Mathematics – Logic
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91..281m&link_type=abstract
(Lunar and Planetary Institute, NASA, AAS, et al., Lunar and Planetary Science Conference, 17th, Houston, TX, Mar. 17-21, 1986)
Mathematics
Logic
1
Geochronology, Igneous Rocks, Planetary Evolution, Earth Crust, Ontario, Tectonics, Venus Surface
Scientific paper
The Michipicoten Greenstone Belt extends for about 150 km ENE from the northeastern angle of Lake Superior. In common with many other Archean greenstone belts, it is characterized by generally steep bedding dips and a distribution of major lithologic types suggesting a crudely synclinal structure for the belt as a whole. Detailed mapping and determination of structural sequence demonstrates that the structure is much more complex. The Archean history of the belt includes formation of at least three regionally significant cleavages, kilometer-scale overturning, extensive shearing, and diabase intrusion. Most well defined, mappable 'packages' of sedimentary rocks appear to be bounded by faults. These faults were active relatively early in the structural history of the belt, when extensive overturning also occurred. Steepening of dips, NW-SE shortening, development of steep NE cleavage, and pervasive shearing all postdate the early faulting and the regional overturning, obscuring much of the detail needed to define the geometry of the earlier structures. The results obtained so far suggest, however, that the Michipicoten Greenstone Belt underwent an early stage of thrusting and associated isoclinal folding, probably in a convergent tectonic environment.
McGill George E.
Shrady Catherine H.
No associations
LandOfFree
Evidence for a complex archean deformational history; southwestern Michipicoten Greenstone Belt, Ontario does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Evidence for a complex archean deformational history; southwestern Michipicoten Greenstone Belt, Ontario, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence for a complex archean deformational history; southwestern Michipicoten Greenstone Belt, Ontario will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1150553