New insights into the nature of glauconite
Glauconite 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 micros...
| Autores: | , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/216430 |
| Acceso en línea: | http://hdl.handle.net/10261/216430 |
| Access Level: | acceso abierto |
| Palabra clave: | Glauconite Glaucony HRTE Minter stratified Glauconite-smectite XRD |
| id |
ES_2bbcf4f6844c5cbd9e088bd6e3f65fd5 |
|---|---|
| oai_identifier_str |
oai:digital.csic.es:10261/216430 |
| network_acronym_str |
ES |
| network_name_str |
España |
| repository_id_str |
|
| spelling |
New insights into the nature of glauconiteLópez-Quirós, AdriánSánchez Navas, AntonioNieto, F.Escutia, CarlotaGlauconiteGlauconyHRTEMinter stratifiedGlauconite-smectiteXRDGlauconite 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.Walter de GruyterConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2020202020202020info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/216430reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.2138/am-2020-7341Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2164302026-05-22T06:33:51Z |
| dc.title.none.fl_str_mv |
New insights into the nature of glauconite |
| title |
New insights into the nature of glauconite |
| spellingShingle |
New insights into the nature of glauconite López-Quirós, Adrián Glauconite Glaucony HRTE Minter stratified Glauconite-smectite XRD |
| title_short |
New insights into the nature of glauconite |
| title_full |
New insights into the nature of glauconite |
| title_fullStr |
New insights into the nature of glauconite |
| title_full_unstemmed |
New insights into the nature of glauconite |
| title_sort |
New insights into the nature of glauconite |
| dc.creator.none.fl_str_mv |
López-Quirós, Adrián Sánchez Navas, Antonio Nieto, F. Escutia, Carlota |
| author |
López-Quirós, Adrián |
| author_facet |
López-Quirós, Adrián Sánchez Navas, Antonio Nieto, F. Escutia, Carlota |
| author_role |
author |
| author2 |
Sánchez Navas, Antonio Nieto, F. Escutia, Carlota |
| author2_role |
author author author |
| dc.contributor.none.fl_str_mv |
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72] |
| dc.subject.none.fl_str_mv |
Glauconite Glaucony HRTE Minter stratified Glauconite-smectite XRD |
| topic |
Glauconite Glaucony HRTE Minter stratified Glauconite-smectite XRD |
| description |
Glauconite 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. |
| publishDate |
2020 |
| dc.date.none.fl_str_mv |
2020 2020 2020 2020 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article http://purl.org/coar/resource_type/c_6501 Postprint info:eu-repo/semantics/acceptedVersion |
| format |
article |
| status_str |
acceptedVersion |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/10261/216430 |
| url |
http://hdl.handle.net/10261/216430 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
http://dx.doi.org/10.2138/am-2020-7341 Sí |
| dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess |
| eu_rights_str_mv |
openAccess |
| dc.publisher.none.fl_str_mv |
Walter de Gruyter |
| publisher.none.fl_str_mv |
Walter de Gruyter |
| dc.source.none.fl_str_mv |
reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC instname:Consejo Superior de Investigaciones Científicas (CSIC) |
| instname_str |
Consejo Superior de Investigaciones Científicas (CSIC) |
| reponame_str |
DIGITAL.CSIC. Repositorio Institucional del CSIC |
| collection |
DIGITAL.CSIC. Repositorio Institucional del CSIC |
| repository.name.fl_str_mv |
|
| repository.mail.fl_str_mv |
|
| _version_ |
1869405177380864000 |
| score |
15,812429 |