Browsing ELibrary by Author "Xu Z."

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AL, SI, AND MG OCCUPANCIES IN TETRAHEDRALLY AND OCTAHEDRALLY COORDINATED SITES IN SYNTHETIC ALUMINOUS TREMOLITE

Jenkins D.M.; Sherriff B.L.; Cramer J.; Xu Z. (1997)

A series of aluminous tremolites was synthesized at 800-850 8C and 6-13 kbar along the join Ca1.8Mg5.2Si8O22(OH)2-Ca1.8(Mg4.2Al)(AlSi7)O22(OH)2 by means of the Mg-Tscher- maks substitution. Although the amphibole yields ...
H2O DIFFUSION IN DACITIC AND ANDESITIC MELTS

Behrens H.; Zhang Y.; Xu Z. (2004)

The diffusion of water in dacitic and andesitic melts was investigated at temperatures of 1458 to 1858 K and pressures between 0.5 and 1.5 GPa using the diffusion couple technique. Pairs of nominally dry glasses and hydrous ...
HYDROUS SPECIES GEOSPEEDOMETER IN RHYOLITE: IMPROVED CALIBRATION AND APPLICATION

Zhang Y.; Xu Z.; Behrens H. (2000)

The hydrous species geospeedometer is based on the homogeneous interconversion reaction between molecular H2O species and OH species in silicate melts and glasses. Here we report new data for the calibration of the ...
KINETICS OF CONVECTIVE CRYSTAL DISSOLUTION AND MELTING, WITH APPLICATIONS TO METHANE HYDRATE DISSOLUTION AND DISSOCIATION IN SEAWATER

Zhang Y.; Xu Z. (2003)

Large quantities of methane hydrate are present in marine sediment. When methane hydrate is exposed or released to seawater, it dissolves in seawater or dissociates into methane gas and water. There was some confusion in ...
OXYGEN SITE EXCHANGE KINETICS OBSERVED WITH SOLID STATE NMR IN A NATURAL ZEOLITE - OH CATALYSIS

Xu Z.; Stebbins J.F. (1998)

17O solid state nuclear magnetic resonance (NMR) was applied to study the oxygen exchange kinetics between framework oxygens and oxygens in the channel waters in the zeolite mineral stilbite. We have shown that framework ...
QUENCH RATES IN AIR, WATER, AND LIQUID NITROGEN, AND INFERENCE OF TEMPERATURE IN VOLCANIC ERUPTION COLUMNS

Xu Z.; Zhang Y. (2002)

We apply a geospeedometer previously developed in this lab to investigate cooling rate profiles of rhyolitic samples initially held at 720-750°C and quenched in water, liquid nitrogen, and air. For quench of mm-size samples ...
RAPID SLIP ALONG THE CENTRAL ALTYN TAGH FAULT: MORPHOCHRONOLOGIC EVIDENCE FROM CHERCHEN HE AND SULAMU TAGH

Mériaux A.-S.; Tapponnier P.; Ryerson F.J.; Van der Woerd J.; Finkel R.C.; Caffee M.W.; Xu X.; Xu Z. (2004)

To better constrain the ongoing rates of deformation in northern Tibet, the ages of fluvial and glacial geomorphic markers left-laterally displaced by the Altyn Tagh Fault have been determined by radiocarbon and 10Be-26Al ...
SIZE FRACTIONATION BY SUSPENSION TRANSPORT: A LARGE SCALE FLUME EXPERIMENT WITH SHOALING WAVES

Greenwood B.; Xu Z. (2001)

Laboratory simulation of wave shoaling over a medium sand bed (mean size=250μm) for a range of wave conditions (a natural spectrum, symmetrical and asymmetrical wave groups) showed that a distinct horizontal fractionation ...

Browsing ELibrary by Author "Xu Z."

Browsing ELibrary by Author "Xu Z."

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