Zobrazeno 1 - 10
of 273
pro vyhledávání: '"Joseph V. Smith"'
Autor:
Robert W. Broach, Robert L. Bedard, Joseph J. Pluth, Richard M. Kirchner, Lisa M. King, Joseph V. Smith
Publikováno v:
Journal of Solid State Chemistry. 196:341-348
The chemistry and structure of a novel indium phosphate material (RIPS-4), (H3NCH2CH2NH3)In3-P3O12(OH)2, are described. RIPS-4 was synthesized using ethylene diamine as a structure-directing organic agent. The X-ray crystal structure was determined f
Autor:
Robert E. Zartman, Joseph V. Smith
Publikováno v:
Chemical Geology. 261:185-195
The age of the Mesoproterozoic Belt Supergroup hosted silver and base metal vein deposits of the Coeur d'Alene mining district in northern Idaho has long been controversial. Evidence for Precambrian mineralization comes largely from many ∼ 1400 Ma
Autor:
Joseph V. Smith
Publikováno v:
Elements. 1:151-156
The early Earth was hot and chaotic, bombarded intensely from 4.5 to 3.8 billion years ago. In ponds near the flanks of volcanoes, feldspars and zeolites from volcanic flows and ash were alternately washed by fluids and dried, fostering adsorption an
Autor:
Joseph V. Smith, Joseph J. Pluth
Publikováno v:
Proceedings of the National Academy of Sciences. 99:11002-11005
A crystal from the type locality Ajo, AZ, yielded just enough intensity from streaked diffractions using synchrotron x-rays at the Advanced Photon Source to solve the crystal structure with composition (K + Na) 3 Cu 20 Al 3 Si 29 O 76 (OH) 16 ⋅∼8
Publikováno v:
European Journal of Mineralogy. 13:51-56
At Napoleon Bay, Baffin Island, fibrous aggregates define the contacts of Mesoproterozoic lamproite dykes with feldspathic wall-rock. The aggregates are composed of nepheline, pectolite and andesine, with fibre extensions along c , b and an indetermi
Autor:
Robert W. Broach, Ralf W Grosse-Kunstleve, Joseph V. Smith, Joseph J. Pluth, S.T. Wilson, Richard M. Kirchner
Publikováno v:
Microporous and Mesoporous Materials. 39:319-332
AlPO 4 -53 was synthesized hydrothermally with methylamine as a structure-directing agent. The structure of as-synthesized AlPO-53(A) was solved using AlPO-EN3 as a starting model. The Rietveld refinement converged ( R P = 0.140) in space group P2 1
Autor:
Joseph V. Smith
Publikováno v:
International Geology Review. 42:617-656
Dangers from natural hazards have been characterized quantitatively by national and international committees of geoscientists based on technical advances in geochemistry and geophysics (sensu lato). The current status of knowledge on natural hazards
Autor:
Joseph V. Smith, Peter J. Eng, Robert M. Housley, Joseph J. Pluth, Ian M. Steele, Peter C. Burns
Publikováno v:
American Mineralogist. 85:604-607
The structure of quetzalcoatlite, Zn_6Cu_3(TeO_3)_2O_6(OH)_6(Ag_xPby)Cl_(x+2y), x + y ≤ 2, Z = 1, was solved and refined using data collected at the Advanced Photon Source-GSE-CARS facility, using a 2 × 2 ×40 μm^3 single crystal. The structure i
Publikováno v:
Contributions to Mineralogy and Petrology. 136:92-110
The Multiple Diffusion Domain (MDD) theory of Ar loss, based on the 40Ar/39Ar method, has been used to obtain thermal histories, over tens of millions of years, in the range 500 °C to near-surface temperatures, of alkali feldspars from slowly cooled
Publikováno v:
Proceedings of the National Academy of Sciences. 96:3479-3485
Catalysis at organophilic silica-rich surfaces of zeolites and feldspars might generate replicating biopolymers from simple chemicals supplied by meteorites, volcanic gases, and other geological sources. Crystal–chemical modeling yielded packings f