Granite provenance and intrusion in arcs: Evidence from diverse zircon types in Big Bear Lake Intrusive Suite, USA

Barth, Andrew P.; Wooden, Joseph L.; Mueller, Paul A.; Economos, Rita C.

doi:10.1016/j.lithos.2015.12.009

Cited by 26 publications

(15 citation statements)

References 63 publications

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“…Age data sources: Coast Plutonic Complex, Gehrels et al (); North Cascades, Miller, Paterson, et al, ; Idaho Batholith, Gaschnig et al (); Sierra Nevada, Chapman et al (); Mojave, Needy et al (). Hafnium‐isotope data sources: Coast Plutonic Complex, Cecil et al (); North Cascades, Matzel et al () (calculated from whole‐rock Nd data using the formula εHf = 1.36 * εNd + 2.95); Idaho Batholith, Gaschnig et al (); Sierra Nevada, Lackey et al () and Shaw et al (); and Transverse Ranges, Barth et al ().…”

Section: Discussionmentioning

confidence: 99%

Transfer of Metasupracrustal Rocks to Midcrustal Depths in the North Cascades Continental Magmatic Arc, Skagit Gneiss Complex, Washington

et al. 2017

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The metasupracrustal units within the north central Chelan block of the North Cascades Range, Washington, are investigated to determine mechanisms and timescales of supracrustal rock incorporation into the deep crust of continental magmatic arcs. Zircon U‐Pb and Hf‐isotope analyses were used to characterize the protoliths of metasedimentary and metaigneous rocks from the Skagit Gneiss Complex, metasupracrustal rocks from the Cascade River Schist, and metavolcanic rocks from the Napeequa Schist. Skagit Gneiss Complex metasedimentary rocks have (1) a wide range of zircon U‐Pb dates from Proterozoic to latest Cretaceous and (2) a more limited range of dates, from Late Triassic to latest Cretaceous, and a lack of Proterozoic dates. Two samples from the Cascade River Schist are characterized by Late Cretaceous protoliths. Amphibolites from the Napeequa Schist have Late Triassic protoliths. Similarities between the Skagit Gneiss metasediments and accretionary wedge and forearc sediments in northwestern Washington and Southern California indicate that the protolith for these units was likely deposited in a forearc basin and/or accretionary wedge in the Early to Late Cretaceous (circa 134–79 Ma). Sediment was likely underthrust into the active arc by circa 74–65 Ma, as soon as 7 Ma after deposition, and intruded by voluminous magmas. The incorporation of metasupracrustal units aligns with the timing of major arc magmatism in the North Cascades (circa 79–60 Ma) and may indicate a link between the burial of sediments and pluton emplacement.

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Section: Discussionmentioning

confidence: 99%

Transfer of Metasupracrustal Rocks to Midcrustal Depths in the North Cascades Continental Magmatic Arc, Skagit Gneiss Complex, Washington

et al. 2017

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“…Both regions also have potential sources of unradiogenic ca. 100-81 Ma zircons: sediment eroded from the Idaho batholith that intrudes the edge of northwestern Laurentia (Gaschnig et al, 2011) and Late Cretaceous plutons that intrude the Mojave terrane in southwestern Laurentia (Barth et al, 2016;Fisher et al, 2017), respectively. The initial Hf-isotope signature and age peaks of the Proterozoic zircons from sediment sources in southwestern and northwestern Laurentia cover a similar range and are not diagnostic (Sauer et al, 2017a).…”

