Sarah Richardson

2000 - AMOCO Geophysics Scholarship
1998 - Canadian Society of Petroleum Geologists Undergraduate Scholarship
1997 - Mineralogical Association of Canada Student Prize
1996 - Michael J. Keen Memorial Award
1996 - G.V.Douglas Award

The purpose of this study is to represent folding in the Meguma Terrane of Nova Scotia through a series of balanced cross-sections, that is, cross-sections that are geometrically plausible and may be returned to their original undeformed state through physically reasonable steps. Pre- existing cross-sections of the Meguma do not conform to the principles of balanced cross-section construction, and demonstrate physically improbable fold geometry. The Kink method of cross- section building is an effective tool for modeling Meguma Group strata, as they form parallel folds, maintain constant bed thickness, and have experienced minimal volume loss during deformation. Collection of field data in the Halifax region and use of existing field data from Ecum Secum, Halifax, Mahone Bay, and LaHave areas has resulted in a series of twelve balanced cross-sections. Calculation of shortening from these sections yields an average shortening value of 35.5%. Depth to detachment calculations from the Goldenville-Halifax contact in these sections yields values indicating a Southward dipping plane of detachment, with an average depth of 4769 m in Ecum Secum to an average depth of 9792 in LaHave. Values calculated for depth to detachment correlate with postulated Meguma-base values based on magnetic modelling of the South Mountain Batholith which intrudes the Meguma Group. Thus, in addition to modeling Meguma folding, this study provides data which may give insight into modes of emplacement of the South Mountain Batholith.

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Supervisor: Nick Culshaw