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Kennedy dike swarm

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Journal Article

2.01-Ga Kennedy dike swarm, southeastern Wyoming : Record of a rifted margin along the southern Wyoming province Available to Purchase

David M. Cox, Carol D. Frost, Kevin R. Chamberlain
Published: 01 January 2000
Rocky Mountain Geology (2000) 35 (1): 7–30.
DOI: https://doi.org/10.2113/35.1.7
...David M. Cox; Carol D. Frost; Kevin R. Chamberlain Abstract The Kennedy dike swarm of the central and northern Laramie Mountains is the most extensive Precambrian dike swarm of the Wyoming province. The dikes occupy from 15 to 20% of a 100-km-wide exposure of Archean basement, and include diabasic...
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View PDF for article title, 2.01-Ga <span class="search-highlight">Kennedy</span> <span class="search-highlight">dike</span> <span class="search-highlight">swarm</span>, southeastern Wyoming : Record of a rifted margin along the southern Wyoming province
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Major element compositions of the Kennedy dike swarm plotted as a function of wt. % MgO. Northern peridotite group includes Preacher Creek, Elk Park, Wheeler Flat and John Ballard bodies. Data from Condie (1969)Snyder et al. (1992, 1995, 1997b, 1998, in press), Hall et al. (1987), Summers et al. (1995), and this study.

Major element compositions of the Kennedy dike swarm plotted as a function ... Available to Purchase

Published: 01 January 2000
Figure 8. Major element compositions of the Kennedy dike swarm plotted as a function of wt. % MgO. Northern peridotite group includes Preacher Creek, Elk Park, Wheeler Flat and John Ballard bodies. Data from Condie (1969) Snyder et al. (1992 , 1995 , 1997b , 1998 , in press ), Hall et al
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Minor element compositions of the Kennedy dike swarm plotted as a function of wt. % MgO. Data sources as in Fig. 8.

Minor element compositions of the Kennedy dike swarm plotted as a function ... Available to Purchase

Published: 01 January 2000
Figure 9. Minor element compositions of the Kennedy dike swarm plotted as a function of wt. % MgO. Data sources as in Fig. 8 .
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Initial Nd and Sr isotopic compositions of Kennedy dike swarm samples compared to isotopic compositions of potential source materials at 2.01 Ga. The Nd isotopic compositions of the dikes are consistent with derivation from a depleted mantle source contaminated with 1–2% of felsic Archean crust. Data from Table 3; depleted mantle and Archean compositions given in Table 4.

Initial Nd and Sr isotopic compositions of Kennedy dike swarm samples compa... Available to Purchase

Published: 01 January 2000
Figure 11. Initial Nd and Sr isotopic compositions of Kennedy dike swarm samples compared to isotopic compositions of potential source materials at 2.01 Ga. The Nd isotopic compositions of the dikes are consistent with derivation from a depleted mantle source contaminated with 1–2% of felsic
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Interpretation of the Kennedy dike swarm in southeastern Wyoming as part of an early passive margin-failed arm rift system, after a model for continental mafic dike swarms proposed by Fahrig (1987). According to this model, a complementary set of passive margin dikes and a failed arm dike swarm were formed on the continent that rifted away from the Wyoming province at 2.01 Ga. This continental block and dikes have yet to be identified, although the Lac de Gras dike swarm in the Slave province is nearly the same age as the Kennedy dike swarm.

Interpretation of the Kennedy dike swarm in southeastern Wyoming as part of... Available to Purchase

