Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/216430
Share/Export:
logo share SHARE logo core CORE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
DC FieldValueLanguage
dc.contributor.authorLópez-Quirós, Adrián-
dc.contributor.authorSánchez Navas, Antonio-
dc.contributor.authorNieto, F.-
dc.contributor.authorEscutia, Carlota-
dc.date.accessioned2020-07-10T10:20:20Z-
dc.date.available2020-07-10T10:20:20Z-
dc.date.issued2020-05-26-
dc.identifierdoi: 10.2138/am-2020-7341-
dc.identifierissn: 1945-3027-
dc.identifier.citationAmerican Mineralogist 105: 674-686 (2020)-
dc.identifier.urihttp://hdl.handle.net/10261/216430-
dc.description.abstractGlauconite must be assessed as mica-rich mica-smectite R3 interstratified mineral, with the pure end-member mica also having intrinsic K-deficient chemical characteristics (K ~ 0.8 apfu). This assertion is in accordance with our X‑ray diffraction (XRD) and high-resolution tranmission electron microscopy (HRTEM) studies and chemical analyses by electron probe microanalysis (EPMA) of mature glauconites in Cenozoic Antarctic sediments that indicate that: (1) It consists of a glauconite-smectite (R3 ordered) mixed-layer silicate, composed mainly of mica-type layers (>90%), but displaying slightly different proportions of Fe(III)-smectite layers (<10%). (2) More mature glaucony grains are characterized by major K and Fe (mica layers) and minor Fe (smectite layers) content in the interstratified glauconite-smectite. (3) Potassium is stabilized at the interlayer site by the octahedrally coordinated Fe. (4) Microtexture of the glauconite crystals are comparable with those of other micas and illite minerals, with straight, defect-free lattice fringes of ~10 Å spacings glauconite packets characteristic of mica with minor interstratified poorly crystalline smectite layers. In addition, our new findings give insights into the glauconitization process and at the same time investigate the potassium-deficient character of the dioctahedral mica "glauconite." These findings show that glauconite crystallizes by a layer-growth mechanism at the expense of a poorly crystalline smectite precursor and that smectite-to-glauconite transformations are accompanied by a gradually higher octahedral charge deficiency (Fe/Fe) stabilized by K uptake into the interlayer sheet.-
dc.languageeng-
dc.publisherWalter de Gruyter-
dc.relation.isversionofPostprint-
dc.rightsopenAccessen_EN
dc.subjectGlauconite-
dc.subjectGlaucony-
dc.subjectHRTE-
dc.subjectMinter stratified-
dc.subjectGlauconite-smectite-
dc.subjectXRD-
dc.titleNew insights into the nature of glauconite-
dc.typeartículo-
dc.identifier.doi10.2138/am-2020-7341-
dc.relation.publisherversionhttp://dx.doi.org/10.2138/am-2020-7341-
dc.embargo.terms2021-05-26-
dc.date.updated2020-07-10T10:20:21Z-
dc.rights.licensehttps://creativecommons.org/licenses/by/4.0/-
dc.relation.csic-
dc.type.coarhttp://purl.org/coar/resource_type/c_6501es_ES
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.grantfulltextnone-
item.openairetypeartículo-
item.fulltextNo Fulltext-
item.cerifentitytypePublications-
Appears in Collections:(IACT) Artículos
Files in This Item:
File Description SizeFormat
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
View/Open
Show simple item record

SCOPUSTM   
Citations

17
checked on May 25, 2022

WEB OF SCIENCETM
Citations

16
checked on May 25, 2022

Page view(s)

177
checked on May 28, 2022

Download(s)

22
checked on May 28, 2022

Google ScholarTM

Check

Altmetric

Dimensions


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.