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Long, Sean P.

doi:10.1130/ges00783.1

Cited by 70 publications

(49 citation statements)

References 117 publications

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“…Similar fossil assemblages within the Newark Canyon Formation and correlative strata in the foreland indicate limited elevation differences at approximately 120 Ma (Bonde et al, 2015), whereas clumped C-O isotopic signatures in the Sheep Pass Formation and temporally correlative foreland strata indicate paleoelevations of~2 to 3 km in the hinterland by 70 Ma (Snell et al, 2014). Erosional exhumation of the hinterland was limited during later Cretaceous to Paleocene topographic isolation and development of a widespread unconformity across Paleozoic strata (Long, 2013).…”

Section: 1029/2018tc005444mentioning

confidence: 97%

Fault Slip and Exhumation History of the Willard Thrust Sheet, Sevier Fold‐Thrust Belt, Utah: Relations to Wedge Propagation, Hinterland Uplift, and Foreland Basin Sedimentation

et al. 2019

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Zircon (U‐Th)/He (ZHe) and zircon fission track thermochronometric data for 47 samples spanning the areally extensive Willard thrust sheet within the western part of the Sevier fold‐thrust belt record enhanced cooling and exhumation during major thrust slip spanning approximately 125–90 Ma. ZHe and zircon fission track age‐paleodepth patterns along structural transects and age‐distance relations along stratigraphic‐parallel traverses, combined with thermo‐kinematic modeling, constrain the fault slip history, with estimated slip rates of ~1 km/Myr from 125 to 105 Ma, increasing to ~3 km/Myr from 105 to 92 Ma, and then decreasing as major slip was transferred onto eastern thrusts. Exhumation was concentrated during motion up thrust ramps with estimated erosion rates of ~0.1 to 0.3 km/Myr. Local cooling ages of approximately 160–150 Ma may record a period of regional erosion, or alternatively an early phase of limited (<10 km) thrust slip. Propagation of the Sevier wedge front and major thrust slip during the late Early to mid‐Cretaceous were synchronous with increasing subsidence and deposition of thick synorogenic strata in the foreland, crustal thickening in the hinterland, growing igneous activity in the Sierran magmatic arc, and increasing plate convergence rates. Along‐strike, other parts of the Cordilleran retroarc fold‐thrust belt also experienced major shortening during the late Early to mid‐Cretaceous, following a period of earlier Cretaceous quiescence. Late Jurassic shortening was concentrated nearer the arc, and thus mostly in the hinterland at the latitude of northern Utah, related to width and location of the passive‐margin sedimentary wedge relative to the plate margin.

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Section: 1029/2018tc005444mentioning

confidence: 97%

Fault Slip and Exhumation History of the Willard Thrust Sheet, Sevier Fold‐Thrust Belt, Utah: Relations to Wedge Propagation, Hinterland Uplift, and Foreland Basin Sedimentation

et al. 2019

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“…The erg sands were originally sourced mainly from the eastern USA via transcontinental rivers and contain prominent age peaks ( Figure 6I Nevada back arc region. Before extensive burial by the ignimbrite flare-up and other Cenozoic volcanic rocks, sedimentary rocks exposed in Nevada included those making up the Roberts Mountain allochthon, the Golconda allochthon, the Cordilleran miogeocline, and the western Nevada Triassic back arc basin (Van Buer et al 2009;Long 2012). Considered together, the first three of these units are dominated by 1.7-2.0 Ga detrital zircons, with lesser amounts of older and younger zircons (Gehrels et al 1995Riley et al 2000;Harding et al 2000;Spurlin et al 2000; see also Cecil et al 2010, Figure 5).…”

Section: Franciscan Geology Of Northwestern Californiamentioning

confidence: 99%

Detrital zircon U–Pb reconnaissance of the Franciscan subduction complex in northwestern California

Dumitru

Ernst

Hourigan

et al. 2015

International Geology Review

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In northwestern California, the Franciscan subduction complex has been subdivided into seven major tectonostratigraphic units. We report U-Pb ages of ≈2400 detrital zircon grains from 26 sandstone samples from 5 of these units. Here, we tabulate each unit's interpreted predominant sediment source areas and depositional age range, ordered from the oldest to the youngest unit. (1) Yolla Bolly terrane: nearby Sierra Nevada batholith (SNB); ca. 118 to 98 Ma. Rare fossils had indicated that this unit was mostly 151-137 Ma, but it is mostly much younger. (2) Central Belt: SNB; ca. 103 to 53 Ma (but poorly constrained), again mostly younger than previously thought. (3) Yager terrane: distant Idaho batholith (IB); ca. 52 to 50 Ma. Much of the Yager's detritus was shed during major core complex extension and erosion in Idaho that started 53 Ma. An Eocene Princeton River-Princeton submarine canyon system transported this detritus to the Great Valley forearc basin and thence to the Franciscan trench. (4) Coastal terrane: mostly IB, ±SNB, ±nearby Cascade arc, ±Nevada Cenozoic ignimbrite belt; 52 to <32 Ma. (5) King Range terrane: dominated by IB and SNB zircons; parts 16-14 Ma based on microfossils. Overall, some Franciscan units are younger than previously thought, making them more compatible with models for the growth of subduction complexes by progressive accretion. From ca. 118 to 70 Ma, Franciscan sediments were sourced mainly from the nearby Sierra Nevada region and were isolated from southwestern US and Mexican sources. From 53 to 49 Ma, the Franciscan was sourced from both Idaho and the Sierra Nevada. By 37-32 Ma, input from Idaho had ceased. The influx from Idaho probably reflects major tectonism in Idaho, Oregon, and Washington, plus development of a through-going Princeton River to California, rather than radical changes in the subduction system at the Franciscan trench itself.

