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Petrological constraints on the formation conditions and retrograde P–T path of the Kotsu eclogite unit, central Shikoku (2003)

Matsumoto, M. ; Wallis, S. ; Aoya, M. ; [et al.]

Oxford, UK : Blackwell Science Inc

Journal of metamorphic geology 21 (2003), S. 0

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ISSN: 1525-1314

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences

Notes: A largely undocumented region of eclogite associated with a thick blueschist unit occurs in the Kotsu area of the Sanbagawa belt. The composition of coexisting garnet and omphacite suggests that the Kotsu eclogite formed at peak temperatures of around 600 °C synchronous with a penetrative deformation (D1). There are local significant differences in oxygen fugacity of the eclogite reflected in mineral chemistries. The peak pressure is constrained to lie between 14 and 25 kbar by microstructural evidence for the stability of paragonite throughout the history recorded by the eclogite, and the composition of omphacite in associated eclogite facies pelitic schist. Application of garnet-phengite-omphacite geobarometry gives metamorphic pressures around 20 kbar. Retrograde metamorphism associated with penetrative deformation (D2) is in the greenschist facies. The composition of syn-D2 amphibole in hematite-bearing basic schist and the nature of the calcium carbonate phase suggest that the retrograde P–T path was not associated with a significant increase or decrease in the ratio of P–T conditions following the peak of metamorphism. This P–T path contrasts with the open clockwise path derived from eclogite of the Besshi area. The development of distinct P–T paths in different parts of the Sanbagawa belt shows the shape of the P–T path is not primarily controlled by tectonic setting, but by internal factors such as geometry of metamorphic units and exhumation rates.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1525-1314.2003.00449.x

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A Thermal and Structural Study On Lanthanum Hexacyanocobaltate(III) Pentahydrate, La[Co(CN)6]⋅5H2O (2000)

Masuda, Y. ; Seto, Y. ; Wang, X. ; [et al.]

Springer

Journal of thermal analysis and calorimetry 60 (2000), S. 1033-1041

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ISSN: 1572-8943

Keywords: dehydration ; lanthanum hexacyanocobaltate(III) ; structural change ; thermal analysis

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract Thermal and structural changes of lanthanum hexacyanocobaltate(III) pentahydrate, La[Co(CN)6]⋅5H2O were investigated by means of thermal analysis, visible electronic spectra, IR, powder X-ray diffraction, EXAFS and TG-MS. The dehydration of La[Co(CN)6]⋅5H2O proceeded reversibly through three steps and steps corresponded to the losses of H2O, 3H2O and H2O, and the enthalpy changes for these steps were 51.3, 211.0 and 38.7 kJ mol−1, respectively. After the dehydration, the colour of the anhydride changed from white to blue around 290°C and an abrupt mass loss occurred at 350°C. The colour change seems to be attributable to the change of coordination geometry around the Co ions from an octahedral structure to a tetrahedral one. LnCoO3 was obtained as a final product by heating the sample to 1000°C.