2005
DOI: 10.1029/154gm03
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Complex Proterozoic crustal assembly of southwestern North America in an arcuate subduction system:Tthe Black Canyon of the Gunnison, southwestern Colorado

Abstract: The dominant orogenic fabric in Proterozoic rocks of the southwestern U.S. includes a series of NE-striking shear zones that are commonly interpreted as suture zones across which blocks of juvenile crust were assembled to the southern margin of Laurentia. New structural and geochronological data from southwestern Colorado suggest that fabrics related to assembly of tectonostratigraphic terranes in this area strike northwest. The NW-striking foliations represent deformation at ca. 10-20 km paleodepths (ca. 1.77… Show more

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Cited by 20 publications
(30 citation statements)
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“…1800 Ma until ca. 1600 Ma (Karlstrom and Bowring, 1988, and references therein;Aleinkoff et al, 1993;Hawkins et al, 1996;Chamberlain, 1998;Foster et al, 1999;Shaw et al, 2001;Tyson et al, 2002;Cavosie and Selverstone, 2003;Iriondo et al, 2004;Jessup et al, 2005Jessup et al, , 2006. Hill and Bickford (2001) and , however, have argued that the felsic component of bimodal Paleoproterozoic volcanic rocks and their associated granitic plutons in much of southern Laurentia were not formed in arcs, but rather were derived by rift-related melting of pre existing continental crust, a conclusion strongly disputed by Karlstrom et al (2007) and defended by .…”
Section: Introductionmentioning
confidence: 94%
“…1800 Ma until ca. 1600 Ma (Karlstrom and Bowring, 1988, and references therein;Aleinkoff et al, 1993;Hawkins et al, 1996;Chamberlain, 1998;Foster et al, 1999;Shaw et al, 2001;Tyson et al, 2002;Cavosie and Selverstone, 2003;Iriondo et al, 2004;Jessup et al, 2005Jessup et al, , 2006. Hill and Bickford (2001) and , however, have argued that the felsic component of bimodal Paleoproterozoic volcanic rocks and their associated granitic plutons in much of southern Laurentia were not formed in arcs, but rather were derived by rift-related melting of pre existing continental crust, a conclusion strongly disputed by Karlstrom et al (2007) and defended by .…”
Section: Introductionmentioning
confidence: 94%
“…1680-1600 Ma Mazatzal orogenies (Karlstrom and Bowring, 1988;Bowring and Karlstrom, 1990;Whitmeyer and Karlstrom, 2007), which produced a >1000-kmwide zone of largely juvenile crust with some intermixed older crustal components ( Fig. 1) (Hawkins et al, 1996;Hill and Bickford, 2001;Jessup et al, 2005;Bickford and Hill, 2007;Whitmeyer and Karlstrom, 2007). These Paleoproterozoic accretionary events were followed by an enigmatic trans-Laurentian magmatic event involving widespread granitic magmatism ca.…”
Section: Introductionmentioning
confidence: 98%
“…The Black Canyon succession consists of quartzrich metasedimentary rocks, amphibolite, and schists that are distinct from the metavolcanic Dubois and Cochetopa successions (Hansen and Peterman, 1968;Hansen, 1971Hansen, , 1981Bickford and Boardman, 1984;Jessup et al, 2005Jessup et al, , 2006. In the Black Canyon of the Gunnison, quartzofeldspathic paragneisses locally preserve primary structures such as bedding, ripple marks, and cross-bedding.…”
Section: Basement Assemblagesmentioning
confidence: 97%
“…Paragneisses commonly grade into subordinate amounts of pelitic schist with varying mineral assemblages. Age data suggest that the Black Canyon succession is coeval with the Cochetopa succession (Bickford et al, 1989b;Jessup et al, 2006), and Jessup et al (2005) proposed that the contact between rocks of the Dubois and Black Canyon successions was originally depositional. In general, however, structural and stratigraphic relationships between the three basement successions are not well understood at the regional scale (Bickford et al, 1989b).…”
Section: Basement Assemblagesmentioning
confidence: 98%
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