Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Charles V. Guidotti"'
Publikováno v:
American Mineralogist. 92:954-965
Natural Al-saturated chlorite having a wide range of Mg:Fe ratios [Mg/(Mg + Fe) = 0.357 to 0.943] was studied to determine the effect of Mg-Fe substitution on the unit-cell parameters. With a nearly constant Al content [Al T /(Al T + Mg + Fe) = 0.362
Publikováno v:
Journal of Metamorphic Geology. 24:55-73
In the low-pressure, high-temperature metamorphic rocks of western Maine, USA, staurolite porphyroblasts grew at c. 400 Ma, very late during the regional orogenesis. These porphyroblasts, which preserve straight inclusion trails with small thin-secti
Autor:
Francesco P. Sassi, Charles V. Guidotti, James G. Blencoe, Pier Francesco Zanazzi, Paola Comodi
Publikováno v:
Scopus-Elsevier
Plusieurs chercheurs se sont penches sur les mecanismes de transformation d'un shale en ardoise, furent-ils mecaniques, physiques ou chimiques. Nous considerons ici certains aspects qui ont echappe aux auteursanterieurs. Plus precisement, nous evaluo
Publikováno v:
American Mineralogist. 87:514-522
Synchrotron micro-XANES (X-ray absorption near-edge structure) spectroscopy (SmX) was used to measure Fe 3 + and Fe 2 + distribution among minerals in standard thin sections with an X-ray beam size of 10 x 15 μm. Measurements were made at beamline X
Autor:
Darrell J. Henry, Charles V. Guidotti
Publikováno v:
American Mineralogist. 87:375-382
An extensive natural biotite data set from western Maine constrains the temperature and crystal-chemical controls on the saturation Ti levels in biotites from metapelites. The geologically and petrologically well-characterized metamorphic terrain ass
Publikováno v:
Reviews in Mineralogy and Geochemistry. 46:413-448
Micas have been studied for many important and highly interesting reasons by a wide range of workers, e.g., engineers, physicists, chemists, and Earth scientists. Our focus includes only aspects related to the Earth sciences, specifically the mineral
Autor:
Heike Rothe, Richard L. Hervig, Michael Wiedenbeck, Edward S. Grew, Carl A. Francis, Kurt M. Ferguson, Jeremy S. Delaney, Rick L. Paul, Martin G. Yates, Laura R. Cross, David Robertson, William P. Leeman, John Husler, M. Darby Dyar, Anne V. McGuire, Dieter Rhede, Ian J. Richards, Charles V. Guidotti, John M. Hughes
Publikováno v:
Geostandards and Geoanalytical Research. 25:441-463
The quantitative determination of light element concentrations in geological specimens represents a major analytical challenge as the electron probe is generally not suited to this task. With the development of new in situ analytical techniques, and
Autor:
Charles V. Guidotti
Publikováno v:
The Canadian Mineralogist. 38:995-1006
Solar & Brown (1999) (S & B) wrote an interesting, highly provocative paper that could lead unwary readers to accept uncritically a tectonometamorphic history for western Maine that is somewhat controversial. Moreover, some aspects of their paper, wh
Autor:
Martin G. Yates, Andreas Ertl, Charles V. Guidotti, M. Darby Dyar, John M. Hughes, Charles K. Shearer, Edward S. Grew
Publikováno v:
The Canadian Mineralogist. 38:861-868
The substitution of [4] B for [4] Si in tourmaline has been the source of much discussion. A sample of olenite from Stoffhutte, Koralpe, Styria, Austria has been found to contain more than one [4] B per formula unit of 31 (O,OH,F), demonstrating that
Autor:
Carl A. Francis, Laura R. Cross, M. Darby Dyar, John B. Brady, Katherine M. Wearn, Michael A. Wise, Charles V. Guidotti, Kathleen E. Johnson, Daniel P. Core, J. David Robertson
Publikováno v:
European Journal of Mineralogy. 11:281-294