Interpretation of Regional Geophysical Data Acquired at the Bathurst Mining Camp, Canada
Main Article Content
Abstract
The Bathurst Mining Camp is a major base-metal mining district in New Brunswick, Canada that was a focus area for the Geological Survey of Canada Targeted Geoscience Initiative Phase 3 project. As part of this project, more than 3500 gravimetric observations were acquired in the Bathurst Mining Camp, with an average spacing of 1-2 km, in 2006. The gravimetric data was reduced for an average crustal density value of 2.77 g/cm3 to obtain the Bouguer anomaly, which was analyzed and used to obtain 2.5D gravity models along five transects crossing the Bathurst Mining Camp. As a result of gravity modeling, a model of the general geometry of the main geological groups of the Bathurst Mining Camp (Fournier, California Lake, Tetagouche, and Miramichi) was obtained, which suggests that the Nine Mile Syncline is an open fold, and the Tetagouche Anticline is a gentle fold. Both folds are non-cylindrical and inclined, with their axial planes dipping in the 293° N direction: the angle of vergence of the folds increases towards the northeast of their axes. The structures under the Tetagouche Anticline axis gradually get deeper towards the Northeast reaching a maximum depth of 4 km. The depth of the structures modeled under the axis of the Nine Mile Syncline varies between 2 and 9 km, the deepest part being towards the center of the Bathurst Mining Camp; towards the northeast of its axis, the structures reach an intermediate depth of 4 km while towards the southwest they are 2 km deep on average.
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
References
Goodfellow, W. D. (2007). Mineral deposits of Canada: A synthesis of major deposit-types, district metallogeny, the evolution of geological provinces, and exploration methods. Geological Association of Canada, Mineral Deposits Division, Special Publication.
Goodfellow, W. D., Mccutcheon, S. R. and Peter, J. M. (2003). Massive sulfide deposits of the Bathurst mining camp, New Brunswick, and northern Maine. Economic Geology Monograph Series doi: https://doi.org/10.5382/Mono.11
Goodfellow, W. D., Peter, J. M., Winchester, J. A. C. R. and van Staal, C. R. (2003). Ambient Marine Environment and Sediment Provenance during Formation of Massive Sulfide Deposits in the Bathurst Mining Camp: Importance of Reduced Bottom Waters to Sulfide Precipitation and Preservation. En A. Wayne D. Goodfellow, Steven R. McCutcheon, Jan M. Peter (Eds.) Massive Sulfide Deposits of the Bathurst Mining Camp, New Brunswick, and Northern Maine (pp. 129-156) Society of Economic Geologists. doi: https://doi.org/10.5382/Mono.11.08
Gower, S. and McCutcheon, S. (1997). Siluro-Devonian tectonostratigraphic relationships in the Portage Brook area, northern New Brunswick: implications for timing of deformational events in the Bathurst Mining Camp. Atlantic Geology, 33(1), 19-29. doi: https://doi.org/10.4138/2056
Jacob A. de Roo and Cees R. van Staal, C. R. (1994). Transpression and extensional collapse: Steep belts and flat belts in the Appalachian Central Mobile Belt, northern New Brunswick, Canada. GSA Bulletin, 106(4), 541–552. doi: https://doi.org/10.1130/0016-7606(1994)106<0541:TAECSB>2.3.CO;2
Maus, S. and Dimri, V. (1996). Depth estimation from the scalingpower spectrum of potential fields? Geophysical Journal International, 124(1), 113-120. doi: https://doi.org/10.1111/j.1365-246X.1996.tb06356.x
Thomas, M. D. (2003). Gravity signatures of massive sulfide deposits, Bathurst mining camp, New Brunswick, Canada. En A. Wayne D. Goodfellow, Steven R. McCutcheon, Jan M. Peter (Eds.) Massive Sulfide Deposits of the Bathurst Mining Camp, New Brunswick, and Northern Maine (pp. 799-817) Society of Economic Geologists. doi: https://doi.org/10.5382/Mono.11.36
Ugalde, H., Morris, W. A., and van Staal, C. R. (2019). The Bathurst Mining Camp, New Brunswick: data integration, geophysical modelling, and implications for exploration. Canadian Journal of Earth Sciences, 56(5), 433-451. doi: https://doi.org/10.1139/cjes-2018-0048
van Staal, C. R. (1986). Preliminary results of structural investigations in the Bathurst Camp of northern New Brunswick. Geological Survey of Canada, Paper, 193-204. doi: https://doi.org/10.4095/120366
van Staal, C. R., and Williams, P. F. (1984). Structure, origin, and concentration of the Brunswick 12 and 6 orebodies. Economic Geology, 79(7), 1669-1692. doi: https://doi.org/10.2113/gsecongeo.79.7.1669
van Staal, C. R., Fyffe, L. R., Langton, J. P., and McCutcheon, S. R. (1992). The Ordovician Tetagouche Group, Bathurst Camp, northern New Brunswick, Canada; history, tectonic setting and distribution of massive-sulfide deposits. Exploration and Mining Geology, 1(2), 93-103.
van Staal, C. R., Wilson, R. A., Rogers, N., Fyffe, L. R., Langton, J. P., McCutcheon, S. R. and Ravenhurst, C. E. (2003). Geology and tectonic history of the Bathurst Supergroup, Bathurst Mining Camp and its relationships to coeval rocks in southwestern New Brunswick and adjacent Maine - A synthesis. En A. Wayne D. Goodfellow, Steven R. McCutcheon, Jan M. Peter (Eds.) Massive Sulfide Deposits of the Bathurst Mining Camp, New Brunswick, and Northern Maine (pp. 37-60) Society of Economic Geologists. doi: https://doi.org/10.5382/Mono.11.03