Evolution of Devonian carbonate-shelf margin, Nevada

Morrow, Jared R.; Sandberg, Charles A.

doi:10.1130/ges00134.1

Cited by 33 publications

(34 citation statements)

References 36 publications

(81 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This segment is also characterized by minor episodes of alkalic magmatism (Turner et al, 1989), underlying zones of both extended and intact Laurentian basement, and the presence of probable rotated crustal fault blocks at depth (Tosdal et al, 2000;Crafford and Grauch, 2002) that were reactivated during the Devonian (Emsbo et al, 1999;Morrow and Sandberg, 2008). These features indicate that the Nevada-Utah segment of the miogeocline was created along a lowerplate, north-striking, rift segment.…”

Section: Extensional Setting Of Margin Segmentsmentioning

confidence: 90%

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

2008

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: 90%

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

2008

View full text Add to dashboard Cite

show abstract

“…1). This stratigraphic interval predates the major effects of the Antler orogeny and subsequent foreland-basin development in the Great Basin (Goebel 1991;Morrow and Sandberg 2008).…”

Section: Stratigraphic Overview and Methodsmentioning

confidence: 99%

“…The road-cut and natural exposures are limited in vertical extent (typically 5 to 15 m thick) but permit bedding to be traced laterally for tens of meters. The measured cores (, 20 to 72 m thick) can be Day et al (2006) and Morrow and Sandberg (2008). Ages (mya) from Kaufmann (2006).…”

Section: Stratigraphic Overview and Methodsmentioning

confidence: 99%

Stratigraphic Completeness of Carbonate-Dominated Records From Continental Interiors Versus Continental Margins: Stratigraphic Thinning Occurs Via Condensation and Omission At Multiple Scales

Brady

2015

Journal of Sedimentary Research

View full text Add to dashboard Cite

Over Phanerozoic time scales, stratigraphic records from continental interiors, or cratons, are dramatically thinner and are generally assumed to be relatively incomplete, with more numerous and longer-duration hiatuses, compared to records from more rapidly subsiding continental margins. However, this assumption need not be true for the shorter time scales (i.e., several 10 6 years and shorter) over which accumulation of the preserved stratigraphic record on the continental interior actually takes place. This study compares carbonate-dominated sedimentary records from the Devonian continental interior (Iowa) and continental margin (Nevada) to evaluate whether the continental-interior record is (1) miniaturized, i.e., thinner, but equally complete; (2) comparable in thickness and quality where the sedimentary record is preserved, but certain portions of the record are notably absent, i.e., omitted or truncated; or (3) so invariably preserved that equivalent stratigraphic packages cannot be recognized compared to the continental-margin record.This study finds that fourth-to fifth-order cycles in Iowa are, on average, approximately half as thick and half as numerous compared to the continental margin of Nevada. Moreover, the stratigraphic record on the continental margin of Nevada is dominated by cycles that are composed of tidal-flat and shallow subtidal lithofacies, capped by simple flooding surfaces, and exhibit catch-up or keep-up depositional styles. The continental-interior record in Iowa is dominated by cycles that are composed of subtidal lithofacies, capped by a range of bounding surfaces, and exhibit catch-down or give-up depositional styles. These findings suggest that the thin record in Iowa is largely a result of low sedimentation rates associated with suppressed carbonate production in this epeiric-sea setting, rather than minimal subsidence rates and an increased potential for subaerial exposure and associated loss of record.

show abstract

“…4); (2) polytaxic skeletal concentrations tend to have a higher proportion of dispersed-loosely packed and patchy and internally complex beds; and (3) monotaxic (restricted lithofacies) have a higher proportion of loosely/densely packed beds compared to other types. Despite these differences, most skeletal concentrations are relatively thin Day (2006) and Morrow and Sandberg (2008). Ages (mya) from Kaufmann (2006).…”

Section: Taxonomic Composition Of Devonian Skeletal Concentrationsmentioning

confidence: 97%

“…Ages (mya) from Kaufmann (2006). Chronostratigraphic placement of lithostratigraphic units after Witzke and Bunker (1989), Day (2006), Morrow and Sandberg (2008) (i.e., occur within the scale of a single bed or lithofacies) and exhibit little internal stratigraphic complexity. Below, these taxonomic types are compared by region (Iowa versus Nevada) and then by depositional environment to highlight the systematic effects of subsidence setting and depositional environment on the characteristics of skeletal concentrations.…”

Section: Taxonomic Composition Of Devonian Skeletal Concentrationsmentioning

confidence: 99%

Middle to Upper Devonian Skeletal Concentrations From Carbonate-Dominated Settings of North America: Investigating the Effects of Bioclast Input and Burial Rates Across Multiple Temporal and Spatial Scales

Brady¹

2016

PALAIOS

View full text Add to dashboard Cite

Skeletal concentrations, defined here as deposits ! 10% by volume invertebrate bioclasts (. 2 mm), are very common targets of paleobiological investigations. The complex interactions among biological, taphonomic, and physical environmental processes influence the type and quality of information that can be drawn from these paleobiological repositories. This study examines the relative roles of bioclast input and burial on the formation of Middle-Upper Devonian skeletal concentrations from tropical carbonate-dominated settings. Based on original field observations of skeletal concentrations and host lithologies, skeletal concentrations are compared (1) between a thermally subsiding passive margin (Nevada) and a relatively stable cratonic interior (Iowa) and (2) across a range of comparable subtidal depositional environments. The majority of skeletal concentrations are thin ( 30 cm), monotypic, have simple internal stratigraphy, and exhibit moderate to high degrees of skeletal fragmentation and disarticulation. Compared to the subsiding margin of Nevada, the cratonic interior of Iowa preserves a higher proportion of polytaxic skeletal concentrations with complex internal stratigraphy and higher taphonomic damage, consistent with control by delayed or slow burial. From shallow to deep subtidal environments, stratigraphic thickness and internal complexity decrease and fragmentation increases, consistent with strong control of these attributes by the frequency of physical and biogenic reworking. While low bioclast production rates may exert a dominant control on the failure to accumulate thick, dense skeletal concentrations in these deposits, taphonomic and physical environmental processes, such as low net sediment accumulation, sediment winnowing and starvation, and bioturbation can explain much of the variation in Middle-Upper Devonian skeletal concentrations.

show abstract

Evolution of Devonian carbonate-shelf margin, Nevada

Cited by 33 publications

References 36 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

Stratigraphic Completeness of Carbonate-Dominated Records From Continental Interiors Versus Continental Margins: Stratigraphic Thinning Occurs Via Condensation and Omission At Multiple Scales

Middle to Upper Devonian Skeletal Concentrations From Carbonate-Dominated Settings of North America: Investigating the Effects of Bioclast Input and Burial Rates Across Multiple Temporal and Spatial Scales

Contact Info

Product

Resources

About