Dillon cutoff-Basement-involved tectonic link between the disturbed belt of

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• journal_title：Geology
• Contributor：J. Michael O'Neill ; Christopher J. Schmidt ; Paul W. Genovese
• Publisher：Geological Society of America
• Date：1990-
• Format：text/html
• Language：en
• Identifier：10.1130/0091-7613(1990)018<1107:DCBITL>2.3.CO;2
• journal_abbrev：Geology
• issn：0091-7613
• volume：18
• issue：11
• firstpage：1107

摘要

<p id="p-1">The front of the Cordilleran fold and thrust belt in western Montana follows the disturbed belt in the north, merges with the southwest Montana transverse zone in the west-central part of the region, and in southwestern Montana is marked by a broad zone characterized by complex interaction between thrust belt structures and basement uplifts. The front margin of the thrust belt in Montana reflects mainly thin-skinned tectonic features in the north, an east-trending lateral ramp that curves southwest in the central part into the Dillon cutoff, an oblique-slip, thick-skinned displacement transfer zone that cuts through basement rocks of the Lima recess, and a zone of overlap between thin- and thick-skinned thrusts in extreme southwestern Montana. The transverse ramp and basement-involved thrust faults are controlled by Proterozoic structures. p>