Late Paleozoic and Triassic plume-derived magmas in the Canadian Cordillera played a key role in continental crust growth

Lapierre, Henriette; Bosch, Delphine; Tardy, Marc; Struik, Lambertus C.

doi:10.1016/s0009-2541(03)00224-9

Cited by 26 publications

(21 citation statements)

References 49 publications

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“…Island arc-related terranes consist of a Triassic to Early Jurassic fringing continental margin arc (Quesnellia) and a more distal, Triassic to Middle Jurassic island arc (Stikinia), both of which contain volcanic, volcaniclastic, and sedimentary rocks and associated cogenetic plutons (Marsden and Thorkelson, 1992;Anderson, 1993;Currie and Parrish, 1997;Patchett and Gehrels, 1998;MacIntyre et al, 2001;English and Johnston, 2005). These island-arc terranes are separated by a long-lived, argillite-matrix mélange terrane (Cache Creek) that contains remnants of oceanic plateaus tectonically intercalated with PermianMiddle Jurassic metasedimentary rocks consisting of ribbon chert, argillite, graywacke, sandstone, conglomerate, and limestone (Cordey et al, 1987;Nelson and Mihalynuk, 1993;Mihalynuk et al, 1994;Orchard et al, 2001;Struik, 2001;Struik et al, 2001;Tardy et al, 2001;Lapierre et al, 2003). Lateral tectonic collision of the Stikinia-Cache Creek-Quesnellia terranes may have been diachronous from north to south, associated with progressive oroclinal closure, with initial collision recorded by early Middle Jurassic deformation in the north and progressive southward younging of deformation and final closure between the Toarcian and Bajocian (Thomson et al, 1986;Ricketts et al, 1992;Anderson, 1993;Nelson and Mihalynuk, 1993;Mihalynuk et al, 1994).…”

Section: Northern Cordillera Correlations: Intermontane Superterranementioning

confidence: 99%

Late Jurassic magmatism, metamorphism, and deformation in the Blue Mountains Province, northeast Oregon

Schwartz

Snoke

Cordey

et al. 2011

Geological Society of America Bulletin

100

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International audienceAn early to mid-Mesozoic record of sedimentation, magmatism, and metamorphism is well developed in the Blue Mountains Province of northeast Oregon. Detailed studies-both north and south of the Blue Mountains Province (e. g., terranes of the Intermontane belt, Klamath Mountains, and western Sierra Nevada) have documented a complex Middle to Late Jurassic orogenic evolution. However, the timing of magmatic, metamorphic, and deformational events in the Blue Mountains, and the significance of these events in relationship to other terranes in the western North American Cordillera remain-poorly understood. In this study, we investigate the structural, magmatic, and metamorphic histories of brittle to semibrittle deformation zones that indicate widespread Late Jurassic orogenesis in the Blue Mountains Province. Folding and faulting associated with contractional deformation are primarily localized along terrane boundaries (e. g., Baker-Wallowa and Baker-Izee-Olds Ferry boundaries) and within the composite Baker oceanic melange terrane (e. g., Bourne-Greenhorn subterrane boundary). These brittle to semibrittle deformation zones are broadly characterized by the development of E-W-oriented slaty to spaced cleavage in fine-grained metasedimentary rocks of the Baker terrane (e. g., Elkhorn Ridge Argillite), approximately N-S-bivergent folding, and N- and S-dipping reverse and thrust faulting on opposite flanks of the Baker terrane. Similarly oriented contractional features are also present in late Middle Triassic to early Late Jurassic (i.e., Oxfordian Stage, ca. 159 Ma) sedimentary rocks of the John Day and Huntington areas of northeast Oregon. Radiometric age constraints from youngest detrital zircons in deformed sedimentary rocks and crystallization ages of postkinematic plutons, which intrude the deformation zones, limit deformation to between ca. 159 and ca. 154 Ma. We suggest that the widespread, approximately N-S-directed contractional features in the Blue Mountains Province record a short-lived, intense early Late Jurassic deformational event and preserve an example of upper-crustal strain localization associated with terminal arc-arc collision between the Olds Ferry and Wallowa island-arc terranes. The age interval of deformation in the Blue Mountains Province is younger than Middle Jurassic deformation in the Canadian Cordillera and Klamath Mountains (Siskiyou orogeny) and predates classic Nevadan orogenesi

