... of mineralogy and petrology, Charles V. Guidotti (1935–2005). These papers were largely derived from a special topical session held in his honor at the 2006 Annual Meetings of the Geological Society of America. The session provided an opportunity for mineralogists and petrologists inspired by Charlie’s example...

...John M. Hughes; Andreas Ertl; M. Darby Dyar; Edward S. Grew; Charles K. Shearer; Martin G. Yates; Charles V. Guidotti Abstract The substitution of [4] B for [4] Si in tourmaline has been the source of much discussion. A sample of olenite from Stoffhütte, Koralpe, Styria, Austria has been found...

...Sang Soo Lee; Stephen Guggenheim; M. Darby Dyar; Charles V. Guidotti Abstract 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...

...Charles V. Guidotti; Francesco P. Sassi; Paola Comodi; Pier F. Zanazzi; James G. Blencoe Abstract Plusieurs chercheurs se sont penchés sur les mécanismes de transformation d’un shale en ardoise, furent-ils mécaniques, physiques ou chimiques. Nous considérons ici certains aspects qui ont...

...Darrell J. Henry; Charles V. Guidotti; Jennifer A. Thomson Abstract The Ti content of biotite can serve as a geothermometer for graphitic, peraluminous metapelites that contain ilmenite or rutile and have equilibrated at roughly 4–6 kbar. The relationship between Ti-content, temperature, and Mg/(Mg...

...Darrell J. Henry; Charles V. Guidotti Abstract 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...

...M. Darby Dyar; Emily W. Lowe; Charles V. Guidotti; Jeremy S. Delaney Abstract 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 × 15 μm...

...Charles V. Guidotti; Francesco P. Sassi 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 mineralogy...

...Charles V. Guidotti § E-mail address : guidotti@maine.maine.edu 25 05 2000 30 09 1999 © 2000 Mineralogical Association of Canada 2000 Solar & Brown (1999) (S & B) wrote an interesting, highly provocative paper that could lead unwary readers to accept...

...Charles V. Guidotti; Francesco P. Sassi; Paola Comodi; Pier Francesco Zanazzi; James G. Blencoe Abstract The incorporation of Fe, Mg, and Si into muscovite in response to increase of pressure (P) has long been recognized. In the context of the appropriate mineral assemblages, the extent...

...Erich S. Bloodaxe; John M. Hughes; M. Darby Dyar; Edward S. Grew; Charles V. Guidotti Abstract Nine tourmaline crystals for which major and minor element composition data are available have been examined by single-crystal X-ray structure refinement. The single crystals were then analyzed for major...

...M. Darby Dyar; Charles V. Guidotti; Daniel P. Core; Katherine M. Wearn; Michael A. Wise; Carl A. Francis; Kathleen Johnson; John B. Brady; J. David Robertson; Laura R. Cross GeoRef, Copyright 2004, American Geological Institute. 1999 ...

...Charles V. Guidotti; Francesco P. Sassi GeoRef, Copyright 2004, American Geological Institute. 1998 ...

...M. Darby Dyar; Marjorie E. Taylor; Timothy M. Lutz; Carl A. Francis; Charles V. Guidotti; Michael Wise Abstract We report here the results of a series of inclusive chemical characterizations, including all elements except oxygen, for a suite of 54 tourmaline samples. A combination of analytical...

...Antonella Zane; Raffaele Sassi; Charles V. Guidotti © 1998 Mineralogical Association of Canada 1998 Mineralogical Association of Canada ...

...David P. West Jr; Charles V. Guidotti; Daniel R. Lux Abstract New 40 Ar/ 39 Ar mineral ages from rocks collected west of Penobscot Bay, Maine, indicate this region was regionally deformed, metamorphosed to amphibolite facies conditions, and intruded by plutons in Silurian times rather than...

...Charles V. Guidotti; Martin G. Yates; M. Darby Dyar; Marjorie E. Taylor Abstract The Fe 3+ /Fe 2+ ratio of muscovite from typical metapelites is large. It reflects the opaque mineral assemblages in the rocks but appears to be independent of metamorphic grade. After correction for Fe 3+ , the Mg/(Mg...

...Francesco P. Sassi; Charles V. Guidotti; Milan Rieder; Renzo De Pieri GeoRef, Copyright 2004, American Geological Institute. 1994 ...

...Milan Rieder; Charles V. Guidotti; Francesco P. Sassi; Zdenek Weiss GeoRef, Copyright 2004, American Geological Institute. 1992 ...