Section: Detrital-zircon Characteristics and Potential Sourcesmentioning

confidence: 99%

Provenance and metamorphism of the Swakane Gneiss: Implications for incorporation of sediment into the deep levels of the North Cascades continental magmatic arc, Washington

et al. 2018

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The Swakane Gneiss, interpreted to represent sedimentary strata metamorphosed at 8-12 kbar, is the deepest exposed crustal levels within the exhumed North Cascades continental magmatic arc, yet the nature and age of its protolith and the mechanism by which it was transported to deep-crustal levels remains unclear. Zircons from 11 paragneiss and schist samples were analyzed for U-Pb age and Hf-isotope composition in order to investigate the tectonic history of the Swakane Gneiss from protolith deposition to metamorphism within the North Cascades arc. Zircons interpreted to have crystallized in situ during metamorphism and/or melt-crystallization within the Swakane Gneiss at depth have ca. 74-66 Ma ages. Detrital-zircon age and Hf-isotope characteristics demonstrate provenance shifts that correlate with maximum depositional ages of ca. 93-81 Ma. Samples deposited between ca. 93 and 88 Ma have dominantly Mesozoic age peaks with initial ε Hf values between depleted mantle and chondritic uniform reservoir (CHUR), whereas ca. 86-81 Ma sample show the addition of distinct Proterozoic populations (ca. 1380 and 1800-1600 Ma) and Late Cretaceous zircons with unradiogenic Hf-isotope compositions. Similar detrital-zircon age and Hf-isotope patterns are observed in several Upper Cretaceous forearc and accretionary wedge units between southern California and Alaska along the North American continental margin. The connection between the Swakane Gneiss and these potential protoliths located outboard of Cordilleran arc systems indicate burial by either underplating of accretionarywedge sediments or underthrusting of forearc sediments. Therefore, the protolith and incorporation history for the Swakane Gneiss is likely similar to those of deep crustal metasedimentary units elsewhere in the North Cascades (i.e., the Skagit Gneiss Complex) and to the south along the continental margin (i.e., the Pelona-Orocopia-Rand schists and Schist of Sierra de Salinas). These observations suggest that burial of sediment outboard of continental magmatic arc systems may be a major mechanism for the transfer of sediment to the deep levels of continental arcs.

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“…The euhedral to subhedral shape of the grain is consistent with this view as well as the growth bands observed in natural light that correspond to oscillatory zoning, a common feature of magmatically grown zircon (e.g., Hoskin and Schaltegger, 2003). The REE pattern of the central part is also typical of magmatic zircon (e.g., Barth et al, 2016), with steep HREE Bruguier et al Precambrian Research xxx (xxxx) xxx-xxx pattern (Gd/Yb N > 30) and a prominent positive Ce anomaly. The megacryst displays a very low Th/U ratio (mean value of 0.0009 for the 29 analyses used in the age calculation), largely less than 0.1, a threshold below which zircon is classically considered as solid state grown (e.g., Williams and Claesson, 1987;Rubatto, 2002;Gilotti et al, 2014) but that has also been attributed to suprasolidus metamorphic zircons crystallized from a melt.…”

Section: Signature Stability and Behaviour Of Chemical And Isotopic mentioning

confidence: 96%

A case study of in situ analyses (major and trace elements, U-Pb geochronology and Hf-O isotopes) of a zircon megacryst: Implication for the evolution of the Egéré terrane (Central Hoggar, Tuareg Shield, Algeria)

Bruguier

Caby

Bosch

et al. 2020

Precambrian Research

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Granite provenance and intrusion in arcs: Evidence from diverse zircon types in Big Bear Lake Intrusive Suite, USA

Abstract: 2016-11-02T18:49:00

Cited by 26 publications

References 63 publications

Transfer of Metasupracrustal Rocks to Midcrustal Depths in the North Cascades Continental Magmatic Arc, Skagit Gneiss Complex, Washington

Transfer of Metasupracrustal Rocks to Midcrustal Depths in the North Cascades Continental Magmatic Arc, Skagit Gneiss Complex, Washington

Provenance and metamorphism of the Swakane Gneiss: Implications for incorporation of sediment into the deep levels of the North Cascades continental magmatic arc, Washington

A case study of in situ analyses (major and trace elements, U-Pb geochronology and Hf-O isotopes) of a zircon megacryst: Implication for the evolution of the Egéré terrane (Central Hoggar, Tuareg Shield, Algeria)

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