Experimental serpentinization of olivine

Korytkova, E.N.; Kosulina, G. I.; Makarova, T. A.

doi:10.1080/00206817209475804

Cited by 3 publications

(2 citation statements)

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“…The formation of fluorhydroxylchrysotile Mg 6 Si 4 O 10 F x (OH) 8‐ x has been investigated by Ushio and Saito 25. Olivine was completely serpentinized in the presence of NaOH26, and transformed firstly into antigorite, which recrystallizes as chrysotile on further reaction in the presence of NaOH, but forms lizardite in the presence of water 27. Chrysotile microcrystals have been synthesized from olivine and water over a range of different temperature, pressure and time, and 24 various Mg–Ni chrysotile samples have been synthesized by hydrothermal reactions 28.…”

Section: Introductionmentioning

confidence: 99%

Tubular‐Shaped Stoichiometric Chrysotile Nanocrystals

Falini

Foresti

Gazzano

et al. 2004

Chemistry A European J

131

106

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Stoichiometric chrysotile tubular nanocrystals have been synthesized as possible starting materials for applications toward nanotechnology, and as a standard reference sample for the investigation of the molecular interactions between chrysotile, the most utilized asbestos, and biological systems. Chrysotile nanocrystals have been synthesized under controlled hydrothermal conditions, and have been characterized by chemical, morphological, structural, spectroscopic and microcalorimetric analyses. They show a constant "cylinder-in-cylinder" morphology constituted by two or three concentric subunits. Each single nanocrystal has a tubular shape of about 49+/-1 nm in outer maximum diameter, and a hollow core of about 7+/-1 nm. Structural investigation carried out on an X-ray powder pattern allowed to improve the structural model proposed for chrysotile mineral samples. Synthetic chrysotile crystallizes in the monoclinic Cc space group with a=0.5340(1) nm, b=0.9241(1) nm, and c=1.4689(2) nm, beta=93.66(3) degrees.

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Section: Introductionmentioning

confidence: 99%

Tubular‐Shaped Stoichiometric Chrysotile Nanocrystals

Falini

Foresti

Gazzano

et al. 2004

Chemistry A European J

131

106

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“…The reaction of KAISi206 leucite + Na + solution + H20 = NaAISizO6.H20 analcime + K + solution proceeds very rapidly even at moderate temperature ~(the activation energy is about 6-20 Kcal mole-at 150-225 ~ whereas alter- Anolyses hove been performed by )NAA using Ge(Li) cooxiol ond Ce(int) plonsr delecr ation of olivine to serpentine is slower (cf. Korytkova and Makarova, 1971); thus rapid migration of fluids may prevent olivine transformation. The highest stability temperature for analcime at low pressure is about 400 ~ or less, whereas the lowest for olivine (reaction--olivine + water ~ crysotile + brucite) is about 350-400 ~ Thus, considering the large degree of uncertainty in the experimental data, the contemporaneous stability of analcime and olivine in a small temperature interval is consistent.…”

Section: Mti2os Feti20 ~ Feztiosmentioning

confidence: 99%

Cr-Zr-armalcolite-bearing lamproites of Cancarix, SE Spain

et al. 1993

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Lamproites with high MgO, high SiO2 affinity are abundant only in SE Spain where the Cancarix outcrop (in the province of Albacete) occurs. The rocks of Cancarix are peralkaline, saturated to oversaturated in silica, very high in K20, Th and LREE. The mineralogy and petrography show some variations which depend on the conditions of emplacement and rate of cooling of the magma. The following phases may be present: olivine, phlogopite, K-amphibole, clinopyroxene, sanidine, orthopyroxene, apatite, and, in minor amounts, Cr-spinel, minerals of the pseudobrookite group, ilmenite, roedderite, dalyite, carbonate, analcime (probably pseudomorphous on leucite), a silica phase, rutile, pyrochlore (?), britholite (?) and glass. The lamproites of Cancarix contain Cr-Zrarmalcolite, which is typical of lunar basalts and which has been found also in kimberlites. The composition of early magmatic spinel and the occurrence of Cr-Zr-armalcolite indicate low oxygen fugacity for the primitive magma and related mantle source, in agreement with recent experimental data on lamproitic systems. The redox conditions changed during crystallisation, leading to increase of the Fe3+/Fe ~+ ratio in the system. During the later stages of crystallisation, the residual melts/fluids were depleted in alumina and enriched in several components, e.g. Na, Zr, Fe, REE, C1, etc. stabilising Na-Fe-clinopyroxene, dalyte, arfvedsonitic rims around K-richterite and other alumina-free phases which, on a chemical basis, have been identified as britholite and pyrochlore. Rough comparison with experimental systems and the geochemistry of the rocks suggests that the magma was generated at shallow depth (<<20 kbar) in the lithospheric mantle, which, after early depletion, underwent strong enrichment in many 'incompatible' elements.

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