Joint orientation in Devonian rocks in the northern portion of the lower peninsula of Michigan

Abstract

Research Article| February 01, 1981 Joint orientation in Devonian rocks in the northern portion of the lower peninsula of Michigan TIMOTHY B. HOLST; TIMOTHY B. HOLST 1Department of Geology, University of Minnesota, Duluth, Minnesota 55812 Search for other works by this author on: GSW Google Scholar GARY R. FOOTE GARY R. FOOTE 2Department of Geology, Hope College, Holland, Michigan 49423 Search for other works by this author on: GSW Google Scholar Author and Article Information TIMOTHY B. HOLST 1Department of Geology, University of Minnesota, Duluth, Minnesota 55812 GARY R. FOOTE 2Department of Geology, Hope College, Holland, Michigan 49423 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1981) 92 (2): 85–93. https://doi.org/10.1130/0016-7606(1981)92<85:JOIDRI>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation TIMOTHY B. HOLST, GARY R. FOOTE; Joint orientation in Devonian rocks in the northern portion of the lower peninsula of Michigan. GSA Bulletin 1981;; 92 (2): 85–93. doi: https://doi.org/10.1130/0016-7606(1981)92<85:JOIDRI>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 orientations of 4,787 joints were measured at 43 separate locations in the area from Charlevoix, Michigan, to Alpena, Michigan, and north to the tip of the lower peninsula of Michigan. The sample localities are all in Devonian carbonate rocks and shales of the Michigan Basin. Nearly all of the joints are vertical. At least one major joint set is identifiable at each location, and four major sets are present at more than half of the locations. At 40 of the 43 sample localities, there is a joint set with a strike of about 54 degrees (N54°E); at 35 locations, there is a set striking about 133 degrees (N47°W). At 32 locations, there is a set with a strike of about 92 degrees (N88°W), and a set with a strike of about 2 degrees (NO2°E) is present at 31 sample localities. Mean orientation of any of the four joint sets does vary from location to location but is relatively consistent over the entire area for each of the sets. Fluctuations in mean orientation of any of the joint sets or the presence or absence of the joint sets is independent of formation, lithology, and distance between sample stations.Joint set orientation is independent of the regional strike around the Michigan Basin, which varies from 54 degrees (N54°E) to 114 degrees (N66°W) within the study area. The joint pattern does not appear to be related to structural trends previously postulated to exist in the Precambrian basement of the area. Two of the joint sets may be related to major low-amplitude folds in the Paleozoic strata of the Michigan Basin. In situ stress measurements show the orientation of maximum horizontal compressive stress to be compatible with these joint sets and the folds. 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.