Nomenclature and Correlation of Some Upper Precambrian and Basal Cambrian Sequences in Western Utah and Southeastern Idaho

Crittenden, Max D.; Schaeffer, Frederick E; Trimble, Donald E.; Woodward, Lee A.

doi:10.1130/0016-7606(1971)82[581:nacosu]2.0.co;2

Cited by 66 publications

(19 citation statements)

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“…The Toby Conglomerate is generally thought to be glacial in origin, and its sedimentary and tectonic setting is similar to that of the Pocatello Formation (Aalto, 1971). In concert with lithostratigraphic similarities, the extreme 13 C enrichments suggest that the British Columbia, McCoy Creek, and Caddy Canyon carbonates are correlative as first noted by Crittenden et al (1971;see also Peters, Wickham & Miller, 1992). As remarked upon by these authors, such anomalously positive 8 13 C values are so striking that they form a distinctive regional stratigraphic marker.…”

Section: A the Carbon Isotope Recordmentioning

confidence: 71%

“…Age and correlation Fossils are extremely rare in the Neoproterozoic rocks of northern Utah and southeastern Idaho. 2; Crittenden et al 1971;Oriel & Armstrong, 1971;Link et al 1987), indicating that at least the top of the unit is of Cambrian age. Coarse-grained quartz sandstones such as those found in the Brigham Group have long been recognized as typical of facies containing the biologically and temporally distinctive Ediacaran fauna (Glaessner, 1984).…”

Section: D Metamorphic Historymentioning

confidence: 99%

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Chemostratigraphy of predominantly siliciclastic Neoproterozoic successions: a case study of the Pocatello Formation and Lower Brigham Group, Idaho, USA

Smith

Kaufman²,

Knoll³

et al. 1994

Geol. Mag.

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Isotopic chemostratigraphy has proven successful in the correlation of carbonate-rich Neoproterozoic successions. In successions dominated by siliciclastic rocks, chemostratigraphy can be problematic, but if thin carbonates punctuate siliciclastic strata, useful isotopic data may be obtained. The upper Pocatello Formation and lower Brigham Group of southeastern Idaho provide an opportunity to assess the potential and limitations of isotopic chemostratigraphy in overwhelmingly siliciclastic successions. The 5000 m thick succession consists predominantly of siliciclastic lithologies, with only three intervals that contain thin intercalated carbonates. Its depositional age is only broadly constrained by existing biostratigraphic, sequence stratigraphic and geochronometric data. The lowermost carbonates include a cap dolomite atop diamictites and volcanic rocks of the Pocatello Formation. The S 13 C values of these carbonates are distinctly negative ( -5 to -3), similar to carbonates that overlie Neoproterozoic glaciogenic rocks worldwide. Stratigraphically higher carbonates record a major positive S 13 C excursion to values as high as +8.8 within the carbonate member of the Caddy Canyon Quartzite. The magnitude of this excursion is consistent with post-Sturtian secular variation recorded elsewhere in the North American Cordillera, Australia, Svalbard, Brazil and Namibia, and exceeds the magnitude of any post-Varanger cPC excursion documented to date. In most samples, Sr-isotopic abundances have been altered by diagenesis and greenschist facies metamorphism, but a least-altered value of approximately 0.7076 supports a post-Sturtian and pre-Marinoan/Varanger age for upper Pocatello and lower Brigham rocks that lie above the Pocatello diamictite. Thus, even though available chemostratigraphic data are limited, they corroborate correlations of Pocatello Formation diamictites and overlying units with Sturtian glaciogenic rocks and immediately post-Sturtian successions in western North America and elsewhere.

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Section: A the Carbon Isotope Recordmentioning

confidence: 71%

Section: D Metamorphic Historymentioning

confidence: 99%

Chemostratigraphy of predominantly siliciclastic Neoproterozoic successions: a case study of the Pocatello Formation and Lower Brigham Group, Idaho, USA

Smith

Kaufman²,

Knoll³

et al. 1994

Geol. Mag.

