<sup>40</sup>Ar/<sup>39</sup>Ar Evidence For 1.4 Ga Regional Metamorphism in New Mexico: Implications For Thermal Evolution of Lithosphere in the Southwestern Usa

Karlstrom, Karl E.; Dallmeyer, R. D.; Grambling, Jeffrey A.

doi:10.1086/515912

Cited by 53 publications

(41 citation statements)

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“…following the ca. 1.4 Ga thermal event (Karlstrom et al, 1997), in agreement with other studies in the region (e.g., Sanders et al, 2006). Following the Paleoproterozoic to Mesoproterozoic shortening events and peak metamorphism, nearby areas south of the Picuris Mountains cooled to 200-350 °C by ca.…”

Section: Picuris Range Geologysupporting

confidence: 91%

Deciphering the early history of a multiply reactivated fault using strain analysis in an adjacent fold: Evidence for early brittle-plastic slip on the Picuris-Pecos fault, New Mexico, USA

2012

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Section: Picuris Range Geologysupporting

confidence: 91%

Deciphering the early history of a multiply reactivated fault using strain analysis in an adjacent fold: Evidence for early brittle-plastic slip on the Picuris-Pecos fault, New Mexico, USA

2012

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“…Such folding, isotopic resetting, and low-grade metamorphism in the Lake Superior region are thought to be the result of foreland deformation related to the Mazatzal Orogeny (Dott 1983;Van Schmus et al 1993;Holm et al 1998;Romano et al 2000), well documented in Arizona and New Mexico (Karlstrom et al 1997). Folding of the Baraboo Quartzite is also attributed to this 1630 Ma event, and Rb/Sr isotopic resetting at 1635 Ma of granite and rhyolite beneath the quartzite is consistent with such an interpretation.…”

Section: Implications For Late Paleoproterozoic Weathering Sedimentamentioning

confidence: 66%

“…The epizonal to mesozonal granite plutons were typically accompanied by contact metamorphism, although regional metamorphism and deformation occurred in Arizona, New Mexico, and Colorado (Karlstrom et al 1997), and far-reaching hydrothermal alteration is now recognized in the Baraboo and Sioux quartzites of the southern Lake Superior region. It is intriguing that the Athabasca basin, which occurs ∼2,000 km northwest of the transcontinental belt, was affected by several Proterozoic high-temperature (200ЊC) hydrothermal events, including one at Ma, as indicated 1477 ‫ע‬ 57 by a Rb-Sr isochron for diagenetic illite that formed from high-temperature basin fluids (Kotzer et al 1992).…”

Section: Implications For Proto-north Americamentioning

confidence: 99%

Late Paleoproterozoic Climate, Tectonics, and Metamorphism in the Southern Lake Superior Region and Proto–North America: Evidence from Baraboo Interval Quartzites

Medaris¹,

Singer²,

Dott³

et al. 2003

The Journal of Geology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to The Journal of Geology. A B S T R A C TRed, supermature quartzites of the Baraboo interval of the Lake Superior region contain detrital zircon that ranges in age from 1782 to 1712 Ma. Deposition clearly occurred after the geon 18 Penokean orogeny. These late Paleoproterozoic sedimentary rocks consist largely of quartz, kaolinite or pyrophyllite, and hematite; detrital feldspar and muscovite are rare or absent. Their Chemical Index of Alteration ranges from 96.8 to 98.6, among the most chemically mature clastic sediments in the geological record. The quartzites are underlain by mature, feldspar-free paleosols, accounting for the absence of feldspar in the overlying sediments and indicating the presence of first-cycle quartzose detritus. Such physical and chemical characteristics imply that late Paleoproterozoic deposition in the Lake Superior region occurred in a stable tectonic setting with subdued topographic relief in a warm, humid climate. Folding and low-grade metamorphism of the quartzites is thought to reflect ∼1630 Ma foreland deformation related to the Mazatzal orogeny. Younger hydrothermal alteration is widespread in the Baraboo and Sioux quartzites and, based on 40 Ar/ 39 Ar dating of low-temperature minerals, is attributed to the migration of fluids along permeable channels in response to the thermal effects of magmatism associated with the 1465 Ma Wolf River batholith. Much of the Paleo-and Mesoproterozoic crust of Proto-North America may have been affected by areally extensive, but stratigraphically restricted, hydrothermal alteration related to the influence of geon 14 transcontinental A-type granitic magmatism.