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“…on April 3, 2013 geosphere.gsapubs.org Downloaded from lying volcanic rocks; this is documented by the widespread unconformity developed at the base of volcanic strata across the northern Basin and Range, and by the unimpeded, channelized eastwest fl ow of Eocene-Oligocene ignimbrites in paleovalleys (e.g., Gans et al, 1989;Henry, 2008;Colgan and Henry, 2009;Van Buer et al, 2009;Long, 2012;Fig. 4).…”

Section: Regional Cenozoic Tectonic and Magmatic Setting Of The Argmentioning

confidence: 99%

“…4B). The great stratigraphic thickness (~7 km) of the Pennsylvanian-Permian Oquirrh Group in the region around the ARG, however, makes the reconstructed Cenozoic unconformity a less viable method for estimating the depth of erosion in this region, as compared to elsewhere in the northern Basin and Range (e.g., Gans et al, 1989;Long, 2012).…”

Section: Geology and Geochronology Of Footwall Rocks Of The Argmentioning

confidence: 99%

Multistage Cenozoic extension of the Albion–Raft River–Grouse Creek metamorphic core complex: Geochronologic and stratigraphic constraints

et al. 2012

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Despite numerous studies on the structural evolution of metamorphic core complexes, there is still little consensus on the set and sequence of processes that bring deep levels of the crust to the surface during extension. This problem is partially related to the fact that core complexes expose polydeformed rocks, the history of which has been challenging to decipher. New geochronological and structural data combined with existing data provide improved insight into the Cenozoic extensional evolution of the Albion-Raft River-Grouse Creek (ARG) metamorphic core complex. The Cenozoic extensional history of the core complex can be divided into several distinct stages based on the geochronol ogy and structure of igneous and metamorphic rocks in the lower plate of the complex combined with the geochronology and regional geologic context of sedimentary and volcanic rocks fl anking the complex. Initial volcanism and plutonism was Eocene age (42-34 Ma), related to a regional southwardyounging magmatic event. The development of high-temperature (sillimanite grade) metamorphic fabrics and mineral assemblages in footwall rocks was mostly Oligocene (ca. 32-25 Ma), synchronous with the diapiric rise and intrusion of evolved plutons to midcrustal depths (~10-15 km), formed by partial melting and remobilization of the deeper crust. There is no evidence for associated volcanism or basin development at the surface during this time span. The metamorphic and plutonic rocks of the core complex apparently remained at depth for ~10-12 m.y. until the Middle Miocene (ca. 14 Ma), when they were exhumed by Basin and Range faulting.Detrital zircon studies of continental basin sediments demonstrate that the synextensional Raft River Basin, bounded by the Albion-Raft River fault system, began to develop along the eastern side of the ARG metamorphic core complex ca. 13.5 Ma, synchronous with footwall cooling and uplift between 13.5 and 7 Ma recorded by apatite fi ssion track ages. The evolution of sediment sources in the Raft River Basin help defi ne three phases of Miocene tectonism.(1) Between 13.5 and 10.5 Ma, rapid slip on the Albion fault, which rooted into a ductilebrittle transition zone represented by the Raft River detachment, exhumed Paleozoic strata that, together with Miocene volcanic rocks, sourced the basin. (2) Between 10.5 and 8.2 Ma, continued slip resulted in a topographic depression fi lled with volcanic rocks and detritus derived from footwall metamorphic and crystalline rocks as well as prior sources. (3) After 8.2 Ma, the sedimentary basin was cut, rotated, and repeated by a set of younger north-south-striking normal faults that extended the basin in an east-west direction, structurally uplifting the basin sedi ments to erosion. These younger faults die out to the south and minimally displace the fault system that bounds the metamorphic core of the Raft River Mountains.The Cenozoic evolution proposed for the ARG metamorphic core complex indicates that the formation of Oligocene granitecored gneiss domes and their high-temp...

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Untitled

Cited by 70 publications

References 117 publications

Fault Slip and Exhumation History of the Willard Thrust Sheet, Sevier Fold‐Thrust Belt, Utah: Relations to Wedge Propagation, Hinterland Uplift, and Foreland Basin Sedimentation

Fault Slip and Exhumation History of the Willard Thrust Sheet, Sevier Fold‐Thrust Belt, Utah: Relations to Wedge Propagation, Hinterland Uplift, and Foreland Basin Sedimentation

Detrital zircon U–Pb reconnaissance of the Franciscan subduction complex in northwestern California

Multistage Cenozoic extension of the Albion–Raft River–Grouse Creek metamorphic core complex: Geochronologic and stratigraphic constraints

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