Core level studies of calcite and dolomite

Anisotropic surface coupling while sliding on dolomite and calcite crystals

Carlos M. Pina,1 Rodolfo Miranda,2,3 and Enrico Gnecco2 1Department of Crystallography and Mineralogy, Complutense University of Madrid, E-28040 Madrid, Spain 2Instituto Madrileño de Estudios Avanzados, IMDEA Nanociencia, Campus Universitario de Cantoblanco, E-28049 Madrid, Spain 3Departamento de Fı́sica de la Materia Condensada, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain (...

Oxygen Isotope Fractionation between Coexisting Calcite and Dolomite.

The oxygen isotopic composition of calcite from carbonate rocks of the lower unit of the Flagstaff formation (Paleocene) exposed along the western margin of the Wasatch Plateau, Utah, is about 7 per mil lower than that of coexisting dolomite, suggesting that isotopic equilibration of these two minerals can occur at relatively low temperatures. Unlike recent isotopic evidence presented by Degens...

postnatal studies of bats (pipistrellus kuhlii and miniopterus schreibersii) & histomorphology and histochemistry studies of organs and diseases of (neurergus microspilotus and n. kaiseri)

1. to determine whether difference in birth body mass influenced growth performance in pipistrellus kuhlii we studied a total of 12 captive-born neonates. bats were assigned to two body mass groups: light birth body mass (lbw: 0.89 ± 0.05, n=8) and heavy birth body mass (hbw: 1.35 ± 0.08, n=4). heavier body mass at birth was associated with rapid postnatal growth (body mass and forearm length) ...

Direct nanoscale observations of the coupled dissolution of calcite and dolomite and the precipitation of gypsum

In-situ atomic force microscopy (AFM) experiments were performed to study the overall process of dissolution of common carbonate minerals (calcite and dolomite) and precipitation of gypsum in Na2SO4 and CaSO4 solutions with pH values ranging from 2 to 6 at room temperature (23 ± 1 °C). The dissolution of the carbonate minerals took place at the (104) cleavage surfaces in sulfate-rich solutions ...

Characterization of Experimental Shock Effects in Calcite and Dolomite by X-ray Diffraction