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Bulletin of Engineering Geology and the Environment

, Volume 78, Issue 6, pp 3863–3874 | Cite as

Subsurface fracture distribution and its correlation with the shape and thickness of the Lac du Bonnet batholith

  • Richard Everitt
Original Paper
  • 139 Downloads

Abstract

The Lac du Bonnet batholith (LDBB) is an Archean pluton in the Superior Province in southeastern Manitoba and formerly the site of the Underground Research Laboratory operated by Atomic Energy of Canada Limited. Batholith-scale investigations were conducted there between the late 1970s and 2005 into the Canadian concept of used nuclear fuel disposal in crystalline rocks of the Canadian Shield. A review of legacy data from this period has revealed that the distribution of the fracture network can be related directly to the thickness of the intrusion, as inferred from the model of the base of the batholith. Fractures have preferentially developed in the shallow and thinner sill-like western remnant of the batholith and, in comparison, they are suppressed within and over its deep root. Fracture orientations, frequency and continuity as seen at the surface are not characteristic of the fractures within the batholith interior, even at relatively shallow depths. A substantial volume of unfractured granite has been preserved despite the LDBB’s great age and its exposure to several cycles of loading and unloading, as revealed by the regional stratigraphic record and a unique apatite fission track dating profile. The LDBB is not a one-of-a-kind anomaly, and similar fracture/host rock relationships can be found in the literature. Based on the data reported here, it can be recommended that site models for any continuance of underground nuclear waste storage define the volume distribution of the host rock and its internal structure as these may serve as guides for subsurface exploration and the development and incremental testing of a conceptual fracture model.

Keywords

Granite batholith Nuclear waste storage Fractures Gravity profile Intact unfractured rock 

Notes

Acknowledgements

This paper is an unfunded project based on published sources. The borehole logs and the shaft mapping were for the most part conducted in the 1980s and 1990s at a time when this work was a component of the Canadian Nuclear Fuel Waste Management Program, and was jointly funded by AECL and Ontario Hydro under the auspices of the CANDU Owners Group. Surface mapping, geophysical surveys, the placement and logging of boreholes collared at the surface and the interpretation and modelling of the results were the responsibility of the group operating mostly from the Whiteshell Laboratories. The author of this manuscript was the site geologist at the URL, responsible for subsurface mapping, borehole placement and logging and construction and reiterative testing of the site geological model.

Appreciation is extended to Paul Thompson, Kirk Osadetz and Hubert Lavallee for their comments. Finally, the author acknowledges the tremendous effort required to complete the original surface mapping, geophysical surveys and the borehole logging, and to the authors of the various geological, hydrogeological, geophysical and geomechanical reports which have been instrumental in the site characterization.

