Petrogenesis of the Cretaceous Cassiar batholith, Yukon-British Columbia, Canada: Implications for magmatism in the North American Cordilleran Interior

Driver, Leslie Ann; Creaser, Robert A.; Chacko, Thomas; Erdmer, Philippe

doi:10.1130/0016-7606(2000)112<1119:potccb>2.0.co;2

Cited by 41 publications

(4 citation statements)

References 60 publications

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“…Mackenzie River: The upper crust drained by the main Mackenzie tributaries is composed by a mixture between shales and igneous rocks having granodioritic to granitic composition (Driver et al, 2000;Reeder et al, 1972). The Nd and Sr isotope composition has not been measured on sediments from the Mackenzie tributaries.…”

Section: Provenance Of Fine River Sedimentsmentioning

confidence: 99%

“…(median value ± 2σ/Ön, n=101), Cr/Al = 1.54±0.12×10 -3 (n=106) and Cs/Al = 0.10±0.01×10 -3 (n=50). For the granitic end member, we use data from Driver et al, (2000) and Heffernan, (2004): Ti/Al = 0.030±0.005 (n=60), Cr/Al = 0.13±0.29×10 -3 (n=23) and median Cs/Al = 0.050±0.005×10 -3 (n=50). We calculate that the Mackenzie tributaries contain between 70 and 100% of shale-derived sediments.…”

Section: Provenance Of Fine River Sedimentsmentioning

confidence: 99%

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Tracing weathering regimes using the lithium isotope composition of detrital sediments

Dellinger

Bouchez

Gaillardet

et al. 2017

Geology

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Citation for published item:hellingerD wthieu nd fouhezD tulien nd qillrdetD t¡ er¢ ome nd pureD vetiti nd woureuD tulien @PHIUA 9ring wethering regimes using the lithium isotope omposition of detritl sedimentsF9D qeologyFD RS @SAF ppF RIIERIRF Further information on publisher's website: httpsXGGdoiForgGIHFIIQHGqQVTUIFI Publisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACT 9Lithium (Li) isotopes are a promising tracer of chemical weathering processes for 10 both modern and ancient times. In order to improve the use of Li isotopes in the 11 sedimentary record, here we calibrate the relationship between weathering intensity and 12 detrital Li isotope composition ( 7 Li) using the fine fraction of modern large river 13 sediments. By using independent estimates for sediment provenance to calculate the Li 14 isotope signature of the rock from which the sediments derive through weathering, we 15show that source rock variability (in particular the relative contribution of sedimentary vs. 16 igneous rocks) must be corrected for before using Li isotopes as a weathering proxy. We 17 also show that for rivers draining mountain ranges, the contribution of particles derived 18 from sedimentary rocks to river sediments is correlated to their Li/Al ratio, making it 19 possible to use Li contents to estimate the average source rock composition. Once 20 corrected for bedrock variability, the Li isotope signature defines a negative relationship 21 with the weathering intensity (ratio between silicate weathering rate and total denudation 22 Page 2 of 17 rate) with highest Li isotope fractionation for the highest weathering intensity. 23Altogether, we propose a set of new relationships between weathering, erosion, 24 provenance and Li isotopes that can be used to quantify present-day and paleo-25 weathering using detrital sediment.

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Section: Provenance Of Fine River Sedimentsmentioning

confidence: 99%

Section: Provenance Of Fine River Sedimentsmentioning

confidence: 99%

Tracing weathering regimes using the lithium isotope composition of detrital sediments

Dellinger

Bouchez

Gaillardet

et al. 2017

Geology

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“…The Sierra Nevada Batholith [ Figure 12b] is part of a~35-km-thick , 43-km-wide batholith (Das & Nolet, 1998;Fliedner et al, 1996), just on the border of the Western North America cratonic zone and therefore did not develop on-top of older cratonic material (Driver et al, 2000). The origin of the Sierra Nevada Batholith has been related to deep crustal processes (Cecil et al, 2012;Ducea, 2001;Ratajeski et al, 2005;Reid et al, 1983), a subduction modified mantle source with unclear participation of the lower crust (Coleman & Glazner, 1997;Wenner & Coleman, 2004), or a mixture of mantle and crustal components (Gray et al, 2008).…”

Section: Geochemistry Geophysics Geosystemsmentioning

confidence: 99%

The Record of the Transition From an Oceanic Arc to a Young Continent in the Talamanca Cordillera

