skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: YM111-PD-abq-knowles.

Abstract

Abstract not provided.

Authors:
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1268233
Report Number(s):
SAND2007-0826C
524186
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the no event held February 5, 2007 in albuquerque, NM.
Country of Publication:
United States
Language:
English

Citation Formats

Knowles, Mary Kathryn. YM111-PD-abq-knowles.. United States: N. p., 2007. Web.
Knowles, Mary Kathryn. YM111-PD-abq-knowles.. United States.
Knowles, Mary Kathryn. Thu . "YM111-PD-abq-knowles.". United States. doi:. https://www.osti.gov/servlets/purl/1268233.
@article{osti_1268233,
title = {YM111-PD-abq-knowles.},
author = {Knowles, Mary Kathryn},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 2007},
month = {Thu Feb 01 00:00:00 EST 2007}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • Abstract not provided.
  • The Knowles Limestone in northwestern Louisiana was deposited in a warm, very shallow sea on a carbonate ramp. Depositional and diagenetic environments suggest a tropical to subtropical humid climate. Four major depositional settings were present: a restricted tidal flat, a restricted to open lagoon, a reef flat, and a reef core. Restricted tidal-flat deposits include algal-laminated mudstones, wackestones, and bindstones; dolostones; and mudstones where algae and mollusks were abundant with minor echinoderms and bryozoans. Mostly wackestones and rarely packestones were deposited in the lagoon. Oysterlike bivalves and calcareous algae were very common in the lagoon, with coral, hydrozoans, echinoderms, andmore » bryozoans occasionally abundant. Bioturbation and dolomitization are very common in the tidal flat and lagoonal deposits. Principal contributors to the reef framework were corals, stromatoporoids, and encrusting algae which reflect ecological succession. In the reef-flat environment, oncoidal-skeletal wackestones to packstones were deposited. Rarely, they attained bindstone fabric encrusted by codiacean algae. Reef development was ended by prograding tidal-flat deposits. The Knowles sediments display diagenetic signatures from marine phreatic, meteoric phreatic, fluid mixing, subaerial, basinal fluid expulsion, and tectonic stages of diagenetic alteration. Among the Knowles sediments, supratidal dolostones possess best porosity and permeability, but residual hydrocarbon saturation is nil.« less
  • The Knowles Limestone is an upper unit of the Cotton Valley Group, and in Milam County, Texas, it is approximately 350 ft (100 m) thick, consisting of shales, terrigenous dolomitic limestones, grainy limestones, and algal boundstones with stromatoporoids and corals. The boundstones represent an elongate, wave resistant, encrusted skeletal patch reef which probably developed on a subtle salt-generated topographic high. The reef appears to be slightly more than 1 mi (2 km) across in its narrowest lateral dimension as determined by facies correlations of three cored wells in the study area. Reef core boundstones and reef talus were consistently presentmore » downdip, and lagoonal to tidal-flat facies were common updip throughout Knowles deposition. The reef organisms eventually became overwhelmed with terrigenous sediment transported downdip as the tidal-flat environment prograded over the lagoonal, reef talus and reef core facies at the end of Knowles deposition. Early dolomitization of tidal fault and lagoonal facies has created local porous zones in some of these rocks. However, the reef, per se, is cemented by sparry calcite and is not a potential reservoir facies.« less
  • Electron-yield XAFS measurements using the NSLS were made on e-beam evaporated Co/Pd multilayers with various sublayer thicknesses and different thickness ratios of Co to Pd sublayers. The Co K-edge and the Pd K-edge XAFS data were obtained for the Co/Pd multilayers with sublayer thicknesses of 3[Angstrom]/ 4[Angstrom], 15[Angstrom]/4[Angstrom], 3[Angstrom]/15[Angstrom], 2.1[Angstrom]/13.5[Angstrom], and 2.2[Angstrom]/4.5[Angstrom]. Fourier transforms of Co K XAFS for most samples show a splitting of major peak, and the magnitude ratio of these split peaks varies systematically with the thickness ratio of the Pd sublayer to the Co sublayer, whereas the Fourier transforms of the Pd K XAFS for themore » same samples do not show a splitting of peaks. As a preliminary analysis, the Co K XAFS and the split peaks in the Fourier transform for the Co/Pd(3[Angstrom]/4[Angstrom]) case were simulated by using the FEFF calculations, and the Co K XAFS and the major peak in the fourier transform for the Co/Pd(15[Angstrom]/4[Angstrom]) case were also simulated consistently.« less
  • Carbon monoxide chemisorption on transition metal surfaces has been one of the most extensively studied in surface science in past years due to its importance in a variety of catalytic processes, especially, automotive catalytic converters using Pt or Pd. The authors have performed ab initio studies to understand the electronic and geometric aspects of the Pd-CO bond in small carbonyl clusters and the CO covered (2 x 1)p2mg superstructure of the Pd(110) surface. They have used the standard quantum chemistry package Gaussian to study the former system and a LDA (local density approximation) formalism using ab initio pseudopotentials and amore » plane wave basis to study the latter. The latter results are preliminary; the authors intended to study thicker slabs in the future. The organization of the paper is as follows. The authors describe the methods used in their calculation in Sec. 2. In Sec. 3, they present results and discussion; here, they first look at the smallest possible clusters, viz, Pd{sub 2} and PdCO, take a brief look at the orbital chemistry involved and then move on to the study of the CO covered Pd(110) surface and examine the geometry of the near equilibrium structure.« less