Geotherms of Lake Superior Copper Country

Research Article| December 30, 1923 Geotherms of Lake Superior Copper Country ALFRED C. LANE ALFRED C. LANE Search for other works by this author on: GSW Google Scholar Author and Article Information ALFRED C. LANE Publisher: Geological Society of America Received: 20 Feb 1923 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 1923 Geological Society of America GSA Bulletin (1923) 34 (4): 703–720. https://doi.org/10.1130/GSAB-34-703 Article history Received: 20 Feb 1923 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation ALFRED C. LANE; Geotherms of Lake Superior Copper Country. GSA Bulletin 1923;; 34 (4): 703–720. doi: https://doi.org/10.1130/GSAB-34-703 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 SummaryThe rate of increase of temperature in the Lake Superior mines averages about one degree per 105 feet, but is greater in depth, about one degree Fahrenheit per 90 feet. While the mean air temperature in Calumet is about 39 degrees Fahrenheit, the mean ground temperature is 43 degrees (42.6 degrees Fahrenheit), owing to the blanketing effect of the snow in winter.This increase of gradient is due to an increase of surface temperature about 10,000 years ago; for, by taking the gradient below 4,000 feet and producing it to the surface, we find a surface temperature of 32 degrees Fahrenheit, that which the ice bottom may have had. The time since the rise in temperature is found by seeing how much the scale of time may be enlarged in the probability curve connecting the temperature and time for a flow of heat due to a sudden rise of . . . 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.