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- W251562341 abstract "Jointing is a characteristic feature of the Platteville Formation. A total of 1,577 joint orientations were measured at fourteen localities in east-central Minnesota and west-central Wisconsin. All the joints are vertical with north-south to east-west exposure orientations. Four major joint sets including a longitudinal, a crosscutting, and two diagonal sets are identifiable for over 75% of the localities. The analysis of rose diagrams superimposed on the site map help to recognize a trend in joint patterns from location to location. The localities east and south of the Hudson-Afton horst appear to have similar trend and development of joint patterns. The orientations of the major joint sets are: N10E, N60E, N40W, and N85W. The localities west of the Hudson-Afton horst differ from the east and south localities in both trend and development of joint patterns. The approximate orientations of the major joint sets are: N05W, N50E, N45W, and N80W. The joint pattern appears to be related to the structural trend of the Hudson-Afton horst. The horst, an associated feature of the Midcontinental rift, is an uplifted block of Precambrian igneous and sedimentary rocks bounded by faults. These faults are a possible cause for the jointing. The faults strike at an azimuthmore » of approximately N22E which correlates well with the idealized azimuth for the maximum principal stress as deduced from the rose diagrams.« less" @default.
- W251562341 created "2016-06-24" @default.
- W251562341 creator A5015783771 @default.
- W251562341 date "1994-04-01" @default.
- W251562341 modified "2023-09-26" @default.
- W251562341 title "Jointing in the Ordovician Platteville Formation on either side of the Hudson-Afton horst in Wisconsin and Minnesota" @default.
- W251562341 hasPublicationYear "1994" @default.
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