Crystal structure of celadonite from the electron diffraction data

Zhukhlistov, A. P.

doi:10.1134/1.2132393

Cited by 12 publications

(6 citation statements)

References 3 publications

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“…XRD Data. XRD analysis of the bluish-green mineral phase from the vesicles of the three analyzed flows (Figure 8 and Table 3) is consistent with celadonite as the 9 Lithosphere dominant phase [19,58,[60][61][62][63][64]. Table 3 lists the corresponding peaks measured with synchrotron radiation ðλ = 0:798 ÅÞ and CuKα radiation ðλ = 1:54060 ÅÞ and d-spacing and intensities used for identification.…”

Section: Occurrence and Petrographic Description Of Celadonitementioning

confidence: 54%

Posteruptive Thermal History of the Proterozoic Basaltic North Shore Volcanic Group of the Midcontinent Rift: Evidence from K/Ar Data of Celadonite

2021

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This study reports three K/Ar ages on celadonite, a dioctahedral K-Fe mica, in the Proterozoic North Shore Volcanic Group (NSVG) of the Midcontinent Rift in northeastern Minnesota. Celadonite formed during beginning posteruptive, low-temperature conditions at temperatures<100°C and with input of meteoric water. K/Ar ages between 1062±16 Ma and 955.0±12 Ma document a remarkably long posteruptive thermal history of >100 myrs in a thick continental basaltic sequence. In the stratigraphically lower part of the NSVG, celadonite formation occurred at 1062±16 Ma in an amygdule or a vesicle filled with celadonite, while another celadonite amygdule in a stratigraphically higher flow was dated at 1039.4±14 Ma. Both flows are overprinted by a later multistage lower zeolite-phyllosilicate facies assemblage (laumontite-albite-corrensite±chlorite±smectite±prehnite±pumpellyite). In the stratigraphically higher part of the sequence, celadonite crystallization at an amygdule rim is followed by upper zeolite facies conditions (stilbite-heulandite-smectite assemblage) and was dated at 955.0±12.4 Ma. The constrained time frame of 107 myrs indicates a long-lived, probably not continuous and locally occurring, posteruptive thermal alteration process. The data suggest that alteration was depth-controlled and temporally and spatially inhomogeneous and implies the progression of the sequence from a close-to-the-surface alteration mode with input of meteoric water to a burial metamorphic mode and with locally occurring hydrothermal activity due to continuous magmatic activity. Volcanism in the Midcontinent Rift system is supposed to have lasted between 1109 Ma and 1083 Ma based on U/Pb zircon ages. The first crystallization of celadonite is recorded in the lower part of the NSVG and occurred ca. 30 myrs after the emplacement of the Silver Bay aplite intrusion in the upper part of the NSVG. Burial rates are determined to be 0.04 km·Ma-1and 0.10 km·Ma-1. The hydrothermal alteration under low-temperature burial conditions clearly postdates the rift-related alkaline and tholeiitic magmatism of the Midcontinent Rift and overlaps with the depositional window of the sedimentary rocks that overlie the Midcontinent Rift volcanics, as well as crustal-scale fault systems that were active during Grenvillian tectonic uplift after the cessation of magmatic activity.

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Section: Occurrence and Petrographic Description Of Celadonitementioning

confidence: 54%

Posteruptive Thermal History of the Proterozoic Basaltic North Shore Volcanic Group of the Midcontinent Rift: Evidence from K/Ar Data of Celadonite

2021

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“…The corresponding ideal end-member formula is then KMn 3+ MgSi 4 O 10 (OH) 2 which is related to celadonite by the homovalent substitution VI Mn 3+ → VI Fe 3+ . In accordance with this conclusion, d values calculated from fitted peak positions in the X-ray spectrum (Table 1) parameters using the software UnitCell (Holland and Redfern, 1997), basing the assignment of hkl reflection positions on the data from Zhukhlistov (2005) for celadonite-1M. The resulting monoclinic cell is: a = 5.149(1), b = 8.915(1), c = 10.304(1) Å, β = 102.03(1)°.…”

