Metamorphic minerals in the ultramafic rocks from Kitakami mountainland (1)

Slow oxygen diffusion rates in igneous zircons from metamorphic rocks

Empirical tests of oxygen exchange rate in zircon crystals from amphiboliteand granulite-facies metamorphic rocks of the Grenville Province demonstrate preservation of igneous dO through protracted igneous and metamorphic histories, forming the basis of quantitative estimates of diffusion rate. Granitic orthogneisses, which cooled slowly after granulite-facies metamorphism, show no consistent r...

Groundwater in Sedimentary, Metamorphic and Volcanic Rocks

The Composition of Earth: Rocks and Minerals

Weathering of Chlorite a N D Vermiculite in Ultramafic Rocks of Cabo Ortegal, Northwestern Spain 1

-Chloritic veins in serpentinite and their weathering products were analyzed by X-ray powder diffraction (XRD) and X-ray fluorescence spectrometry (XRF). Chlorite formed during the Hercynianage orogenesis had apparently been partly transformed to high-charge vermiculite during subsequent metamorphism of the rocks. The idealized structural formulae for these minerals are (mlL9Fea+0.zFe2+o.4Mg9.2...

Petrology, Geochemistry and Tectonic Significance of Serpentinised Ultramafic Rocks from the South Arm of Sulawesi, Indonesia