Published: 01 January 2000
Figure 13. Interpretation of the Kennedy dike swarm in southeastern Wyoming as part of an early passive margin-failed arm rift system, after a model for continental mafic dike swarms proposed by Fahrig (1987) . According to this model, a complementary set of passive margin dikes and a failed
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Plot of Pb isotopic compositions of feldspar and whole rocks from the Kennedy dike swarm. Fields of potential source rocks are also shown, including contemporary mantle, based upon the model evolution of Zartman and Doe (1981), and Archean rocks exposed to the north in the Laramie Mountains (Verts et al., 1996; Bell, 1998; Chamberlain and Bowring, in press). Feldspar Pb isotopic compositions from other regions of the Wyoming province are shown for reference: eastern Beartooth Mountains (EBT) from Wooden and Mueller (1988), Wind River Mountains (WR) from Frost et al. (1998). Typical 238U/204Pb values (μ) for upper crust range from 8 to 12. The Pb isotopic composition of Archean crust in the Laramie Mountains at 2.01 Ga is variable; mixtures of model mantle and a range of compositions of Archean crust are indicated by the shaded triangle. The feldspar analyses from the Kennedy dike swarm lie within or near this triangle, present-day whole rock values lie to the right due to production of radiogenic Pb by U decay between 2.01 Ga and the present. The elevated 207Pb/204Pb ratios of feldspars and whole rocks from the Kennedy dike swarm are interpreted to indicate incorporation of Archean crust into a mantle-derived parental magma.

Plot of Pb isotopic compositions of feldspar and whole rocks from the Kenne... Available to Purchase

Published: 01 January 2000
Figure 12. Plot of Pb isotopic compositions of feldspar and whole rocks from the Kennedy dike swarm. Fields of potential source rocks are also shown, including contemporary mantle, based upon the model evolution of Zartman and Doe (1981) , and Archean rocks exposed to the north in the Laramie
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A, U-Pb concordia diagrams for the Kennedy diabase; B, periodotite; and C, plagioclase porphyry; together with D, a concordia diagram showing data for samples with baddeleyite rimmed with metamorphic zircon. The data are interpreted to indicate that the Kennedy dike swarm was emplaced at 2.01 Ga, and that metamorphic zircon and sphene grew during regional metamorphism and deformation associated with the Medicine Bow orogeny at 1.76 Ga. The U-Pb system in apatite was also reset during regional metamorphism (this study; Chamberlain and Bowring, in press).

A, U-Pb concordia diagrams for the Kennedy diabase; B, periodotite; a... Available to Purchase

Published: 01 January 2000
Figure 7. A, U-Pb concordia diagrams for the Kennedy diabase; B, periodotite; and C, plagioclase porphyry; together with D, a concordia diagram showing data for samples with baddeleyite rimmed with metamorphic zircon. The data are interpreted to indicate that the Kennedy dike
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Plot of chondrite-normalized rare earth element concentrations for samples from the Kennedy dike swarm. Chondrite-normalizing values are taken from Hanson (1980). Data from Potts and Condie (1971), Snyder (1986), Summers et al. (1995), and Snyder et al. (1991, 1995, 1997b, 1998, in press).

Plot of chondrite-normalized rare earth element concentrations for samples ... Available to Purchase

Published: 01 January 2000
Figure 10. Plot of chondrite-normalized rare earth element concentrations for samples from the Kennedy dike swarm. Chondrite-normalizing values are taken from Hanson (1980) . Data from Potts and Condie (1971) , Snyder (1986) , Summers et al. (1995) , and Snyder et al. (1991 , 1995 , 1997b
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Sketch map of Precambrian rocks exposed in southeastern Wyoming, modified from Chamberlain (1998). Basement north of the Cheyenne belt is the Archean Wyoming province, south is the Proterozoic Colorado province. The Kennedy dike swarm intrudes Archean basement in the Laramie Mountains north of the suture between the Archean and Proterozoic provinces. This suture is exposed in the Medicine Bow Mountains and Sierra Madre as a series of shear zones, but in the Laramie Mountains its trace has been obliterated by emplacement of 1.43-Ga intrusions. WY = Wyoming province, SP = Superior province.

Sketch map of Precambrian rocks exposed in southeastern Wyoming, modified f... Available to Purchase

Published: 01 January 2000
Figure 1. Sketch map of Precambrian rocks exposed in southeastern Wyoming, modified from Chamberlain (1998) . Basement north of the Cheyenne belt is the Archean Wyoming province, south is the Proterozoic Colorado province. The Kennedy dike swarm intrudes Archean basement in the Laramie
Journal Article

Spatio-temporal position of the Ediacaran Thalbah Basin in the Najd Fault System, Arabian Shield Open Access