Gazel

Hayes

Ulloa

et al. 2019

Geochem Geophys Geosyst

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The Talamanca Cordillera in the Central America Arc (Costa Rica‐Panama) preserves the record of the geochemical evolution from an intraoceanic arc to a juvenile continental arc in an active subduction zone, making it a testbed to explore processes that resulted in juvenile continental crust formation and explore potential mechanisms of early continental crust generation. Here we present a comprehensive set of geochronological, geochemical, and petrological data from the Talamanca Cordillera that tracks the key turning point (12–8 Ma) from the evolution of an oceanic arc depleted in incompatible elements to a juvenile continent. Most plutonic rocks from this transition and postintrusive rocks share striking similarities with average upper continental crust and Archean tonalite, trondhjemite, and granodiorite. We complement these data with seismic studies across the arc. Seismic velocities within the Caribbean Plate (basement of the arc) show a relatively uniform lateral structure consistent with a thick mafic large igneous province. Comparisons of seismic velocity profiles in the middle and lower crust beneath the active arc and remnant Miocene arc suggest a transition toward more felsic compositions as the volcanic center migrated toward the location of the modern arc. Seismic velocities along the modern arc in Costa Rica compared with other active arcs and average continental crust suggest an intermediate composition beneath the active arc in Costa Rica closer to average crust. Our geochemical modeling and radiogenic isotopes systematics suggest that input components from melting of the subducting Galapagos hotspot tracks are required for this compositional change.

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“…Whitehorse suite; Hart 1997), others comprise peraluminous granitoids which were mainly derived from crustal melts (e.g. Cassiar suite; Driver et al 2000), and others consist of variably alkalic, locally silica-undersaturated plutons (e.g. Tombstone Suite; Anderson 1982).…”

Section: Tectonic Settingmentioning

confidence: 99%

Source and redox controls on metallogenic variations in intrusion-related ore systems, Tombstone-Tungsten Belt, Yukon Territory, Canada

Hart¹,

Mair

Goldfarb

et al. 2004

Earth and Environmental Science Transactions of the Royal Socie

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The Tombstone, Mayo and Tungsten plutonic suites of granitic intrusions, collectively termed the Tombstone-Tungsten Belt, form three geographically, mineralogically, geochemically and metallogenically distinct plutonic suites. The granites (sensu lato) intruded the ancient North American continental margin of the northern Canadian Cordillera as part of a single magmatic episode in the mid-Cretaceous (96–90 Ma). The Tombstone Suite is alkalic, variably fractionated, slightly oxidised, contains magnetite and titanite, and has primary, but no xenocrystic, zircon. The Mayo Suite is sub-alkalic, metaluminous to weakly peraluminous, fractionated, but with early felsic and late mafic phases, moderately reduced with titanite dominant, and has xenocrystic zircon. The Tungsten Suite is peraluminous, entirely felsic, more highly fractionated, reduced with ilmenite dominant, and has abundant xenocrystic zircon. Each suite has a distinctive petrogenesis. The Tombstone Suite was derived from an enriched, previously depleted lithospheric mantle, the Tungsten Suite is from the continental crust including, but not dominated by, carbonaceous pelitic rocks, and the Mayo Suite is from a similar sedimentary crustal source, but is mixed with a distinct mafic component from an enriched mantle source.Each suite has a distinctive metallogeny that is related to the source and redox characteristics of the magma. The Tombstone Suite has a Au-Cu-Bi association that is characteristic of most oxidised and alkalic magmas, but also has associated, and enigmatic, U-Th-F mineralisation. The reduced Tungsten Suite intrusions are characterised by world-class tungsten skarn deposits with less significant Cu, Zn, Sn and Mo anomalies. The Mayo Suite intrusions are characteristically gold-enriched, with associated As, Bi, Te and W associations. All suites also have associated, but distal and lower temperature Ag-Pb- and Sb-rich mineral occurrences. Although processes such as fractionation, volatile enrichment and phase separation are ultimately required to produce economic concentrations of ore elements from crystallising magmas, the nature of the source materials and their redox state play an important role in determining which elements are effectively concentrated by magmatic processes

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Petrogenesis of the Cretaceous Cassiar batholith, Yukon-British Columbia, Canada: Implications for magmatism in the North American Cordilleran Interior

Cited by 41 publications

References 60 publications

Tracing weathering regimes using the lithium isotope composition of detrital sediments

Tracing weathering regimes using the lithium isotope composition of detrital sediments

The Record of the Transition From an Oceanic Arc to a Young Continent in the Talamanca Cordillera

Source and redox controls on metallogenic variations in intrusion-related ore systems, Tombstone-Tungsten Belt, Yukon Territory, Canada

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