Precambrian crystalline basement map of Idaho: An interpretation of aeromagnetic anomalies

Sims, P.K.; Lund, Karen; Anderson, Eric D.

doi:10.3133/sim2884

Cited by 15 publications

(32 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These are related manifestations of recurrently active, Cryogenian-Late Cambrian, continental arch and extensional magmatic systems, respectively. Across central Idaho southwest of the miogeoclinal and alkalic igneous belts, aeromagnetic and isotopic data indicate that Laurentian basement is present and extended, but not offset (Armstrong et al, 1977;Sims et al, 2005). These features suggest that the Idaho segment of the western Laurentian margin was related to a northwest-striking rift segment with northeast-southwest extension.…”

Section: Extensional Setting Of Margin Segmentsmentioning

confidence: 83%

“…The core of Laurentia is composed of Archean and Paleoproterozoic domains that were assembled in the Paleoproterozoic (Hoffman, 1988;Ross et al, 1991;Karlstrom et al, 2002;Sims et al, 2005;Foster et al, 2006). Across that Paleoproterozoic continental mass, isolated Mesoproterozoic basins were created in localized rifting events (Link et al, 1993;Price and Sears, 2000;Ross et al, 2001).…”

Section: Influence Of Preexisting Structures On Inheritancementioning

confidence: 96%

“…Current maps of Precambrian basement domains in western Laurentia show dominantly north-and northeast-striking domain boundaries (Ross et al, 2001;Karlstrom et al, 2002;Sims et al, 2005;Foster et al, 2006) that are oblique or orthogonal to the trace of the Neoproterozoic-Paleozoic miogeocline. These orthogonal trends between basement domains and the future Cordilleran margin are also depicted in models matching basement domains between western Laurentia and other continental masses (Karlstrom et al, 1999;Sears and Price, 2003).…”

Section: Influence Of Preexisting Structures On Inheritancementioning

confidence: 97%

“…However, the combination of isotopic and geophysical data (Premo et al, 2005;Rodriguez and Williams, 2008) with the facies data (above) suggests that the Cheyenne Belt extends into northeastern Nevada and is cut off by the Snake River transfer zone. A more geometrically appealing explanation for basement structure infl uencing position of the Snake River transfer is that the northwestern margin of the Wyoming Province, along the southern boundary (Madison mylonite) of the Great Falls tectonic zone (Karlstrom et al, 2002;Sims et al, 2005), underlies the Snake River Plain. The position of the Snake River transfer (previous section), as predicted by facies and structural data, indicates that structures along the disrupted northwestern edge of the Wyoming Province probably controlled the location of the Snake River transfer.…”

Section: Influence Of Preexisting Structures On Inheritancementioning

confidence: 98%

“…However, subsequent to assembly of Laurentia, Mesoproterozoic basins, such as the Belt Basin, were localized along northwest-striking, early Mesoproterozoic extensional faults (Price and Sears, 2000;Timmons et al, 2001;Sims et al, 2005). Some of these early Mesoproterozoic structures are generally parallel to the succeeding Neoproterozoic-Paleozoic rift segments (i.e., Mesoproterozoic structures related to the southern margin of the Belt Basin are parallel to the Neoproterozoic-Paleozoic eastern Washington-eastern Idaho rift segment) and may have infl uenced location, orientation, and evolution of the younger rift segments.…”

Section: Influence Of Preexisting Structures On Inheritancementioning

confidence: 98%

See 4 more Smart Citations

Geometry of the Neoproterozoic and Paleozoic rift margin of western Laurentia: Implications for mineral deposit settings