References

  1. Ahern JL, Mrkvicka SR (1984) A mechanical and thermal model for the evolution of the Williston Basin. Tectonics 3(1):79–102CrossRefGoogle Scholar
  2. Baumgartner P, Thompson PM (2007) Twenty plus years of underground research at Canada’s URL. In: Stiopol M (ed) International Symposium on Nuclear Energy SIEN 2007 Nuclear Power - A New Challenge. Romanian Nuclear Energy Association, AREN, Romania, p 651Google Scholar
  3. Beakhouse GP (1991) Winnipeg River subprovince. In: Thurston PC, Williams HR, Sutcliffe RH, Stott GM (eds) Geology of Ontario. Ontario Geol Surv Spec Vol 4, Pt 1, pp 279–302Google Scholar
  4. Brown A, Soonawala NM, Everitt RA, Kamineni DC (1989) Geology and geophysics of the Underground Research Laboratory site, Lac du Bonnet batholith, Manitoba. Can J Earth Sci 26:404–425CrossRefGoogle Scholar
  5. Burwash RA, McGregor CR, Wilson J (1994) Precambrian basement beneath the Western Canada Sedimentary Basin. In: Mossop G, Shetsen I (compilers) Geological atlas of the Western Canada Sedimentary Basin. Can Soc Pet Geol/Alberta Res Counc, Calgary/Edmonton, pp 49–56Google Scholar
  6. Cerny P, Fryer BJ, Longstaffe FJ, Tammemagi HY (1987) The Archean Lac du Bonnet batholith, Manitoba: igneous history, metamorphic effects, and fluid overprinting. Geochim Cosmochim Acta 51:421–438CrossRefGoogle Scholar
  7. Davison CC, Brown A, Gascoyne DR, Stevenson DR, Ophori DU (1996) Understanding large scale groundwater flow to aid in repository siting. In: Int Conf on Deep Geological Disposal of Radioactive Waste. Conf Proc Can Nucl Soc 3-39 to 3-35Google Scholar
  8. Everitt RA (2001) The Influence of Rock Fabric on Excavation Damage in the Lac Du Bonnet Granite. A thesis Submitted to the Faculty of Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy. Department Of Civil and Geological Engineering. University of Manitoba. Winnipeg, ManitobaGoogle Scholar
  9. Everitt RA, Brown A (1995) Geological mapping of AECL Research’s Underground Research Laboratory. A cross section of thrust faults and associated fractures in the roof zone of an Archean Batholith. In: Proc of Fractured and Jointed Rock Masses, a regional conference of the International Society of Rock Mechanics, June 1–6 1992, Granlibakken, CA, vol 1, pp 1–11Google Scholar
  10. Everitt RA, Lajtai EZ (2004) The influence of rock fabric on excavation damage in the Lac du Bonnet granite. In: Chandler N, Guo R, Read R (eds) Rock mechanics results from the Underground Research Laboratory, Canada. Int J Rock Mech Mining Sci Spec Issue 41/8: 1277–1303. http://authors.elsevier.com/sd/article/S1365160904002849. Accessed 25 Feb 2015
  11. Everitt RA, McMurry J, Brown A, Davison C (1996) Geology of the Lac Du Bonnet Batholith, Inside and Out: AECL's Underground Research Laboratory, Southeastern Manitoba. Field Excursion B-5: Guidebook. Geol. Assoc. Can. - Mineral. Assoc. Can. Joint Annual Meeting 1996, Winnipeg, Manitoba, Canada. 1996 May 30. © Copyright Geol. Assoc. Can. Winnipeg ‘96 CommitteeGoogle Scholar
  12. Everitt RA, Brown A, Ejeckam R, Sikorsky R, Woodcock D (1998) Litho-structural layering within the Archean Lac du Bonnet Batholith, at AECL’s Underground Research Laboratory, southeastern Manitoba. J Struct Geol 20(9/10):1291–1304Google Scholar
  13. Feinstein S, Kohn B, Osadetz K, Everitt R, O'Sullivan R (2009) Variable Phanerozoic thermal history in the southern Canadian shield: evidence from an apatite fission track profile at the Underground Research Laboratory (URL), Manitoba. Tectonophysics 475(1):190–199.  https://doi.org/10.1016/j.tecto.2009.01.016
  14. Gerhard LC, Anderson SB, LeFever JA, Carlson CG (1982) Geological development, origin, and energy mineral resources of Williston Basin, North Dakota. AAPG Bull 66:989–1020Google Scholar
  15. Huntington KW, Klepeis KA (2018) Challenges and opportunities for research in tectonics: understanding deformation and the processes that link Earth systems, from geologic time to human time. https://digital.lib.washington.edu/researchworks/handle/1773/40754. Accessed 21 Jan 2018
  16. Kamineni DC, Brown A, Peterman ZE, Stone D (1990a) Radiometric ages, cooling rates and deformation of two granitic plutons in the Superior Province, Canadian Shield, Geological Society of America, 1990 annual meeting, Dallas, TX, October 29-November 1,1990. Geol Soc Am, Abstracts with Programs 22(7):244Google Scholar
