000079574 001__ 79574
000079574 005__ 20200117221618.0
000079574 0247_ $$2doi$$a10.1180/clm.2018.8
000079574 0248_ $$2sideral$$a109472
000079574 037__ $$aART-2018-109472
000079574 041__ $$aeng
000079574 100__ $$0(orcid)0000-0002-4970-6333$$aBauluz, B.$$uUniversidad de Zaragoza
000079574 245__ $$aAmmonium-bearing micas in very low-grade metapelites: micro- and nano-texture and composition
000079574 260__ $$c2018
000079574 5060_ $$aAccess copy available to the general public$$fUnrestricted
000079574 5203_ $$aThe present study examines the micro- and nano-texture and composition of an ammonium-bearing and potassium micas in very-low grade metamorphic black Silurian shales from the SE Iberian Range (NE Spain). Two organic-rich shales were studied by X-ray diffraction (XRD), infrared spectroscopy (IR), transmission electron microscopy (TEM), analytical electron microscopy (AEM) and electron energy loss spectroscopy (EELS). The XRD showed the presence of two populations of micas: pure K micas with d(001) = 9.98 angstrom and ammonium-bearing micas with larger d(001) values (10.08 angstrom and 10.05 angstrom). The latter values indicate NH4 contents between 13 and 29% in the interlayer, which was confirmed by IR. Interstratifications of smectite and mica layers in the mica packets were not detected by XRD and TEM. Mica packets with sizes ranging from 100 to 250 angstrom show disordered polytypes and (001) lattice fringes that reflect the presence of K- and NH4-bearing layers (9.9-10.2 angstrom). The combination of AEM and EELS analyses on powdered and lamellar samples indicates that micas have typical dioctahedral compositions with highly variable K contents. This variation in K is consistent with the presence of K and NH4 in the interlayers, even though the NH4 and K are not distributed homogeneously; rather they are segregated in nm-sized domains in the mica interlayer.
000079574 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E45$$9info:eu-repo/grantAgreement/ES/MINECO/CGL2013-46169-C2-1-P
000079574 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000079574 590__ $$a1.787$$b2018
000079574 591__ $$aCHEMISTRY, PHYSICAL$$b104 / 148 = 0.703$$c2018$$dQ3$$eT3
000079574 591__ $$aMINERALOGY$$b15 / 29 = 0.517$$c2018$$dQ3$$eT2
000079574 591__ $$aGEOSCIENCES, MULTIDISCIPLINARY$$b114 / 195 = 0.585$$c2018$$dQ3$$eT2
000079574 592__ $$a0.415$$b2018
000079574 593__ $$aGeochemistry and Petrology$$c2018$$dQ3
000079574 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000079574 700__ $$aNieto, F.
000079574 7102_ $$12000$$2120$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Cristalografía Mineralog.
000079574 773__ $$g53, 2 (2018), 105–116$$pClay miner.$$tCLAY MINERALS$$x0009-8558
000079574 8564_ $$s320867$$uhttps://zaguan.unizar.es/record/79574/files/texto_completo.pdf$$yVersión publicada
000079574 8564_ $$s64253$$uhttps://zaguan.unizar.es/record/79574/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000079574 909CO $$ooai:zaguan.unizar.es:79574$$particulos$$pdriver
000079574 951__ $$a2020-01-17-21:51:57
000079574 980__ $$aARTICLE