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“…Middle Neoproterozoic (~720-660 Ma) diamictite and volcanicbearing strata (Perry Canyon Formation and correlatives) accumulated during an early phase of rifting (Balgord et al, 2013), and included micaceous strata that subsequently formed the basal decollement for western thrusts of the Sevier belt. Later Neoproterozoic (~660-580 Ma) quartziterich strata (lower Brigham Group and correlatives) accumulated during regional subsidence following early rifting (Crittenden et al, 1971), and formed a relatively strong beam during subsequent deformation. Latest Neoproterozoic to Early Cambrian (~580-530 Ma) arkosic and basalt-bearing strata (upper Brigham Group and correlatives) record final rifting on previously thinned lithosphere (Yonkee et al, 2014).…”

Section: North American Sedimentary Covermentioning

confidence: 99%

Tectonic evolution of the Sevier and Laramide belts within the North American Cordillera orogenic system

Yonkee

Weil

2015

Earth-Science Reviews

304

333

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The thin-skin Sevier and thick-skin Laramide belts of the North American Cordillera provide a long-term record of the interrelations between evolving styles of mountain building and plate dynamics over a complete tectonic cycle, from onset of rapid subduction, to protracted growth of a composite orogenic system, to final collapse. Primary architecture of basement and sedimentary cover rocks, which included a thick passive margin section deposited along the western continental margin, influenced patterns of subsequent deformation. The Cordilleran orogenic system, comprised of an interrelated forearc accretionary complex, magmatic arc, retroarc hinterland, Sevier fold-thrust belt, and foreland basin locally deformed by Laramide arches, developed during Jurassic to Paleogene Andean-style subduction and terrane accretion. The Sevier belt formed as a foreland-propagating (west to east) wedge mostly during Cretaceous to Paleogene time, and included a western thrust system with aerially extensive thrust sheets that carried thick passive margin strata, and an eastern thrust system that carried thinner strata. Within the Wyoming salient of the Sevier belt, major thrust and fold traces display systematic map-view curvature about an average N-S structural trend, reflecting a component of primary curvature related to sedimentary prism architecture, followed by 60-80% vertical-axis rotation of thrust sheets related to curved fault slip and interaction with Laramide arches at the salient ends. Internal deformation in the western thrust sheets was limited within strong shallower levels, whereas deeper levels underwent shear and vertical flattening near a weak basal fault zone. Internal deformation in the eastern thrust sheets included widespread early layer-parallel shortening (LPS), followed by concentration of slip onto weak fault zones. Approximately 200 km of thin-skin shortening in the Sevier belt was transferred into lower crustal thickening and uplift of an orogenic plateau in the hinterland to the west. Synorogenic strata were deposited in an evolving foreland basin to the east that formed 11 Jurassic with deposition of marine carbonates and evaporites in the Twin Creek Formation and correlative strata (Imlay, 1967), synchronous with early terrane accretion along the western plate margin (Dickinson, 2008). These evaporites subsequently formed detachments during Sevier thrusting (Coogan and Yonkee, 1985). Late Jurassic and Cretaceous to Paleogene strata deposited in the foreland are described in section 4.5. 2.3. Accreted terranes The western part of the Cordilleran orogenic system was constructed on accreted terranes that included: (1) peri-cratonic rocks with fossil and detrital zircon (DZ) signatures typical of North America (Roberts Mountain and Golconda allochthons, Kootenay terrane); (2) Paleozoic to Mesozoic arc and ophiolite rocks of the Intermontane terrane group in Canada, and the Sierra Foothills, Klamath Mountains, and Blue Mountains provinces; and (3) Paleozoic to Mesozoic distal arc and ophiolite rocks of t...