Section: Resultsmentioning

confidence: 65%

A multimethodic approach for the characterization of manganiceladonite, a new member of the celadonite family from Cerchiara mine, Eastern Liguria, Italy

et al. 2017

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In the manganesiferous ores associated with the metacherts of the ophiolitic sequences at the Cerchiara mine, Eastern Liguria (Italy), a new Mn-bearing mineral belonging to the mica group has been recently found and characterized. High resolution transmission electron microscopy and electron diffraction tomography studies confirm that the mineral belongs to the mica group. Unit-cell parameters from the powder diffraction pattern are:a= 5.149(1),b= 8.915(1),c= 10.304(1) Å, β = 102.03(1)°, space groupC2 orC2/m. On the basis of the electron paramagnetic resonance spectroscopic results, the Mn4+content represents a very subordinate fraction of the total Mn, the remaining occurring as Mn3+. The Raman spectrum clearly indicates the presence of OH groups in the structure. Laser-ablation inductively-coupled-plasma mass-spectrometry measurements assess the presence of considerable amounts of Li.Assuming all Mn as Mn3+and 22 negative charges, the empirical formula can be expressed as: (K0.83□0.17)(Mn1.143+Mg0.80Li0.20Fe0.023+)(Si3.89Al0.10)O10[(OH)1.92F0.08] with the sum of the octahedral cations indicating a 'transitional' character between a di- and a tri-octahedral structure. This formula corresponds ideally to the Mn3+analogue of celadonite, thus expanding the range of solid solution in the celadonite family. The ideal end-member formula KMn3+MgSi4O10(OH)2can be easily related to celadonite by the homovalent substitutionVIMn3+→VIFe3+. The mineral and its name have been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association, (IMA 2015-052).

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“…6b). The 1M polytype is the usual one of celadonite according to all the structural determinations in the literature (Zvyagin, 1957;Zhukhlistov et al, 1977;Tsipurskii and Drits, 1986;Zhukhlistov, 2005). In addition, celadonite crystals are thicker (more than 20 layers, that is > 20 nm thick) than the glauconitic laths, which reach no more than 10 nm in thickness, ranging from 3 to 10 lay-ers of 1 nm (Fig.…”

Section: Tem Observationsmentioning

confidence: 82%

“…From the first description of celadonite structure (Zvyagin, 1957;Zhukhlistov et al 1977, Tsipurskii andDrits, 1986;Zhukhlistov, 2005;Dorset, 1992), it is known that the usual difference in size between trans-octahedral (M1) and cisoctahedral (M2) positions, generally found in all dioctahedral phyllosilicates, is minimum for celadonite (Fig. 10c).…”

Section: Compositional Gap and Structural Relationships Between Glauconite And Celadonitementioning

confidence: 99%

Textural and genetic relationships between glauconite and celadonite at the nanoscale: two different structural-compositional fields

Nieto

Abad²,

Bauluz

et al. 2021

Eur. J. Mineral.

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Abstract. Glauconite and celadonite coexist at the nanometre scale in Early Jurassic submarine volcanic rocks of the Betic Cordillera (southern Spain) as a result of microbial activity. Samples from the limit between the two micas, recognizable in scanning electron microscopy, have been extracted using the focussed ion beam technique and studied by high-resolution analytical electron microscopy. Both micas are present as randomly oriented differentiated small crystals in the boundary area. They define clearly distinct compositional fields with gaps affecting to Fe, Mg and K. At the lattice scale, celadonite shows a high degree of order, with homogeneous orientation of the visible lattice parameters being a difference from glauconite, formed by packets no more than 10-layers thick. Smectite layers were also detected alongside glauconite packets, in accordance with X-ray diffractograms which indicate that glauconite is a mica–smectite interstratification being more than 90 % mica layers. The compositional gap indicates that celadonite is not the endmember of the glauconitic series and the two micas represent two different structural tendencies of mica, with glauconite having more distorted octahedral sheets, indicated by systematically higher b parameters than celadonite.

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Crystal structure of celadonite from the electron diffraction data

Cited by 12 publications

References 3 publications

Posteruptive Thermal History of the Proterozoic Basaltic North Shore Volcanic Group of the Midcontinent Rift: Evidence from K/Ar Data of Celadonite

Posteruptive Thermal History of the Proterozoic Basaltic North Shore Volcanic Group of the Midcontinent Rift: Evidence from K/Ar Data of Celadonite

A multimethodic approach for the characterization of manganiceladonite, a new member of the celadonite family from Cerchiara mine, Eastern Liguria, Italy

Textural and genetic relationships between glauconite and celadonite at the nanoscale: two different structural-compositional fields

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