Richard Al-Husseini
Journal: GeoArabia
Publisher: Gulf Petrolink
Published: 01 January 2015
GeoArabia (2015) 20 (1): 17–44.
DOI: https://doi.org/10.2113/geoarabia200117
..., then these two formations would be older than 575 ± 5 Ma. Dating the dike swarm that cuts the Thalbah Group should be considered for future research. The Ajjaj Shear Zone sensu the Saudi Geological Survey ( Kennedy et al., 2011a , b; Johnson and Kattan, 2012 ) trends EW and crosses the Al Wajh...
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Journal Article

Wyoming on the run—Toward final Paleoproterozoic assembly of Laurentia Available to Purchase

Taylor M. Kilian, Kevin R. Chamberlain, David A.D. Evans, Wouter Bleeker, Brian L. Cousens
Journal: Geology
Published: 01 October 2016
Geology (2016) 44 (10): 863–866.
DOI: https://doi.org/10.1130/G38042.1
.... , 2000 , 2.01-Ga Kennedy dike swarm, southeastern Wyoming: Record of a rifted margin along the southern Wyoming province : Rocky Mountain Geology , v. 35 , p. 7 – 30 , doi:10.2113/35.1.7. Dahl , P.S. , Holm , D.K. , Gardner , E.T. , Hubacher , F.A. , and Foland , K.A...
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Seismic investigation of magmatic unrest beneath Mammoth Mountain, California, USA Available to Purchase

Guoqing Lin
Journal: Geology
Published: 01 August 2013
Geology (2013) 41 (8): 847–850.
DOI: https://doi.org/10.1130/G34062.1
... through 30 September activity : Seismological Society of America Bulletin , v. 80 , p. 325 – 339 . Hughes G.R. , 2011 , Reinvestigation of the 1989 Mammoth Mountain, California seismic swarm and dike intrusion : Journal of Volcanology and Geothermal Research , v. 207 , p. 106 – 112 , doi...
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Reflections on Proterozoic magmatism of the Rocky Mountains and environs : Past and present Available to Purchase

Carol D. Frost
Published: 01 January 2000
Rocky Mountain Geology (2000) 35 (1): 1–5.
DOI: https://doi.org/10.2113/gsrocky.35.1.1
... , Government Printing Office, Department of the Interior, U. S. Geographical and Geological Survey of the Rocky Mountain Region, J. W. Powell , in-charge, 566 p. Cox , D. M. , Frost , C. D. , and Chamberlain , K. R. , 2000 , 2.01-Ga Kennedy dike swarm, southeastern Wyoming: Record...
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A user-driven feedback approach for 2D direct current resistivity inversion based on particle swarm optimization Available to Purchase

Francisco M. Barboza, Walter E. Medeiros, Jerbeson M. Santana
Journal: Geophysics
Published: 27 February 2019
Geophysics (2019) 84 (2): E105–E124.
DOI: https://doi.org/10.1190/geo2017-0735.1
...) ( Goldberg, 1989 ), and particle swarm optimization (PSO) ( Kennedy et al., 2001 ). SA (e.g., Sen and Stoffa, 1995 ; Rucker and Ferré, 2005 ; Santos et al., 2006 ; Pei et al., 2007 ; Wang et al., 2012 ; Biswas and Sharma, 2014 ), GA (e.g., Sen and Stoffa, 1995 ; Başokur et al., 2007 ; Jha et al...
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View PDF for article title, A user-driven feedback approach for 2D direct current resistivity inversion based on particle <span class="search-highlight">swarm</span> optimization
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Journal Article

Structural Significance of L Tectonites in the Eastern-Central Laramie Mountains, Wyoming Available to Purchase

Walter A. Sullivan
Published: 01 September 2006
The Journal of Geology (2006) 114 (5): 513–531.
DOI: https://doi.org/10.1086/506158
... tectonites. Lineation is parallel to the fold hinge, and the trend and plunge of the fold hinge is 182°/34°. Note field book for scale. Locations and directions of view are given in figure 2 . Diabase dikes of the 2.01-Ga (U-Pb, zircon) Kennedy dike swarm (Cox et al. 2000 ) are found throughout...
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Emplacement dynamics of syn-collapse ring dikes: An example from the Altenberg-Teplice caldera, Bohemian Massif Available to Purchase