2008

Self Cite

View full text Add to dashboard Cite

The U.S. and Canadian Cordilleran miogeocline evolved during several phases of Cryogenian-Devonian intracontinental rifting that formed the western margin of Laurentia. Recent fi eld and dating studies across central Idaho and northern Nevada result in identifi cation of two segments of the rift margin. Resulting interpretations of rift geometry in the northern U.S. Cordillera are compatible with interpretations of northweststriking asymmetric extensional segments subdivided by northeast-striking transform and transfer segments. The new interpretation permits integration of miogeoclinal segments along the length of the western North American Cordillera. For the U.S. Cordillera, miogeoclinal segments include the St. Mary-Moyie transform, eastern Washingtoneastern Idaho upper-plate margin, Snake River transfer, Nevada-Utah lower-plate margin, and Mina transfer. The rift is orthogonal to most older basement domains, but the location of the transform-transfer zones suggests control of them by basement domain boundaries. The zigzag geometry of reentrants and promontories along the rift is paralleled by salients and recesses in younger thrust belts and by segmentation of younger extensional domains. Likewise, transform-transfer zones localized subsequent transcurrent structures and igneous activity. Sediment-hosted mineral deposits trace the same zigzag geometry along the margin. Sedimentary exhalative (sedex) Zn-Pb-Ag ± Au and barite mineral deposits formed in continental-slope rocks during the Late Devonian-Mississippian and to a lesser degree, during the Cambrian-Early Ordovician. Such deposits formed during episodes of renewed extension along miogeoclinal segments. Carbonate-hosted Mississippi Valleytype (MVT) Zn-Pb deposits formed in structurally reactivated continental shelf rocks during the Late Devonian-Mississippian and Mesozoic due to reactivation of preexisting structures. The distribution and abundance of sedex and MVT deposits are controlled by the polarity and kinematics of the rift segment. Locally, discrete mineral belts parallel secondary structures such as rotated crustal blocks at depth that produced sedimentary subbasins and conduits for hydrothermal fl uids. Where the miogeocline was overprinted by Mesozoic and Cenozoic deformation and magmatism, igneous rock-related mineral deposits are common.

show abstract

Section: Extensional Setting Of Margin Segmentsmentioning

confidence: 83%

Section: Influence Of Preexisting Structures On Inheritancementioning

confidence: 96%

Section: Influence Of Preexisting Structures On Inheritancementioning

confidence: 97%

Section: Influence Of Preexisting Structures On Inheritancementioning

confidence: 98%

Section: Influence Of Preexisting Structures On Inheritancementioning

confidence: 98%

See 3 more Smart Citations

Geometry of the Neoproterozoic and Paleozoic rift margin of western Laurentia: Implications for mineral deposit settings

2008

Self Cite

View full text Add to dashboard Cite

show abstract

Crustal structure beneath the Blue Mountains terranes and cratonic North America, eastern Oregon, and Idaho, from teleseismic receiver functions

et al. 2016

View full text Add to dashboard Cite

We present new images of lithospheric structure obtained from P‐to‐S conversions defined by receiver functions at the 85 broadband seismic stations of the EarthScope IDaho‐ORegon experiment. We resolve the crustal thickness beneath the Blue Mountains province and the former western margin of cratonic North America, the geometry of the western Idaho shear zone (WISZ), and the boundary between the Grouse Creek and Farmington provinces. We calculated P‐to‐S receiver functions using the iterative time domain deconvolution method, and we used the H‐k grid search method and common conversion point stacking to image the lithospheric structure. Moho depths beneath the Blue Mountains terranes range from 24 to 34 km, whereas the crust is 32–40 km thick beneath the Idaho batholith and the regions of extended crust of east‐central Idaho. The Blue Mountains group Olds Ferry terrane is characterized by the thinnest crust in the study area, ~24 km thick. There is a clear break in the continuity of the Moho across the WISZ, with depths increasing from 28 km west of the shear zone to 36 km just east of its surface expression. The presence of a strong midcrustal converting interface at ~18 km depth beneath the Idaho batholith extending ~20 km east of the WISZ indicates tectonic wedging in this region. A north striking ~7 km offset in Moho depth, thinning to the east, is present beneath the Lost River Range and Pahsimeroi Valley; we identify this sharp offset as the boundary that juxtaposes the Archean Grouse Creek block with the Paleoproterozoic Farmington zone.

show abstract

Migrating magmatism in the northern US Cordillera: in situ U–Pb geochronology of the Idaho batholith

Gaschnig

Vervoort

Lewis

et al. 2009

Contrib Mineral Petrol

149

207

View full text Add to dashboard Cite

Precambrian crystalline basement map of Idaho: An interpretation of aeromagnetic anomalies

Cited by 15 publications

References 62 publications

Geometry of the Neoproterozoic and Paleozoic rift margin of western Laurentia: Implications for mineral deposit settings

Geometry of the Neoproterozoic and Paleozoic rift margin of western Laurentia: Implications for mineral deposit settings

Crustal structure beneath the Blue Mountains terranes and cratonic North America, eastern Oregon, and Idaho, from teleseismic receiver functions

Migrating magmatism in the northern US Cordillera: in situ U–Pb geochronology of the Idaho batholith

Contact Info

Product

Resources

About