Abstract Quantifying the rhythms and rates of magmatic-hydrothermal systems is critical for a better understanding their controls on ore formation dynamics magmatic reservoirs that feed them. We reconstructed evolution ore-forming fluids using hydrothermal quartz from 17.4 Ma Zhibula skarn, Tibet. Ion probe analysis reveals sharp dramatic changes in ?18O values between 5‰ ?9.3‰, with fluid vary...

•80 data have been obtained on 7 of the 17 intrusive centers of diorite and granodiorite (Miocene?) that lie along a N-S belt about 50 km west of the High Cascades. Whole-rock $ values (per mil relative to SMOW) in the intrusive stocks are: -[-2.3 to -t-4.9 (South Umpqua River), -0.7 to -t-3.8 (Bohemia mining district), -t-4.3 to -t-4.6 (Vida stock), -0.2 to -t-5.5 (Nimrod stock), --1.7 to -}-0...

We report here a general synthetic strategy to encapsulate metal clusters within zeolites during their hydrothermal crystallization. Precursors to metal clusters are stabilized against their premature colloidal precipitation as hydroxides during zeolite crystallization using bifunctional (3-mercaptopropyl)trimethoxysilane ligands. Mercapto (-SH) groups in these ligands interact with cationic me...

Fe-substituted MWW-type zeolites ([Fe]-MWWMC) were successfully synthesized by a mechanochemically assisted hydrothermal synthesis, termed the mechanochemical method, for first time and compared with samples prepared conventional method ([Fe]-MWWHT). A reaction between SiO2 ?-FeOOH, which is step of yielded an amorphous Si–Fe composite oxide that consisted tetrahedrally coordinated Fe species i...

The rational design of ultra-small metal clusters dispersed on a solid is crucial importance in modern nanotechnology and catalysis. In this contribution, the concept catalyst fabrication with very size platinum nanoparticles supported hierarchical zeolite surface via one-pot hydrothermal system was demonstrated. Combining gel ethylenediaminetetraacetic acid (EDTA) as ligand precursor during cr...

Monitoring Yellowstone National Park’s hydrothermal systems and establishing hydrothermal baselines are the main goals of an ongoing collaborative effort between Yellowstone National Park’s Geology program and Utah State University’s Remote Sensing Services Laboratory. During the first years of this research effort, improvements were made in image acquisition, processing and calibration. In 200...

It has been shown experimentally by many researchers that cooling rate and crystallization temperature affect the rate of crystal formation. In this study, crystallization kinetics of coconut oil was measured by monitoring the solid fraction of the oil using pulsed Nuclear Magnetic Resonance (pNMR). Four levels of cooling rate and crytallization temperature were studied. Parameters of crystalli...

based on driving force for crystallization of one-component gas hydrate, in this report an expression for the supersaturation for crystallization of multicomponent gas hydrate is derived. expressions for the supersaturation are obtained in isothermal and isobaric regimes. the results obtained are applied to the crystallization of hydrates of mixtures of methane plus ethane and can apply to othe...

The field work, backscattered electron images and detailed microanalyses of three generations tourmaline from the Namacotche LCT pegmatites allows de distinction between compositional magmatic hydrothermal tourmalines. generation 1 occurs in outer intermediate zone pegmatite. It consists zoned crystals with an oscillatory inner core foitite schorl, schorl Fe-rich fluor-elbaite rim. Unzoned occu...

Thermal and hydrothermal biochars were characterized, and adsorption of bisphenol A (BPA), 17α-ethinyl estradiol (EE2) and phenanthrene (Phen) was determined to investigate the sorption characteristic difference between the two types of biochars. Thermal biochars were composed mostly of aromatic moieties, with low H/C and O/C ratios as compared to hydrothermal ones having diverse functional gro...