Dr. Alison Leitch

Geophysical Signals of Reducing Springs (Bay of Islands Ophiolite)


Students: Stephanie Abbott, Nicholas Lynch, Linden Ernst


The Tablelands massif in western Newfoundland is part of the Bay of Islands Ophiolite, segments of the Earth’s upper mantle which were thrust onto the surface when the island was assembled. Ground water interacting with these unusual rocks results in the production of unusually alkaline spring water, and the production of magnetite. Magnetic and electrical surveys are thus able to map ground water flow through invisible fracture systems, and detect springs for geochemical studies. The Tablelands is a Mars analogue site: these reactions may occur on the Red Planet.

Outcomes:

BSc Hons: Linden Ernst (2012) “Self-Potential and Magnetic Detection of a Reducing Spring”
BSc Hons: Nicholas Lynch (2016) “Geophysical detection of reducing springs using magnetics and a newly developed self potential system” *(Peterman prize for best thesis, 2016.)
BSc Hons: Stephanie Abbott (2018) “Magnetic signature and petrography of serpentinized fractures in the Tablelands ophiolite”

Lynch, N. and Leitch, A.M. (2018) “Magnetic and Electrical Surveys in the Bay of Islands Ophiolite, Newfoundland: New Methods for Detecting Faults and Springs” (in prep for Earth Planetary Research Letters)

Contact

Earth Sciences

230 Elizabeth Ave, St. John's, NL, CANADA, A1B 3X9

Postal Address: P.O. Box 4200, St. John's, NL, CANADA, A1C 5S7

Tel: (709) 864-8000