  17. Kamineni DC, Stone D, Peterman ZE (1990b) Early Proterozoic deformation in the western Superior Province, Canadian shield. Geol Soc Am Bull 102:1623–1634Google Scholar
  18. Lau JSO, Auger LF, Bisson JG (1987) Subsurface fracture surveys using a borehole television camera and acoustic televiewer. Can Geotech J 24:499–508CrossRefGoogle Scholar
  19. Mossop G, Shetsen I (1994) Geological Atlas of the Western Canada Sedimentary Basin. Can Soc Pet Geol/Alberta Res Counc, Calgary/Edmonton, p 49–56Google Scholar
  20. Nuclear Waste Management Organization (NWMO) (2018) https://www.nwmo.ca/en/Site-selection/About-the-Process. Accessed 26 Sept 2018
  21. Osadetz KG, Kohn BP, O'Sullivan P, Feinstein S, Hannigan PK, Everitt RA, Gilboy CF, Bezys RK, Stasiuk LD (1998) Williston Basin thermotectonics: variations in heat flow and hydrocarbon generation. In Christopher JE, Gilboy CF, Paterson DF, Bend SL (eds) Eighth International Williston Basin Symposium, Saskatchewan Geological Society Special Publication No. 13, p. 147–165Google Scholar
  22. Osadetz KG, Kohn BP, Feinstein S, O’Sullivan PB (2002) Thermal history of Canadian Williston basin from apatite fission-track thermochronology—implications for petroleum systems and geodynamic history. Tectonophysics 349(2002):221–249Google Scholar
  23. Osmani IA (1991) Proterozoic mafic dike swarms in the Superior Province of Ontario. In: Thurston PC, Williams HR, Sutcliffe RH, Stott GM (eds) Geology of Ontario. Ontario Geol Surv Spec Vol 4(1)661–682. OsmaniGoogle Scholar
  24. Parry S, Baynes FJ, Culshaw MG, Eggers M, Keaton JF, Lentfer K, Novotny J, Paul D (2014) Engineering geological models: an introduction: IAEG commission 25. Bull Eng Geol Environ 73:689–706.  https://doi.org/10.1007/s10064-014-0576-x CrossRefGoogle Scholar
  25. Patchett PJ, Ross GM, Gleason JD (1999) Continental drainage in North America during the Phanerozoic from Nd isotopes. Science 283(5402):671–673CrossRefGoogle Scholar
  26. Patchett PJ, Embry AF, Ross GM, Beauchamp B, Harrison JC, Mayr U, Isachsen CE, Rosenberg EJ, Spence GO (2004) Sedimentary cover of the Canadian Shield through Mesozoic time reflected by Nd isotopic and geochemical results for the Sverdrup Basin, Arctic Canada. J Geol 12(1):39–57.  https://doi.org/10.1086/379691 Accessed 31 Dec 2016
  27. Rutqvist J (2015) Fractured rock stress-permeability relationships from in situ data and effects of temperature and chemical-mechanical couplings. GEOFLUIDS 15:48–66.  https://doi.org/10.1111/gfl.12089 CrossRefGoogle Scholar
  28. Short NM (1970) Anatomy of a meteorite impact crater: West Hawk Lake, Manitoba, Canada. Bull Geol Soc Am 81:609–648CrossRefGoogle Scholar
  29. Sikorsky RI (1996) The distributions of subsurface fractures in the rocks at AECL’s Research Areas in the Canadian Shield. Technical Record TR-750, COG 96-241. Scientific Document Distribution Office (SDDO), AECL, Chalk River, Ontario. Canada KOJ H1JOGoogle Scholar
  30. Stephens MB, Follin S, Peterson J, Isaksson H, Christopher J, Simeonov A (2015) Review of the deterministic modelling of deformation zones and fracture domains at the site proposed for a spent nuclear fuel repository, Sweden, and consequences of structural anisotropy. Tectonophysics 653:68-94.  https://doi.org/10.1016/j.tect02015D3.027
  31. Stone D, Kamineni DC, Brown A, Everitt RA (1989) A comparison of fracture styles in two granite bodies of the Superior Province. Can J Earth Sci 26:387–403Google Scholar
  32. Tomsons DK, Lodha GS, Street PJ, Auger JLF (1995) A Bouguer gravity anomaly map and geophysical interpretation of the geometry of the Lac du Bonnet Batholith, Whiteshell Research Area, Southeastern Manitoba. Atomic Energy of Canada Limited, Technical Record TR-633, COG-94-096.Google Scholar
  33. Underwood JR, Guth PL (eds) (1998) Military geology in war and peace. GSA Reviews in Engineering Geology. Military Geology in War and Peace. (James R. Underwood, Jr. and Peter L. Guth eds.). Geol Soc Am 13.  https://doi.org/10.1130/REG13. https://pubs.geoscienceworld.org/books/book/907/military-geology-in-war-and-peace. Accessed 26 Sept 2018. ISBN electronic:9780813758138 Publication date: January 01, 1998
  34. Whitaker SH (1987) Geoscience research for the Canadian nuclear fuel waste management program. Radioact Waste Manage Nucl Fuel Cycle 8:145–196. https://inis.iaea.org/search/search.aspx?orig_q=RN:19002754. Accessed 26 Sept 2018

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.OttawaCanada

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