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Scholars Day 2005, Wednesday, April 13

Dolomitization of the Onondaga Limestone Along the Clarendon Linden Fault in Western New York

Dolomitization after lithification of carbonate rocks is achieved through fluid flow and a replacement of pre-existing carbonate components producing saddle dolomite. The resulting dolomite is typically lower in Mg then pure dolomite. In this study, dolomitization is described along the Clarendon Linden Fault (CLF) system in western New York. Samples of the Onondaga limestone were collected at six locations east and west of the fault zone, and at 4 locations along the fault zone. Samples were powdered and dissolved in concentrated HNO3. Solutions were analyzed by ICP to determine the concentration of Ca, Mg and selected trace elements to evaluate the dolomitization process. Samples collected west of the CLF have Mg concentrations of 0.1 to 0.14% of the sum of Ca + Mg. Along the fault zone and east of the CLF, Mg concentrations rise to 43.8% to 46.8%. These results are indicative of the formation of a saddle dolomite.

Presenter: David Cannon (Undergraduate Student)
Topic: Geology
Location: 218 Lennon
Time: 1:45 pm (Session III)

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