Influence of Potsdam sandstone on the trace element signatures of some 19th-century American and Canadian glass: Redwood, Redford, Mallorytown, and Como-Hudson

摘要

Potsdam sandstone from quarries and outcrops near 19th-century glassworks sites in Redwood, NY, and Saranac, NY, Mallorytown, ON, and Como and Hudson, QC, commonly contains >97% silica, so in terms of its purity can compete with other historical producers of silica sand (e.g., Cheshire quarzite, MA; southern New,Jersey sand). Exploratory analysis of trace element data using multidimensional scaling (MDS) shows chat. geographically distinct sources of Potsdam sandstone can be distinguished from one another and from competing sources of silica sand, particularly in terms of high field strength elements (e.g., Nb, Y, Ti, Zr), the rare earth elements, and radioactive elements (U, Th), and this geochemical signature is carried through to the glass it wws used to manufacture. Other trace elements (e.g., Ba, Sr, Rb)are concentrated in various batch ingredients (e.g., limestone, alkali fluxes). The Hf/Nb, La/Ce, Nb/Th, and La/Zr ratios for each type of glass and nearby Potsdam sandstone sources cluster together in distinct. fields on MDS plots. These data confirm the use of Potsdam sandstone in these important historical glassworks, and show that, except for material sampled from neighboring communities (Mallorytown and Redwood), trace elements can be used to identify specific sources of silica historically used by the glassmaking industry. (C) 2008 Wiley Periodicals, Inc.