干旱区生态环境知识资源中心(Arid): Deadly oasis: Recurrent annihilation of Cretaceous desert bryophyte colonies; the role of solar, climate and lithospheric forcing

Arid

DOI	10.1016/j.gsf.2020.06.008
	Deadly oasis: Recurrent annihilation of Cretaceous desert bryophyte colonies; the role of solar, climate and lithospheric forcing
	Pedro Rodriguez-Lopez, Juan; Barron, Eduardo; Peyrot, Daniel; Hughes, Gary B.
通讯作者	Rodriguez-Lopez, JP
来源期刊	GEOSCIENCE FRONTIERS
ISSN	1674-9871
出版年	2021
卷号	12 期号:1 页码:1-12
英文摘要	Many oases (wet interdunes) are sedimentary systems characterized by high-frequency water-level oscillations, marked changes in salinity and intense biological activity a their margins. They are considered to be one of the most challenging environments on Earth for ecosystem development. These dynamic, depositional settings are usually unfavourable for fossilization and subsequent preservation of vegetal remains. This paper describes bryophyte (liverwort) assemblages occurring in three successive horizons interpreted to represent (i) recurrent early successional phases of biological soil crust colonization of wet interdune margins or (ii) exceptional preservation of floating or riparian liverworts in oasis pond waters associated with a progressive fall of the interdune water level. The record of in situ colonization surfaces characterized by delicate (e.g. lignin-free) three-dimensional structures represents an exceptional type of preservation herein associated with a rapid variation in phreatic interdune water level and the subsequent establishment of anoxic and reducing conditions. The occurrence of exceptionally preserved liverwort colonies coincides with the sedimentary record of, at least, three seismite levels in the oasis. Data gathered from the site suggests that the water table of the oasis was controlled by a combination of (i) a positive creation of accommodation space due to subsidence associated with movement on syn-sedimentary extensional faults, and (ii) the rise and fall of the oasis water table controlled by the oscillations of the groundwater system due to orbital changes which appear to drive the variability of the climate system. Rising groundwater levels flooded the oasis soil crusts and lead to the exceptional recurrent preservation of liverwort colonies at the oasis margins. Alternatively, considering the hypothesis of floating or riparian liverworts in the oasis pond waters, the fall in the level of the oasis water table placed the floating liverworts in contact with the oasis bottom sediments. This fall in the level of the oasis water table could indicate a cessation of accommodation space by syn-sedimentary extensional faults and/or a regional lowering of the groundwater system level associated with drought periods. Preliminary results indicate that oasis lamination between liverwort colonies records decadal and sub-decadal cyclicity, related with 11-year Schwabe sunspot and sub-decadal NAO cyclicities, conferring for every sedimentary cycle between liverwort colonies a duration of approximately 200 years, that otherwise matches the expected recurrence period for the De Vries cycle of solar activity.
英文关键词	Oasis Cretaceous Liverworts Colonies Extensional tectonics Solar cyclicity
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:000597401000001
WOS关键词	BIOLOGICAL SOIL CRUSTS ; SOFT-SEDIMENT DEFORMATION ; ERG-MARGIN SYSTEM ; ESCUCHA FORMATION ; OLIETE SUBBASIN ; INTERDUNE DEPOSITS ; CYCLE ; VARIABILITY ; SANDSTONE ; FREQUENCY
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	University of Western Australia
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/328058
作者单位	[Pedro Rodriguez-Lopez, Juan] United Arab Emirates Univ, Dept Geol, Fac Sci, Abu Dhabi 50009, U Arab Emirates; [Barron, Eduardo] Inst Geol & Minero Espana IGME, Rios Rosas 23, E-28003 Madrid, Spain; [Peyrot, Daniel] Univ Western Australia, Sch Earth & Environm, Crawley, WA 6101, Australia; [Peyrot, Daniel] Univ Western Australia, Ctr Energy Geosci, Crawley, WA 6101, Australia; [Hughes, Gary B.] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA; [Pedro Rodriguez-Lopez, Juan] Calle Mascaraque 48,2A, Madrid 28044, Spain
推荐引用方式 GB/T 7714	Pedro Rodriguez-Lopez, Juan,Barron, Eduardo,Peyrot, Daniel,et al. Deadly oasis: Recurrent annihilation of Cretaceous desert bryophyte colonies; the role of solar, climate and lithospheric forcing[J]. University of Western Australia,2021,12(1):1-12.
APA	Pedro Rodriguez-Lopez, Juan,Barron, Eduardo,Peyrot, Daniel,&Hughes, Gary B..(2021).Deadly oasis: Recurrent annihilation of Cretaceous desert bryophyte colonies; the role of solar, climate and lithospheric forcing.GEOSCIENCE FRONTIERS,12(1),1-12.
MLA	Pedro Rodriguez-Lopez, Juan,et al."Deadly oasis: Recurrent annihilation of Cretaceous desert bryophyte colonies; the role of solar, climate and lithospheric forcing".GEOSCIENCE FRONTIERS 12.1(2021):1-12.