Provenance of Franciscan graywackes in coastal California

Dickinson, William R.; Ingersoll, Raymond V.; Cowan, Darrel S.; Helmold, Kenneth P.; Suczek, Christopher A.

doi:10.1130/0016-7606(1982)93<95:pofgic>2.0.co;2

Cited by 80 publications

(49 citation statements)

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“…Textural immaturity of these feldspathic metasandstones precludes long Proterozoic transport distances. The lithic-feldspathic mineralogy reflects a transitional-continental-block provenance (Dickinson et al, 1982). U-Pb age spectra suggest that a plausible source of these distinctive Eastern Hayfork blocks was the Antelope Mountain Quartzite, an allochthon in the Eastern Klamath Yreka subterrane (Wallin et al, 2000;Lindsley-Griffin et al, 2006).…”

Section: Detrital Zircon U-pb Datamentioning

confidence: 99%

“…In contrast, the neoblastic prehnite-pumpellyite ± aragonite metamorphic grade typically developed in the Central belt (Terabayashi and Maruyama, 1998) apparently was established during shallow underflow of the me´lange immediately after Late Cretaceous deposition (Blake et al, 1988). Ingersoll (1978Ingersoll ( , 1979Ingersoll ( , 1983, Dickinson et al (1982) and Dickinson (1985). The Coastal belt is underlain by poorly exposed, deeply weathered rocks.…”

Section: Structural-tectonic Relationshipsmentioning

confidence: 99%

“…Deeply buried, thickest parts are albitized, with rare development of zeolites, but the GVG is virtually unrecrystallized (Dickinson et al, 1969). Abundant current features in the turbiditic sandstones indicate Klamath-Sierran provenance, as do detrital minerals and rock clasts (Dickinson and Rich, 1972;Ingersoll, 1978Ingersoll, , 1983Dickinson et al, 1982;Suchecki, 1984). Figure 5 shows ranges in petrofacies and inferred transport directions of the coeval GVG-Franciscan forearc-trench couplet.…”

Section: Rock Unitsmentioning

confidence: 99%

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Mesozoic transpression, transtension, subduction and metallogenesis in northern and central California

2008

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Middle Paleozoic to Middle Jurassic terrane assemblies in the Klamaths and Sierran Foothills consist of mafic-ultramafic complexes + fine-grained terrigenous strata derived from previously accreted continental-margin belts. Sutured oceanic terranes reflect c. 230 Myr of margin-parallel slip involving chiefly transtension and transpression. Quartzofeldspathic clastic rocks and blueschists ± eclogites are very rare. Little devolatilization occurred at magmagenic depths; hence, coeval hydrothermal ore deposits and granitoids are uncommon. In contrast, nearly head-on Cretaceous subduction of the Farallon plate generated the massive Klamath-Sierra Nevada volcanicplutonic arc, reflecting dewatering of the eastward descending oceanic lithosphere in the magmagenic zone. Immature Great Valley forearc and Franciscan trench deposits shed from the arc record c. 70 Myr. of rapid crustal growth. Au-bearing solutions rising from magmagenic depths, exsolved from plutons, and expelled from heated wall rocks were mobilized attending arc construction. Precipitation of gold-bearing quartz veins

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Section: Detrital Zircon U-pb Datamentioning

confidence: 99%

Section: Structural-tectonic Relationshipsmentioning

confidence: 99%

Section: Rock Unitsmentioning

confidence: 99%

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Mesozoic transpression, transtension, subduction and metallogenesis in northern and central California

2008

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“…These nappes show accretionary (incorporation into subduction complex) ages that young structurally downward (Maxwell, 1974;Blake et al, 1984;Wakabayashi, 1992Wakabayashi, , 2015Ernst et al, 2009;Dumitru et al, 2010Dumitru et al, , 2015Snow et al, 2010;Wakabayashi and Rowe, 2015). Geochemical and geochronological evidence from coeval GVG and Franciscan strata indicate a similar North American source (Dickinson et al, 1982;DeGraaff-Surpless et al, 2002;Joesten et al, 2004;Tripathy et al, 2005;Ernst et al, 2009;Dumitru et al, 2010Dumitru et al, , 2015Snow et al, 2010;Jacobson et al, 2011;Sharman et al, 2015).…”

Section: Franciscan Complexmentioning

confidence: 99%

“…2; Irwin, 1960;Bailey et al, 1964Bailey et al, , 1970McLaughlin et al, 1982;Wakabayashi and Rowe, 2015). Most of the mélange is interpreted to be sedimentary in origin with evidence depicting upper-plate-derived (North American) submarine debris depositing into the trench (Jacobson, 1978;Dickinson et al, 1982;MacPherson et al, 1990;Jacobson et al, 2011;Wakabayashi, 2015). Greene and Surpless | Facies architecture and provenance of a boulder-conglomerate, Panoche Formation GEOSPHERE | Volume 13 | Number 3…”

