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Major lineaments and the Lake Erie‐Maryland crustal block
Author(s) -
Lavin Peter M.,
Chaffin David L.,
Davis Willard F.
Publication year - 1982
Publication title -
tectonics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.465
H-Index - 134
eISSN - 1944-9194
pISSN - 0278-7407
DOI - 10.1029/tc001i005p00431
Subject(s) - lineament , geology , precambrian , block (permutation group theory) , ordovician , crust , tectonics , seismology , paleontology , geometry , mathematics
Analyses of regional gravity and magnetic patterns, LANDSAT images and geological information have revealed two major lineaments crossing western Pennsylvania and parts of surrounding states. These lineaments are inferred to be expressions of fracture zones which penetrate deeply into the crust and possibly the upper mantle. The extensions of the Tyrone‐Mt. Union and the Pittsburgh‐Washington lineaments bound a distinct crustal block (Lake Erie‐Maryland block) over 100 km wide and probably more than 600 km in length. Evidence exists for the lateral displacement of this block at least 60 km northwestward during late Precambrian to Lower Ordovician time. Subsequent movements have been mainly vertical with respect to neighboring blocks.