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“…Population B3 (1500-1334 Ma) is the same age as the 1500-1350 Ma granitic intrusions in the southwestern United States (Anderson, 1983;Hoffman, 1988Hoffman, , 1989Karlstrom et al, 1997Karlstrom et al, , 2004 and Sonora (Anderson and Silver , 1981;Nourse et al, 2005, and references therein). B3 grains are found as well in the midcontinent Granite-Rhyolite Province underlying the Great Plains (Bickford et al, 1986), although the lack of major basement uplifts in this region makes this an unlikely source.…”

Section: Major Sourcesmentioning

confidence: 91%

Provenance of the Paleocene-Eocene Wilcox Group, western Gulf of Mexico basin: Evidence for integrated drainage of the southern Laramide Rocky Mountains and Cordilleran arc

Mackey¹,

Horton²,

Milliken³

2012

Geological Society of America Bulletin

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Laramide basement blocks of the U.S. Rocky Mountain Province have long been considered the sediment source of the Paleocene-Eocene Wilcox Group, implying that large-scale progradation driven by Laramide uplift induced a transition from carbonate to clastic deposition in the Gulf of Mexico. Detrital zircon U-Pb age spectra from 10 samples collected from the Wilcox Group in south Texas reveal a complex grain assemblage with major age populations at ca. 1800-1300 Ma and 350-50 Ma and minor populations at 1300-950 Ma, 3250-1850 Ma, and 900-400 Ma. Modal data for Wilcox Group sand grain populations from the same region suggest a diverse provenance, including sources from the Cordilleran magmatic arc and subordinate reworked sedimentary rocks. Sediment was primarily derived from a mix of crystalline basement blocks in the U.S. southern Rocky Mountains and northern Mexico, the Cordilleran arc of western Mexico and the southwestern United States, and Mesozoic-Paleogene magmatic rocks of northern Mexico. Secondary sources include recycled strata from Sevier-Laramide basins in the southwestern United States and northern Mexico. Comparisons of detrital zircon U-Pb age spectra show that the Lower Wilcox subunit contains signifi cant magmatic arc-derived sediment, whereas the Upper Wilcox subunit is more enriched in basement and recycled sedimentary detritus. Therefore, the relatively quartzose composition of the bulk detrital assemblages throughout the Wilcox Group of south Texas is not an accurate refl ection of the range of volcanic and basement sources indicated by the associated U-Pb ages, suggesting signifi cant attrition of unstable grains during long-distance (>500-1000 km) transport.

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⁴⁰Ar/³⁹Ar Evidence For 1.4 Ga Regional Metamorphism in New Mexico: Implications For Thermal Evolution of Lithosphere in the Southwestern Usa

Cited by 53 publications

References 0 publications

Deciphering the early history of a multiply reactivated fault using strain analysis in an adjacent fold: Evidence for early brittle-plastic slip on the Picuris-Pecos fault, New Mexico, USA

Deciphering the early history of a multiply reactivated fault using strain analysis in an adjacent fold: Evidence for early brittle-plastic slip on the Picuris-Pecos fault, New Mexico, USA

Late Paleoproterozoic Climate, Tectonics, and Metamorphism in the Southern Lake Superior Region and Proto–North America: Evidence from Baraboo Interval Quartzites

Provenance of the Paleocene-Eocene Wilcox Group, western Gulf of Mexico basin: Evidence for integrated drainage of the southern Laramide Rocky Mountains and Cordilleran arc

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40Ar/39Ar Evidence For 1.4 Ga Regional Metamorphism in New Mexico: Implications For Thermal Evolution of Lithosphere in the Southwestern Usa

Cited by 53 publications

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Deciphering the early history of a multiply reactivated fault using strain analysis in an adjacent fold: Evidence for early brittle-plastic slip on the Picuris-Pecos fault, New Mexico, USA

Deciphering the early history of a multiply reactivated fault using strain analysis in an adjacent fold: Evidence for early brittle-plastic slip on the Picuris-Pecos fault, New Mexico, USA

Late Paleoproterozoic Climate, Tectonics, and Metamorphism in the Southern Lake Superior Region and Proto–North America: Evidence from Baraboo Interval Quartzites

Provenance of the Paleocene-Eocene Wilcox Group, western Gulf of Mexico basin: Evidence for integrated drainage of the southern Laramide Rocky Mountains and Cordilleran arc

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⁴⁰Ar/³⁹Ar Evidence For 1.4 Ga Regional Metamorphism in New Mexico: Implications For Thermal Evolution of Lithosphere in the Southwestern Usa