Order-disorder kinetics in orthopyroxenes of ophiolite origin

Article Abstract:

Mossbauer spectroscopy (MS) can be applied in the analysis of iron-magnesium (Fe-Mg) order-disorder kinetics exhibited by orthopyroxenes. Thickness modification in the MS method enhances the accuracy of results from apparent-equilibration temperatures and cooling rates. Furthermore, the amount of Fe at a given temperature affects the structure of ordering in orthopyroxenes in such a way that low Fe-content results in high degree of disorder.

Analysis, Usage, Mossbauer effect, Order-disorder models

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Extreme Nd isotopic variation in the Trinity Ophiolite Complex and the role of melt/rock reactions in the oceanic lithosphere

Article Abstract:

The large Neodymium (Nd) isotopic variation in the Trinity Ophiolite Complex, California, is due to the reaction of a proto-peridotite with ascending basaltic melts, with varying Nd. The isotopic variation is not due to movement of the rare earth elements during interaction of the rock with seawater. The peridotites have a greater variation than the gabbroic massifs and the basic dykes.

California, Natural history, Isotopes, Neodymium, Isotope geology

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Water in boninite glass and coexisting orthopyroxene: concentration and partitioning

Article Abstract:

Spectroscopic analysis of glass samples in pyroxene from boninite specimens from the Bonin Islands in Japan illustrates that water is a major constituent of boninite magmas. However, quenched glass from pillow lava rims in the region have poor water content as a consequence of degassing between the period of melt entrapment in the orthopyroxenes and the following sea floor eruption.

Magma, Glass research

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