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Papers by Karl Karlstrom
Geology, 2000
The Rocky Mountains, Colorado Plateau, and Midcontinent, regions of the North American cratonic p... more The Rocky Mountains, Colorado Plateau, and Midcontinent, regions of the North American cratonic platform, display similar styles and patterns of Phanerozoic deformation. In these regions, movement on basement-penetrating faults during the late Paleozoic Ancestral Rockies event and/or ...
Precambrian Research, 1984
Karlstrom, K.E. and Houston, R.S., 1984. The Cheyenne belt: analysis of a Proterozoic suture in s... more Karlstrom, K.E. and Houston, R.S., 1984. The Cheyenne belt: analysis of a Proterozoic suture in southern Wyoming. Precambrian Res., 25: 415--446. The Cheyenne belt of southeastern Wyoming is a major shear zone which separates Archean rocks of the Wyoming province to the north from 1800--1600 Ma old eugeoclinal gneisses to the south. Miogeoclinal rocks (2500--2000 Ma old)unconformably overlie Archean basement immediately north of the shear zone and were deposited under transgressive conditions along a rift-formed continental margin. Intrusive tholeiitic sills and dikes are interpreted as rift-related intrusions and a date of 2000 Ma on a felsic differentiate of these intrusions gives the approximate age of rifting. There are no known post-2000 Ma felsic intrusions north of the Cheyenne belt. Volcanogenic gneisses and abundant syntectonic calc-alkaline plutons of the southern terrane are interpreted as island arc volcanic and plutonic rocks. The volcanics are a bimodal basalt--rhyolite assemblage. Plutons include large gabbroic complexes and quartz diorite (1780 Ma), syntectonic granitoids ( 1730--1630 Ma) and post-tectonic anorthosite and granite (1400 Ma). There is no evidence for Archean crust south of the Cheyenne belt.
Geology, 2002
present bedrock incision rates of the Colorado River at three sites in the Grand Canyon. From wes... more present bedrock incision rates of the Colorado River at three sites in the Grand Canyon. From west to east, these sites and rates (averaged over the past 300 to 500 k.y.) are Granite Park, 72-92 m/m.y.; Toroweap, 133 Ϯ 16 m/m.y.; and Eastern Canyon, 135 Ϯ 17 to 144 Ϯ 18 m/m.y. Granite
Geology, 2000
The Rocky Mountains, Colorado Plateau, and Midcontinent, regions of the North American cratonic p... more The Rocky Mountains, Colorado Plateau, and Midcontinent, regions of the North American cratonic platform, display similar styles and patterns of Phanerozoic deformation. In these regions, movement on basement-penetrating faults during the late Paleozoic Ancestral Rockies event and/or ...
Precambrian Research, 1984
Karlstrom, K.E. and Houston, R.S., 1984. The Cheyenne belt: analysis of a Proterozoic suture in s... more Karlstrom, K.E. and Houston, R.S., 1984. The Cheyenne belt: analysis of a Proterozoic suture in southern Wyoming. Precambrian Res., 25: 415--446. The Cheyenne belt of southeastern Wyoming is a major shear zone which separates Archean rocks of the Wyoming province to the north from 1800--1600 Ma old eugeoclinal gneisses to the south. Miogeoclinal rocks (2500--2000 Ma old)unconformably overlie Archean basement immediately north of the shear zone and were deposited under transgressive conditions along a rift-formed continental margin. Intrusive tholeiitic sills and dikes are interpreted as rift-related intrusions and a date of 2000 Ma on a felsic differentiate of these intrusions gives the approximate age of rifting. There are no known post-2000 Ma felsic intrusions north of the Cheyenne belt. Volcanogenic gneisses and abundant syntectonic calc-alkaline plutons of the southern terrane are interpreted as island arc volcanic and plutonic rocks. The volcanics are a bimodal basalt--rhyolite assemblage. Plutons include large gabbroic complexes and quartz diorite (1780 Ma), syntectonic granitoids ( 1730--1630 Ma) and post-tectonic anorthosite and granite (1400 Ma). There is no evidence for Archean crust south of the Cheyenne belt.
Geology, 2002
present bedrock incision rates of the Colorado River at three sites in the Grand Canyon. From wes... more present bedrock incision rates of the Colorado River at three sites in the Grand Canyon. From west to east, these sites and rates (averaged over the past 300 to 500 k.y.) are Granite Park, 72-92 m/m.y.; Toroweap, 133 Ϯ 16 m/m.y.; and Eastern Canyon, 135 Ϯ 17 to 144 Ϯ 18 m/m.y. Granite