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Collapse Structures Related to Evaporites of the Prairie Formation, Saskatchewan

1964; Geological Society of America; Volume: 75; Issue: 4 Linguagem: Inglês

10.1130/0016-7606(1964)75[307

1943-2674

George de Mille, J. R. SHOULDICE, Harry W. Nelson,

Groundwater and Isotope Geochemistry

Research Article| April 01, 1964 Collapse Structures Related to Evaporites of the Prairie Formation, Saskatchewan G De MILLE; G De MILLE Imperial Oil Limited, Calgary, Alberta, Canada Search for other works by this author on: GSW Google Scholar J. R SHOULDICE; J. R SHOULDICE Imperial Oil Limited, Calgary, Alberta, Canada Search for other works by this author on: GSW Google Scholar H. W NELSON H. W NELSON Imperial Oil Limited, Calgary, Alberta, Canada Search for other works by this author on: GSW Google Scholar GSA Bulletin (1964) 75 (4): 307–316. https://doi.org/10.1130/0016-7606(1964)75[307:CSRTEO]2.0.CO;2 Article history received: 25 Feb 1963 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation G De MILLE, J. R SHOULDICE, H. W NELSON; Collapse Structures Related to Evaporites of the Prairie Formation, Saskatchewan. GSA Bulletin 1964;; 75 (4): 307–316. doi: https://doi.org/10.1130/0016-7606(1964)75[307:CSRTEO]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The salt deposits of the Middle Devonian Elk Point Group extend from North Dakota to Canada's Northwest Territories. Subsurface knowledge is best in Saskatchewan. Here the most wide-spread of these deposits, the Prairie Formation, reaches a maximum thickness of 670 feet and contains the extensive potash ores now being developed. The Prairie salt beds overlie thin carbonates containing reefs. These sediments form part of a depositional sequence starting with thin shales and grading upward to carbonates, followed by evaporites climaxing in potash salts and capped with red beds. This sequence is overlain by similar depositional units in which, however, evaporites are less well developed.Because of the excellent subsurface control in this vast gently dipping shelf area, it is possible to recognize structural features that might go unnoticed in more complex areas. Structural highs due to salt flowage are unknown. There are, however, many structural lows which are due to removal of salt by subsurface leaching.The Rosetown low, covering about 144 sections, is one of the larger features of this type.The Hummingbird trough is a complex structure. Seismic and subsurface information indicate that there have been repeated episodes of salt leaching accompanied by downwarping and compensation in overlying strata.It is impossible to escape the conclusion that the Prairie evaporites have been severely modified by subsequent solution. The unusual structures resulting from this phenomenon may be present but unrecognized in other salt basins. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.