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DOI	10.1016/j.sedgeo.2020.105793
	Precipitation of kerolite and sepiolite associated with Mg-rich carbonates in a cave environment
	Martin-Perez, Andrea; La Iglesia, Angel; Almendros, Gonzalo; Antonio Gonzalez-Perez, Jose; Alonso-Zarza, Ana Maria
通讯作者	Martin-Perez, A (corresponding author), Slovenian Acad Sci & Arts, Ivan Rakovec Inst Palaeontol, Res Ctr, Novi Try 2, SI-1000 Ljubljana, Slovenia.
来源期刊	SEDIMENTARY GEOLOGY
ISSN	0037-0738
EISSN	1879-0968
出版年	2021
卷号	411
英文摘要	In Castatiar Cave (Caceres, Spain), Mg-Si phases forming fibres and films occur associated with aragonite, magnesite, huntite and spheroidal dolomite in moonmilk, coatings and crust speleothems. A detailed study of bulk and carbonate-removed samples allowed us to identify the Mg-Si phases as kerolite (Mg3Si4O10(OH)(2)center dot nH(2)O) and sepiolite Mg4Si6O15(OH)(2)center dot 6(H2O) of variable crystallinity and very pure composition. Under the scanning electron microscope, kerolite appears as gelatinous, smooth masses or films, showing some desiccation features. Sepiolite mostly occurs as isolated fibres 50 to 200 nm thick and up to 50 mu m long and mats of interwoven fibres of several shapes. Analytical pyrolysis (Py-GC/MS) of the organic matter associated with these minerals in the moonmilk speleothems shows a compound assemblage lacking carbohydrates, nitrogen-bearing molecules and fatty acids, indicating no microbial activity. Kerolite and sepiolite most probably formed abiotically by direct precipitation in the cave waters, in conditions of high silica and magnesium activity and relatively high pH. These conditions were attained by local CO2 degassing taking place in extremely slow drips and capillary waters in speleothems with a large surface area, in a dynamic system where the renovation of infiltrated waters and diagenetic transformations of carbonates and silicates also contributed to significant hydrochemical variability at the microscale. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Mg-clays Dolomite Huntite Speleothems Moonmilk Analytical pyrolysis
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000603488400003
WOS关键词	ASSISTED ACID TREATMENT ; CASTANAR CAVE ; MADRID BASIN ; CALCITE PRECIPITATION ; HYDROLOGICAL CONTROLS ; DOLOMITE FORMATION ; CARLSBAD CAVERN ; AMARGOSA DESERT ; BASALTIC CAVES ; CLAY-MINERALS
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/2XILL650/348204
作者单位	[Martin-Perez, Andrea] Slovenian Acad Sci & Arts, Ivan Rakovec Inst Palaeontol, Res Ctr, Novi Try 2, SI-1000 Ljubljana, Slovenia; [La Iglesia, Angel; Alonso-Zarza, Ana Maria] UCM, CSIC, Inst Geociencias, IGEO, Jose Antonio Novels 2, Madrid 28040, Spain; [Almendros, Gonzalo] CSIC, Museo Nacl Ciencias Nat MNCN, Serrano 115-B, Madrid 28006, Spain; [Antonio Gonzalez-Perez, Jose] CSIC, Inst Recursos Nat & Agrobiol Sevilla IRNAS, MOSS Grp, Avda Reina Mercedes 10, Seville 41012, Spain; [Alonso-Zarza, Ana Maria] Univ Complutense Madrid, Fac Ciencias Geol, Dept Mineral & Petrol, Jose Antonio Novais 2, E-28040 Madrid, Spain
推荐引用方式 GB/T 7714	Martin-Perez, Andrea,La Iglesia, Angel,Almendros, Gonzalo,et al. Precipitation of kerolite and sepiolite associated with Mg-rich carbonates in a cave environment[J],2021,411.
APA	Martin-Perez, Andrea,La Iglesia, Angel,Almendros, Gonzalo,Antonio Gonzalez-Perez, Jose,&Alonso-Zarza, Ana Maria.(2021).Precipitation of kerolite and sepiolite associated with Mg-rich carbonates in a cave environment.SEDIMENTARY GEOLOGY,411.
MLA	Martin-Perez, Andrea,et al."Precipitation of kerolite and sepiolite associated with Mg-rich carbonates in a cave environment".SEDIMENTARY GEOLOGY 411(2021).