Section: Franciscan Complexmentioning

confidence: 99%

Facies architecture and provenance of a boulder-conglomerate submarine channel system, Panoche Formation, Great Valley Group: A forearc basin response to middle Cretaceous tectonism in the California convergent margin

Greene¹,

Surpless²

2017

Geosphere

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Tectonic reorganization induced by a rapid increase in plate motion obliquity and rate beginning at ca. 100 Ma affected California's Andean-style convergent margin, with concomitant changes in the accretionary prism of the Franciscan Complex, the Great Valley forearc basin, and the Sierran continental arc. Using facies analysis and a combined provenance approach, we suggest that this ca. 100 Ma tectonic signal is preserved in a Cenomanian (Upper Cretaceous) boulder-conglomerate outcrop along the San Luis Reservoir (SLR) in the southern Great Valley, which represents the thickest and coarsest deep-water deposit ever described in the Great Valley Group (GVG). We document a 1.8-km-thick by 4-km-long depositional-dip profile of an interpreted SE-directed (axial) submarine channel system that is part of a conglomeratic package that stretches 20 km along the east-central Diablo Range. Our facies analysis of the SLR area documents five facies associations within four aggradational channel complex sets, followed by regional abandonment.Sandstone petrography and mudrock geochemical data suggest a dissected continental Sierra Nevadan arc source. Conglomerate clast counts show abundant ophiolitic-type clasts that may be derived from the Coast Range Ophiolite and/or the Western Sierra Nevada Metamorphic Belt. Detrital-zircon geochronology data also indicate western and central Sierra Nevadan sources; however, we interpret an anomalous (relative to other Cenomanian localities) 105-95 Ma zircon population to indicate the initial erosional products from the volcanic carapace associated with the Late Cretaceous magmatic flare-up within the eastern Sierran arc. This flare-up has been linked to an increase in arc-parallel plate motion that induced deformation along shear zones in the eastern Sierra Nevada, allowing for widespread plutonism. Our provenance interpretation makes the SLR area the earliest Upper Cretaceous GVG locality to receive significant detritus from the flare-up, effectively linking tectonic plate motion changes and coarse-grained, deep-water forearc sedimentation.

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Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial‐exposure duration, and fluid exchange with cosubducted metabasites

2013

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[1] Interpretation of graywacke provenance has long been used to evaluate the record of tectonic process in orogenic belts. Our geochemical data from graywackes of the Franciscan subduction complex, California, show that the connection between sedimentary record and geologic processes may be more complex than previously believed. Trace elements and Nd-Sr-Pb isotopes of Franciscan graywackes indicate two sources types. One group lacking negative Eu anomaly (Eu/Eu * > 0.9), shows slightly concave-up heavy rare earth elements, arc-like trace element patterns, and western Pacific island arc-like Pb isotopes, reflecting derivation from older accreted oceanic-arc terranes in the Sierra Nevada-Klamath Mountains. The other group displays small negative Eu anomalies, with trace element patterns resembling post-Archean Australian shale and Pb isotopes similar to Jurassic-Cretaceous Sierran batholith. There is no systematic separation of these two groups by depositional ages. Thus, geochemistry of the graywackes may partly reflect variation in location of sediment delivery systems, rather than solely reflecting evolution of the neighboring arc. Variation of Nd-Sr isotopes with stratigraphic-age for the graywackes mimics the trends of the coeval Great Valley Group clastic-rocks, suggesting that (1) they share the same sediment sources, (2) there are no "exotic" sediment sources that fed the Franciscan trench, and (3) burial-exposure cycles for Franciscan clastic rocks were comparatively brief. Comparison of Franciscan graywacke and metabasite geochemistry corroborates earlier conclusions that metabasites had little or no chemical exchange with fluids from cosubducted graywacke. Detrital zircon age populations, major element chemistry, and detrital framework modes, when compared to our data suggest that the former three parameters underrepresent the mafic component of clastic sediment provenance.Citation: Ghatak, A., A. R. Basu, and J. Wakabayashi (2013), Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial-exposure duration, and fluid exchange with cosubducted

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Provenance of Franciscan graywackes in coastal California

Cited by 80 publications

References 0 publications

Mesozoic transpression, transtension, subduction and metallogenesis in northern and central California

Mesozoic transpression, transtension, subduction and metallogenesis in northern and central California

Facies architecture and provenance of a boulder-conglomerate submarine channel system, Panoche Formation, Great Valley Group: A forearc basin response to middle Cretaceous tectonism in the California convergent margin

Implications of Franciscan Complex graywacke geochemistry for sediment transport, provenance determination, burial‐exposure duration, and fluid exchange with cosubducted metabasites

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