Filip Tomek, Jiří Žák, Martin Svojtka, Fritz Finger, Michael Waitzinger
Journal: GSA Bulletin
Published: 21 November 2018
GSA Bulletin (2019) 131 (5-6): 997–1016.
DOI: https://doi.org/10.1130/B35019.1
... ( Mlčoch and Skácelová, 2010 ). The caldera formation commenced with the emplacement of ∼NE-SW and ∼N-S to ∼NNW-SSE–striking rhyolite dikes ( Fig. 2B ; Schust, 1980 ; Wetzel, 1984 ). The Sayda-Berggießhübel dike swarm (NW part of the caldera) and associated pyroclastic deposits are interpreted...
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View PDF for article title, Emplacement dynamics of syn-collapse ring <span class="search-highlight">dikes</span>: An example from the Altenberg-Teplice caldera, Bohemian Massif
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Tree-ring 14 C links seismic swarm to CO 2 spike at Yellowstone, USA Available to Purchase

William C. Evans, Deborah Bergfeld, John P. McGeehin, John C. King, Henry Heasler
Journal: Geology
Published: 01 December 2010
Geology (2010) 38 (12): 1075–1078.
DOI: https://doi.org/10.1130/G31345.1
... States) closely followed a 1989 seismic swarm attributed to dike intrusion ( Cook et al., 2001 ). Perhaps due to uncertainty over site selection, tree-ring 14 C studies had not been attempted at Yellowstone caldera (Wyoming, United States), even though delineating the sources of unrest at this giant...
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View PDF for article title, Tree-ring 14 C links seismic <span class="search-highlight">swarm</span> to CO 2 spike at Yellowstone, USA
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Gunbarrel mafic magmatic event: A key 780 Ma time marker for Rodinia plate reconstructions Available to Purchase

Stephen S. Harlan, Larry Heaman, Anthony N. LeCheminant, Wayne R. Premo
Journal: Geology
Published: 01 December 2003
Geology (2003) 31 (12): 1053–1056.
DOI: https://doi.org/10.1130/G19944.1
... event is herein termed the Gunbarrel magmatic event. The mafic magmatism of the Gunbarrel event represents the largest mafic dike swarm yet identified along the Neoproterozoic margin of Laurentia. The origin of the mafic magmatism is not clear, but may be related to mantle-plume activity or upwelling...
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Stratigraphic and U-Pb SHRIMP Detrital Zircon Evidence for a Neoproterozoic Continental Arc, Central China: Rodinia Implications Available to Purchase

Peter Druschke, Andrew D. Hanson, Quanren Yan, Zhongqi Wang, Tao Wang
Published: 01 September 2006
The Journal of Geology (2006) 114 (5): 627–636.
DOI: https://doi.org/10.1086/506162
...) to 700 Ma (conventional U-Pb; Zhao et al. 1990 ). A series of small-scale mafic dike swarms intruding the Bikou terrane have been dated as ca. 689 and 660–652 Ma using the SHRIMP U-Pb and 40 Ar/ 39 Ar methods, respectively (Yan et al. 2004 a ). Mafic dikes intruding the Bikou terrane display...
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View PDF for article title, Stratigraphic and U-Pb SHRIMP Detrital Zircon Evidence for a Neoproterozoic Continental Arc, Central China: Rodinia Implications
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Precambrian history of the eastern Ferris Mountains and Bear Mountain, south-central Wyoming Province Available to Purchase

Nancy E. Bowers, Kevin R. Chamberlain
Published: 11 December 2006
Canadian Journal of Earth Sciences (2006) 43 (10): 1467–1487.
DOI: https://doi.org/10.1139/e06-091
...-derived) ages for mobilization and mineralization of galena within the Spanish Mine metamorphic suite are in agreement with dates of dike intrusion and hydrothermal circulation within the southern Wyoming Province. Cox et al. ( 2000 ) report an age of 2010 Ma for the Kennedy dike swarm in the central...
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View PDF for article title, Precambrian history of the eastern Ferris Mountains and Bear Mountain, south-central Wyoming Province
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