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DOI	10.3390/min9110696
	Spanish Bentonites: A Review and New Data on Their Geology, Mineralogy, and Crystal Chemistry
	Garcia-Romero, Emilia 1,2,3; Maria Manchado, Eva 4; Suarez, Mercedes 4; Garcia-Rivas, Javier 5
通讯作者	Garcia-Romero, Emilia
来源期刊	MINERALS
EISSN	2075-163X
出版年	2019
卷号	9 期号:11
英文摘要	A review and a synthesis of the geological, mineralogical, and crystal chemical data available in the literature on active Spanish bentonitic exploitations were done, and at the same time, new data are provided from a set of representative samples from these deposits. They were located in three different areas with different geological origins: (1) Miocene sedimentary deposits from the Tajo Basin (Madrid-Toledo provinces) in the center of the Iberian Peninsula, where bentonites appear in two different units named for their colors (Green Clays and Pink Clays); (2) samples from Tamame de Sayago (Zamora province) originating from the hydrothermal alteration of granitic Variscan rocks; and 3) Miocene deposits originating from the hydrothermal alteration of volcanic or subvolcanic rocks from the Cabo de Gata volcanic area (Almeria Province) in the southern part of Spain, where the three main deposits (Cortijo de Archidona, Los Trancos, and Morron de Mateo) were studied. The bentonites from the Tajo Basin were formed mainly by trioctahedral smectites, and there were significant mineralogical differences between the Green and Pink Clays, both in terms of the contents of impurities and in terms of smectite crystallochemistry and crystallinity. The smectites from Tamame de Sayago were dioctahedral (montmorillonite-beidellite series), and they appeared with kaolinite, quartz, and mica in all possible proportions, from almost pure bentonite to kaolin. Finally, the compositions of the bentonites from the three studied deposits in Cabo de Gata were quite similar, and zeolites and plagioclases were the main impurities. The structural formulae of the smectites from Cortijo de Archidona and Los Trancos showed a continuous compositional variation in beidellite-montmorillonite, while in Morron de Mateo, the smectites were mainly montmorillonite, although there was continuous compositional variation from Al montmorillonites to Fe-Mg-rich saponites. The variation in the smectite composition is due to the intrusion of a volcanic dome, which brings new fluids that alter the initial composition of the smectites.
英文关键词	bentonite smectite Mg clays stevensite saponite montmorillonite beidellite kerolite
类型	Review
语种	英语
国家	Spain ; Portugal
开放获取类型	gold, Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000502267100049
WOS关键词	CENTRAL IBERIAN ZONE ; CABO-DE-GATA ; MADRID BASIN ; EXTENSIONAL COLLAPSE ; SMECTITE FORMATION ; AMARGOSA DESERT ; CLAY-MINERALS ; RICH CLAYS ; MG CLAYS ; GENESIS
WOS类目	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS研究方向	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
EI主题词	2019-11-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310544
作者单位	1.Univ Complutense Madrid, Dept Mineral & Petrol, Madrid 28040, Spain; 2.Spanish Res Council, Geosci Inst IGEO, Madrid 28040, Spain; 3.Univ Complutense Madrid, CSIC UCM, Madrid 28040, Spain; 4.Univ Salamanca, Dept Geol, E-37008 Salamanca, Spain; 5.Univ Lisbon, Inst Super Tecn, Ctr Nucl Sci & Technol C2TN, P-2695066 Bobadela Lrs, Portugal
推荐引用方式 GB/T 7714	Garcia-Romero, Emilia,Maria Manchado, Eva,Suarez, Mercedes,et al. Spanish Bentonites: A Review and New Data on Their Geology, Mineralogy, and Crystal Chemistry[J],2019,9(11).
APA	Garcia-Romero, Emilia,Maria Manchado, Eva,Suarez, Mercedes,&Garcia-Rivas, Javier.(2019).Spanish Bentonites: A Review and New Data on Their Geology, Mineralogy, and Crystal Chemistry.MINERALS,9(11).
MLA	Garcia-Romero, Emilia,et al."Spanish Bentonites: A Review and New Data on Their Geology, Mineralogy, and Crystal Chemistry".MINERALS 9.11(2019).