干旱区生态环境知识资源中心(Arid): Silt-sized sediments and gypsum on surface formations in the Ebro Basin: a disambiguation of the term gypsiferous silts

Arid

DOI	10.1344/GeologicaActa2021.19.8
	Silt-sized sediments and gypsum on surface formations in the Ebro Basin: a disambiguation of the term gypsiferous silts
	Poch, Rosa M.; Rodriguez-Ochoa, Rafael; Artieda, Octavio; Carles Balasch, J.; Boixadera, Jaume
通讯作者	Poch, RM (corresponding author), Univ Lleida, Dept Medi Ambient & Ciencies Sol, Av Rovira Roure 191, Lleida 25198, Spain.
来源期刊	GEOLOGICA ACTA
ISSN	1695-6133
EISSN	1696-5728
出版年	2021
卷号	19
英文摘要	The term gypsiferous silts has been used since the 1960s by many authors, but it has relied on unclear, ambiguous criteria that attributed aeolian, colluvial or alluvial origins to these materials. The aim of this paper is to clarify the use of the term gypsiferous silts applied to silt-sized, gypsum-bearing sediments on surface formations in the Ebro Basin, using published and unpublished information. We distinguished three types of materials with very different characteristics that had all been attributed to the general term gypsiferous silts in previously published work: i) gypsiferous silts sensu stricto, ii) loess and iii) flour-like gypsum. The recommendations of our study are that the first two terms should be applied to gypsum-containing sediments located in varied topographic positions with calcium carbonate contents up to 40-50% and coarse silty to fine sandy textures. Loess normally appears as thick outcrops (up to 12m) on slopes leeward from the main wind direction, with a limited pedogenesis consisting of a partial carbonate mobilisation and gypsum contents between 0 and 30%. Loess is the only category with an aeolian origin. The materials in the category gypsiferous silts sensu stricto are mainly colluvial-alluvial. The third term (flour-like gypsum) should be used to refer to materials on surface formations consisting of almost 100% silt- to fine sand size lenticular gypsum. These materials derive from on-site weathering of gyprock or by precipitation from calcium- and sulphate-saturated groundwater and surficial waters and show a variable spatial distribution: along footslopes, outcropping as metric surface formations, interstratified between limestone layers or as generalized karstified subsurface accumulations. The proposed classification, based on morphological and physico-chemical characteristics, establishes a necessary distinction among the three types of materials, since they differ in their properties and geotechnical behaviour relevant for soil management and land use. Using the proposed classification will allow their distinct characteristics can be taken into account when performing geological or soil surveys in this and similar arid regions.
英文关键词	weathering micromorphology pedogenesis gypsiferous soils loess
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000717139400004
WOS关键词	PLEISTOCENE EXAMPLE ; LOESS ; ACCUMULATION ; DEPRESSION ; SOILS ; CLASSIFICATION ; SUBSIDENCE ; SYSTEMS ; SPAIN
WOS类目	Geology
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/2XILL650/369052
作者单位	[Poch, Rosa M.; Rodriguez-Ochoa, Rafael; Carles Balasch, J.; Boixadera, Jaume] Univ Lleida, Dept Medi Ambient & Ciencies Sol, Av Rovira Roure 191, Lleida 25198, Spain; [Artieda, Octavio] Univ Extremadura, Dept Biol Vegetal Ecol & Ciencias Tier IACYS, Av Virgen Puerto 2, Plasencia 10600, Spain; [Boixadera, Jaume] Generalitat Catalunya, Dept Agr Ramaderia Pesca & Alimentacio, Av Rovira Roure 191, Lleida 25198, Spain
推荐引用方式 GB/T 7714	Poch, Rosa M.,Rodriguez-Ochoa, Rafael,Artieda, Octavio,et al. Silt-sized sediments and gypsum on surface formations in the Ebro Basin: a disambiguation of the term gypsiferous silts[J],2021,19.
APA	Poch, Rosa M.,Rodriguez-Ochoa, Rafael,Artieda, Octavio,Carles Balasch, J.,&Boixadera, Jaume.(2021).Silt-sized sediments and gypsum on surface formations in the Ebro Basin: a disambiguation of the term gypsiferous silts.GEOLOGICA ACTA,19.
MLA	Poch, Rosa M.,et al."Silt-sized sediments and gypsum on surface formations in the Ebro Basin: a disambiguation of the term gypsiferous silts".GEOLOGICA ACTA 19(2021).