知识资源中心(Arid): Early-Middle Devonian paleosols and palustrine beds of NW Canada in the context of land plant evolution and global spreads of anoxia

Arid

DOI	10.1016/j.gloplacha.2021.103573
	Early-Middle Devonian paleosols and palustrine beds of NW Canada in the context of land plant evolution and global spreads of anoxia
	Kabanov, P.
通讯作者	Kabanov, P (corresponding author), Geol Survey Canada, Nat Resources Canada, Calgary, AB T2L 2A7, Canada.
来源期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
EISSN	1872-6364
出版年	2021
卷号	204
英文摘要	Dozens of subaerial exposure surfaces are assessed in cores from cyclic peritidal carbonates of the Emsian-Eifelian (similar to 410-385 Ma) age. These surfaces range from incipient erosional surfaces to paleokarst profiles and thick (>1 m) calcretic-clayey paleosols. Palustrine carbonates intervening at multiple levels in same strata are the earliest known occurrence of a typical palustrine facies in a coastal carbonate plain environment. None of paleokarst and paleosol profiles contain traces of vascular-plant root penetration, and only palustrine facies exhibit swarms of thin rhizoliths. These findings are within the context of Devonian paleosols on marine carbonate substrates where root traces and laminar calcretes are extremely rare (only 2 reports), and no instances of root penetrations are trackable from unconformities in pre-Givetian carbonate successions. The delta C-13 and delta O-18 signatures indicate variable diagenetic reset of isotopic composition. Modest delta C-13(vpdb) offset towards lighter values is preserved in two thicker paleosols (-3.4 to -8.0 parts per thousand in calcretic matrix vs. -1.35 to -6.5 parts per thousand in parent limestone). Such offsets are very rare in pre-Late Devonian pedogenic carbonates, and their attribution to plant-derived CO2 is dubious. It is inferred that the land surface in calcimagnesian landscapes remained a regolith or primary desert (i.e., was never colonized by tracheophytes) long after the spread of vascular plants in more favorable wetland settings. Furthermore, the advent of seed reproductive strategy in the latest Devonian and plant adaptations to aridic habitats manifesting in fossil floras only since Pennsylvanian indicate that much of land surface remained within the realm of primary desert long after the afforestation of wetlands. The direct (plant roots, shoots and spores) and indirect (sedimentary features) fossil records of land greening during the Paleozoic are not corroborating the hypothesis holding the primordial embryophytic cover on land accountable for the Late Ordovician atmospheric oxygenation-decarbonization event. It is further argued that the evolution of root systems and plant stature could hardly trigger anoxic events and biotic crises in the Devonian marine realm.
英文关键词	Paleosol Shallow-marine carbonate Palustrine carbonate Root traces Plant evolution Early-Middle Paleozoic Earth
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000684566000001
WOS关键词	OLD RED SANDSTONE ; LARGE IGNEOUS PROVINCES ; WOOD BAY FORMATION ; HORN RIVER GROUP ; CRYPTOGAMIC COVERS ; APPALACHIAN BASIN ; ATMOSPHERIC CO2 ; BLACK SHALES ; NEW-YORK ; CARBONATE
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363449
作者单位	[Kabanov, P.] Geol Survey Canada, Nat Resources Canada, Calgary, AB T2L 2A7, Canada
推荐引用方式 GB/T 7714	Kabanov, P.. Early-Middle Devonian paleosols and palustrine beds of NW Canada in the context of land plant evolution and global spreads of anoxia[J],2021,204.
APA	Kabanov, P..(2021).Early-Middle Devonian paleosols and palustrine beds of NW Canada in the context of land plant evolution and global spreads of anoxia.GLOBAL AND PLANETARY CHANGE,204.
MLA	Kabanov, P.."Early-Middle Devonian paleosols and palustrine beds of NW Canada in the context of land plant evolution and global spreads of anoxia".GLOBAL AND PLANETARY CHANGE 204(2021).

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