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“…However, it is possible that the geochronological data for the Edwardsburg Fm. constrains Aitken (1991), Rainbird et al (1996) Ross et al (1995), Kendall et al (2004); 2 Devlin & Bond (1988); Hein & McMechan (1994); 3 Devlin & Bond (1988), Devlin (1989), Hein & McMechan (1994), Colpron et al (2002); 4 Evans (1987), Miller & Whipple (1989), Lindsey et al (1990), Miller (1994); 5 Lund et al (2003);6 McCandless (1982), Evans & Green (2003), Lund et al (2010); 7 Crittenden et al (1971Crittenden et al ( , 1983, Link et al (1993), Christie-Blick (1997); 8 Crittenden et al (1971Crittenden et al ( , 1983, Link et al (1993).…”

Section: Broader Implications Of Central Idaho Geological Recordmentioning

confidence: 99%

Chapter 39 The Edwardsburg Formation and related rocks, Windermere Supergroup, central Idaho, USA

Lund

Aleinikoff

Evans

2011

Memoirs

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In central Idaho, Neoproterozoic stratified rocks are engulfed by the Late Cretaceous Idaho batholith and by Eocene volcanic and plutonic rocks of the Challis event. Studied sections in the Gospel Peaks and Big Creek areas of west-central Idaho are in roof pendants of the Idaho batholith. A drill core section studied from near Challis, east-central Idaho, lies beneath the Challis Volcanic Group and is not exposed at the surface. Metamorphic and deformational overprinting, as well as widespread dismembering by the younger igneous rocks, conceals many primary details. Despite this, these rocks provide important links for regional correlations and have produced critical geochronological data for two Neoproterozoic glacial periods in the North American Cordillera.At the base of the section, the more than 700-m-thick Edwardsburg Formation (Fm.) contains interlayered diamictite and volcanic rocks. There are two diamictite-bearing members in the Edwardsburg Fm. that are closely related in time. Each of the diamictites is associated with intermediate composition tuff or flow rocks and the diamictites are separated by mafic volcanic rocks. SHRIMP U-Pb dating indicates that the lower diamictite is about 685 + 7 Ma, whereas the upper diamictite is 684 + 4 Ma. The diamictite units are part of a cycle of rocks from coarse clastic, to fine clastic, to carbonate rocks that, by correlation to better preserved sections, are thought to record an older Cryogenian glacial to interglacial period in the northern US Cordillera.The more than 75-m-thick diamictite of Daugherty Gulch is dated at 664 + 6 Ma. This unit is preserved only in drill core and the palaeoenvironmental interpretation and local stratigraphic relations are non-unique. Thus, the date for this diamictite may provide a date for a newly recognized glaciogenic horizon or may be a minimum age for the diamictite in the Edwardsburg Fm.The c. 1000-m-thick Moores Lake Fm. is an amphibolite facies diamictite in which glacial features have not been observed. However, it is part of a sedimentary cycle from unsorted siliclastic deposits to mud and carbonate deposits. Using lithostratigraphy and available geochronology, the Moores Lake Fm. is correlated with a younger succession of Cryogenian glaciogenic rocks in southeastern Idaho.Traditional correlations of Neoproterozoic rocks in the Cordillera recognize two levels of Cryogenian diamictites. The Edwardsburg and Moores Lake diamictites along the middle Cordillera fit well into the scenario of two glacial events. Because of the correlations, dates that provide ages for the diamictites in central Idaho (and corroborated in southeastern Idaho, Link & Fanning 2008) could constrain the age of correlated glaciogenic deposits elsewhere in the Cordillera. However, in the absence of dates for the glaciogenic diamictites in Canadian and southern US Cordilleran sections, the correlations are considered possible but uncertain.

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Nomenclature and Correlation of Some Upper Precambrian and Basal Cambrian Sequences in Western Utah and Southeastern Idaho

Cited by 66 publications

References 0 publications

Chemostratigraphy of predominantly siliciclastic Neoproterozoic successions: a case study of the Pocatello Formation and Lower Brigham Group, Idaho, USA

Chemostratigraphy of predominantly siliciclastic Neoproterozoic successions: a case study of the Pocatello Formation and Lower Brigham Group, Idaho, USA

Tectonic evolution of the Sevier and Laramide belts within the North American Cordillera orogenic system

Chapter 39 The Edwardsburg Formation and related rocks, Windermere Supergroup, central Idaho, USA

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