Age trends in garnet-hosted monazite inclusions from upper amphibolite facies schist in the northern Grouse Creek Mountains, Utah

Hoisch, Thomas D.; Wells, Michael L.; Grove, Marty

doi:10.1016/j.gca.2008.08.012

Cited by 39 publications

(36 citation statements)

References 77 publications

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“…6 and 7;Holdaway, 1971; for an alternative interpretation of the ages of these metamorphic mineral assemblages, see Wells et al, 2012). Asymmetric fabrics and lineations, defi ned (in part) by the growth of elongate bundles of fi brolitic sillimanite, indicate top-to-the-northwest shear during northwest-southeast stretching at amphibolite facies conditions, leading us to conclude that the rise and emplacement of the Oligocene Cassia plutonic complex was intimately related to the dominant deformational and metamorphic event mapped in its country rocks (Strickland et al, 2011a(Strickland et al, , 2011b (Saltzer and Hodges, 1988;Wells et al, 2000) that were interpreted as recording on April 3, 2013 geosphere.gsapubs.org Downloaded from initial cooling of footwall rocks during Eocene motion along the Middle Mountain shear zone (Saltzer and Hodges, 1988;Wells et al, 2000;Hoisch et al, 2008).…”

Section: Geology and Geochronology Of Footwall Rocks Of The Argmentioning

confidence: 89%

“…These earlier conclusions are supported by geo chronologic studies (Egger et al, 2003;Strickland et al, 2011aStrickland et al, , 2011b. Alternatively, studies by Wells et al (1998Wells et al ( , 2012, Harris et al (2007), Hoisch et al (2008), and used metamorphic pressure-temperature estimates in conjunction with geochronol-ogy and thermochronology to argue that many of the high-strain fabrics in the Grouse Creek and Albion Mountains are related to alternating periods of contraction and extension in Cretaceous-Eocene time.…”

Section: Introductionmentioning

confidence: 94%

“…55 Ma along four major thrust systems (e.g., Armstrong, 1963;DeCelles, 1994DeCelles, , 2004Burtner and Nigrini, 1994;Yonkee and Weil, 2011), and that the motion on these systems migrated eastward through time, taking place mostly in the Mesozoic with much less shortening continuing into the Cenozoic (Wiltschko and Dorr 1983;Heller et al, 1986;DeCelles, 1994DeCelles, , 2004Burtner and Nigrini;1994;Yonkee and Weil, 2011;Appendix 1). Geochronologic and thermochronologic studies of the deeper parts of the stratigraphic section exposed in the ARG indicate that this part of the hinterland of the Sevier thrust belt was subject to burial and metamorphism in the Mesozoic (e.g., Hoisch et al, 2002Hoisch et al, , 2008Harris et al, 2007;Wells et al, 2012). These data are compatible with the fact that the estimated original thickness of the pre-Cenozoic stratifi ed section across this region is ~9-10 km (e.g., Compton et al, 1977;Hintze, 1988) and that internal thrust faulting may have thickened this section (Fig.…”

Section: Geology and Geochronology Of Footwall Rocks Of The Argmentioning

confidence: 99%

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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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Section: Geology and Geochronology Of Footwall Rocks Of The Argmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 94%

Section: Geology and Geochronology Of Footwall Rocks Of The Argmentioning

confidence: 99%

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

et al. 2012

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“…Emerging developments in linking 'age to stage', and particularly the use of combined petrography and traceelement data from major and accessory phases (petrochronology), allow high-spatial precision geochronological data to be more firmly linked to the P -T conditions of accessory phase crystallisation reactions (Foster et al, 2004;Gasser et al, 2012;Janots et al, 2008;Rubatto et al, 2013). This is achieved by detailed observation of textural relationships, geochemical analysis of coexisting accessory phases and systematic documentation of trace-element signatures in major phases that 'fingerprint' monazite-forming reactions (Foster et al, 2002(Foster et al, , 2000(Foster et al, , 2004Gasser et al, 2012;Hermann and Rubatto, 2003;Hoisch et al, 2008;Janots et al, 2006Janots et al, , 2007Janots et al, , 2008Janots et al, , 2009Kingsbury et al, 1993;Pyle and Spear, 2003;Rubatto et al, 2006;Smith and Barreiro, 1990;Spear, 2010;Wing et al, 2003). Such advances in metamorphic and geochronological analysis offer the potential to unravel the complex tectonic and thermal evolution of thrust zones associated with inverted metamorphism.…”

