2014 GSA Annual Meeting in Vancouver, British Columbia (1922 October 2014)
Paper No. 127-23
Presentation Time: 9:00 AM-6:30 PM


VANDIVIER, Connor J. and CLARK, Christine M., Dept. of Geography and Geology, Eastern Michigan University, 203 Strong Hall, Ypsilanti, MI 48197, cvandivi@emich.edu

Tourmaline is a complex borosilicate mineral group with over 30 species currently approved by the IMA. Due to its complex chemistry and difficulties with full chemical analysis, assumptions are commonly made during formulae normalizations, often with little corroborative support. These include Fe2+/Fe3+ ratios and the amounts of the light elements Li, B and H. These assumptions can lead to misidentification of tourmaline species and the resulting interpretation of the geochemical environment of formation. Past research has shown the stereochemistry of the B-site to be sensitive to variations in chemistry, responding to the occupancy of the Y- and Z-sites in particular. We are further investigating this relationship to better understand why the (BO3) triangle responds to the chemistry of the octahedral sites, and what elements and sites have the strongest effect. This will allow crystallographic data to support assumptions made during the tourmaline normalizations. This information can also be used to validate, identify, and differentiate similar species among the tourmaline group.

2014 GSA Annual Meeting in Vancouver, British Columbia (1922 October 2014)
General Information for this Meeting
Session No. 127--Booth# 184
Mineralogy/Crystallography (Posters)
Vancouver Convention Centre-West: Exhibition Hall C
9:00 AM-6:30 PM, Monday, 20 October 2014

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