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- W1574657392 abstract "Diopside solid solutions (Diss) from a sheared lherzolite and a discrete megacryst from the Thaba Putsoa Kimberlite Pipe, Lesotho, have been examined by means of transmission electron microscopy. The clinopyroxene in the sheared lherzolite (PHN 1611) has a Ca/(Ca+Mg) of 0.315, whereas the ratio is equal to 0.320 in the discrete megacryst (PHN 1600E4). Crushed grains of each sample were observed with a Siemens Elmiskop I, operating at 100kV. In both specimens exsolution lamellae of pigeonite are present and appear to be parallel to (001) of the diopside host. The average of at least 4 measurements yields values of lamellae thicknesses of 187±8 Å for PHN 1600E4 and 192±12 Å for PHN 1611. The scale of the exsolution microstructures or wavelength (λ) indicates that the process occurred rapidly. From the recent experimental results of McCallister and Yund (1977) on exsolution mechanisms and microstructures in iron-free pyroxenes, it is possible to delineate the (001) coherent spinodal for diopside solid solutions with Ca/Ca+Mg ≥ 0.27. For a Ca/Ca+Mg = 0.317 the (001) coherent spinodal is located between 1275°–1300°C. At 1300°C, although well within the solvus, no exsolution occurred in the experimental runs; however, at and below 1275°C exsolution occurred by spinodal decomposition with a resulting exsolution microstructure remarkably similar to that observed in the natural clinopyroxenes. In an attempt to arrive at a thermal history of the latter specimens, a series of continuous cooling experiments was made on a synthetic Diss (Ca/Ca+Mg = .317). For a cooling rate equivalent to 20°C/hr, a λ of 178±10 Å was obtained. This result compares favorably with that from the natural materials in which the average λ is 190±10 Å, and suggests that their cooling time from 1300°–1000°C was on the order of 15 hours." @default.
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- W1574657392 date "1979-01-01" @default.
- W1574657392 modified "2023-10-16" @default.
- W1574657392 title "Partial thermal history of two exsolved clinopyroxenes from the Thaba Putsoa Kimberlite Pipe, Lesotho" @default.
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- W1574657392 doi "https://doi.org/10.1029/sp016p0244" @default.
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