Section: Introductionmentioning

confidence: 99%

Developing an inverted Barrovian sequence; insights from monazite petrochronology

Mottram

Warren

Regis

et al. 2014

Earth and Planetary Science Letters

146

141

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Editor: T.M. Harrison Keywords: inverted metamorphism ductile thrusting petrochronology monazite geochronologyIn the Himalayan region of Sikkim, the well-developed inverted metamorphic sequence of the Main Central Thrust (MCT) zone is folded, thus exposing several transects through the structure that reached similar metamorphic grades at different times. In-situ LA-ICP-MS U-Th-Pb monazite ages, linked to pressure-temperature conditions via trace-element reaction fingerprints, allow key aspects of the evolution of the thrust zone to be understood for the first time. The ages show that peak metamorphic conditions were reached earliest in the structurally highest part of the inverted metamorphic sequence, in the Greater Himalayan Sequence (GHS) in the hanging wall of the MCT. Monazite in this unit grew over a prolonged period between ∼37 and 16 Ma in the southerly leading-edge of the thrust zone and between ∼37 and 14.5 Ma in the northern rear-edge of the thrust zone, at peak metamorphic conditions of ∼790 • C and 10 kbar. Monazite ages in Lesser Himalayan Sequence (LHS) footwall rocks show that identical metamorphic conditions were reached ∼4-6 Ma apart along the ∼60 km separating samples along the MCT transport direction. Upper LHS footwall rocks reached peak metamorphic conditions of ∼655 • C and 9 kbar between ∼21 and 16 Ma in the more southerly-exposed transect and ∼14.5-12 Ma in the northern transect. Similarly, lower LHS footwall rocks reached peak metamorphic conditions of ∼580 • C and 8.5 kbar at ∼16 Ma in the south, and 9-10 Ma in the north. In the southern transect, the timing of partial melting in the GHS hanging wall (∼23-19.5 Ma) overlaps with the timing of prograde metamorphism (∼21 Ma) in the LHS footwall, confirming that the hanging wall may have provided the heat necessary for the metamorphism of the footwall. Overall, the data provide robust evidence for progressively downwards-penetrating deformation and accretion of original LHS footwall material to the GHS hanging wall over a period of ∼5 Ma. These processes appear to have occurred several times during the prolonged ductile evolution of the thrust. The preserved inverted metamorphic sequence therefore documents the formation of sequential 'paleothrusts' through time, cutting down from the original locus of MCT movement at the LHS-GHS protolith boundary and forming at successively lower pressure and temperature conditions. The petrochronologic methods applied here constrain a complex temporal and thermal deformation history, and demonstrate that inverted metamorphic sequences can preserve a rich record of the duration of progressive ductile thrusting.

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“…The presence of inclusions of one phase within a host mineral representing a different phase has been exploited to gain insight into the pressure-temperature-compositiontime-deformation (P-T-X-t-D) evolution in studies of igneous and metamorphic systems (e.g., Chopin 1984;Van der Molen and Van Roermund 1986;St-Onge 1987;Perrillat et al 2003;Hoisch et al 2008;Ashley et al 2014). For example, St-Onge (1987) analyzed biotite and plagioclase inclusions from core to rim in garnet to estimate pressure and temperature evolution with net transfer barometry and exchange thermometry, respectively.…”

Section: Introductionmentioning

confidence: 99%

Significance of “stretched” mineral inclusions for reconstructing P–T exhumation history

Ashley

Darling

Bodnar

et al. 2015

Contrib Mineral Petrol

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polymorph kyanite also has the capacity to retain tensile stresses if exhumed to Earth's surface after being trapped as an inclusion in plagioclase at P-T conditions within the kyanite stability field, with the stresses developed during exhumation sufficient to produce a transformation to andalusite. These results highlight the elastic environment that may arise during exhumation and provide a potential explanation of observed inclusions whose stability fields are well removed from P-T paths followed during exhumation.

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Age trends in garnet-hosted monazite inclusions from upper amphibolite facies schist in the northern Grouse Creek Mountains, Utah

Cited by 39 publications

References 77 publications

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

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

Developing an inverted Barrovian sequence; insights from monazite petrochronology

Significance of “stretched” mineral inclusions for reconstructing P–T exhumation history

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