California Coast Range ophiolite: Composite Middle and Late Jurassic oceanic lithosphere

Hopson, Clifford A.; Mattinson, James M.; Pessagno, Emile A.; Luyendyk, Bruce P.

doi:10.1130/2008.2438(01)

Cited by 84 publications

(108 citation statements)

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“…However, this subduction zone lay far seaward of the Sierran Foothills to the south, opening the wide forearc basin of the Great Valley of California, the western basement of which consisted of Coast Range ophiolite trapped by the plate step-out (Hopson et al, 2008). Nearly head-on convergence resulted in massive calcalkaline volcanismplutonism, providing the source for GVG and Franciscan clastic sediments during most of mid-and Late Cretaceous and into Paleogene time.…”

Section: Discussionmentioning

confidence: 99%

“…To the NW, Lower Cretaceous GVG strata rest on rocks of the Eastern Klamath terrane and associated Early Cretaceous stocks (Constenius et al, 2000). Basal sedimentary units in the western GVG were deposited on the essentially unmetamorphosed Middle Jurassic Coast Range ophiolite (Bailey et al, 1970;Shervais et al, 2005;Hopson et al, 2008). All of these units belong to the North American plate.…”

Section: Geological Overview Of the California Coast Rangesmentioning

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: Discussionmentioning

confidence: 99%

Section: Geological Overview Of the California Coast Rangesmentioning

confidence: 99%

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

2008

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“…2; Bailey et al, 1970;Cady, 1975;Hopson et al, 1981Hopson et al, , 2008Robertson, 1989;Bartow and Nilsen, 1990;Stern and Bloomer, 1992). In the eastern San Joaquin subbasin, the GVG rests unconformably on a compilation of metamorphosed Jurassic island arc terranes and ophiolitic fragments of the WSNMB ( Fig.…”

Section: Introductionmentioning

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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“…The Franciscan of Central and Northern California is emplaced beneath the Coast Range Ophiolite (CRO), which contains plagiogranites that yield zircons at many locations that date between ∼170 and 161 Ma (Hopson et al 1981(Hopson et al , 2008Shervais et al 2005). The 150-155-Ma ages for Franciscan blueschists indicate that subduction must have begun along the western margin of the North American Plate soon after formation of the CRO, between about 160 and 155 Ma.…”

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confidence: 99%

First ⁴⁰Ar-³⁹Ar Ages from Low-T Mafic Blueschist Blocks in a Franciscan Mélange near San Simeon: Implications for Initiation of Subduction

Ukar

Cloos

Vasconcelos

2012

The Journal of Geology

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California Coast Range ophiolite: Composite Middle and Late Jurassic oceanic lithosphere

Cited by 84 publications

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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

First ⁴⁰Ar-³⁹Ar Ages from Low-T Mafic Blueschist Blocks in a Franciscan Mélange near San Simeon: Implications for Initiation of Subduction

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California Coast Range ophiolite: Composite Middle and Late Jurassic oceanic lithosphere

Cited by 84 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

First 40Ar-39Ar Ages from Low-T Mafic Blueschist Blocks in a Franciscan Mélange near San Simeon: Implications for Initiation of Subduction

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First ⁴⁰Ar-³⁹Ar Ages from Low-T Mafic Blueschist Blocks in a Franciscan Mélange near San Simeon: Implications for Initiation of Subduction