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Section: Northern Cordillera Correlations: Intermontane Superterranementioning

confidence: 99%

Late Jurassic magmatism, metamorphism, and deformation in the Blue Mountains Province, northeast Oregon

Schwartz

Snoke

Cordey

et al. 2011

Geological Society of America Bulletin

100

View full text Add to dashboard Cite

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“…Juvenile crustal growth can also happen by accretion of oceanic plateaux (hotspot products) to arcs and continental crust, as recently occurred where the Ontong-Java Plateau collided with the Solomon arc (Mann and Taira 2004). Accretion of oceanic hotspot constructions such as plateaux and seamount chains is thought to have contributed greatly to Mesozoic crust formation in the Canadian Cordillera (Lapierre et al 2003), growth of coastal promontories of Kamchatka (Portnyagin et al 2008) and elsewhere in the circum-Pacific region. The relative importance of arc and hotspot magmas for growth of juvenile continental crust is reflected by the models of Hawkesworth and Kemp (2006), who infer a mixture of 8% hotspot and 92% arc for the formation of new continental crust on average.…”

Section: Additions (Au)mentioning

confidence: 99%

Yin and yang of continental crust creation and destruction by plate tectonic processes

Stern

Scholl

2010

International Geology Review

202

107

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Earth's continental crust today is both created and destroyed by plate tectonic processes, a balance that is encapsulated by the traditional Chinese concept of yin-yang, whereby dualities act in concert as well as in opposition. Yin-yang conceptualizations of crustal growth and destruction are mostly related to plate tectonics; both occur mostly at subduction zones, by arc magmatic creation and by subduction removal. Crust is also created and destroyed by processes unrelated to plate tectonics, including losses by lower crust foundering and additions at hotspots. At present, creation and destruction of continental crust is either in balance (∼3.2 km 3 /year, or 3.2 AU) or more crust is being destroyed than created; the uncertainty comes from unknown deep losses of continental crust at collision zones and due to lower crustal foundering. The yinyang creation-destruction balance changes over a supercontinent cycle, with crustal growth being greatest during supercontinent break-up due to high magmatic flux at new arcs and crustal destruction being greatest during supercontinent amalgamation due to subduction of continental material and increased sediment flux due to orogenic uplift. These conclusions challenge the widely held view that continental crust volume has increased over time due to plate tectonic activity; it is just as likely that this volume has decreased.

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“…1) (Lapierre et al 2003), and 3) an allochthonous tectonic unit of mafic volcanic rocks, the Nilüfer Unit of northwest Turkey, may represent a Palaeo-Tethyan, Triassic oceanic plateau accreted to the Laurasian margin during the Late Triassic (NUP: Fig. 1) (Okay et al 2002).…”

Section: Magmatismmentioning

confidence: 99%

“…Apart from some evidence for oceanic hotspot magmatism at 227 Ma (Lapierre et al 2003) and 210 Ma (Kerr et al 2000), most Late Triassic-Early Jurassic large igneous province magmatism and inferred mantle plume impacts affected the continents.…”

Section: "Oceanic" Casementioning

confidence: 99%

Episodicity of Mesozoic terrane accretion along the Pacific margin of Gondwana: implications for superplume-plate interactions

Vaughan

Livermore

2005

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A review of evidence for deformation and terrane accretion on the Late Triassic-Early Jurassic margins of Pangaea and the mid-Cretaceous margins of the palaeo-Pacific ocean shows that deformation was global and synchronous with probable superplume events. Late Triassic-Early Jurassic deformation appears to be concentrated in the period 202–197 Ma and was coeval with eruption of the Central Atlantic Magmatic Province, onset of Pangaea break-up, a period of extended normal magnetic polarity and a major mass extinction event, all possible expressions of a superplume event. Mid-Cretaceous deformation occurred in two brief periods, the first from approximately 116 Ma to 110 Ma in the west palaeo-Pacific and the second from roughly 105 Ma to 99 Ma in the east palaeo-Pacific, with both events possibly represented in northeast Siberia. This deformation was coeval with eruption of major oceanic plateaux, core-complex formation and rifting of New Zealand from Gondwana, the Cretaceous normal polarity epoch, and a major radiation of flowering plants and several animal groups, all linked with the mid-Cretaceous superplume event. A simple unifying mechanism is presented suggesting that large continental or oceanic plates, when impacted by a superplume, tend to break-up/reorganize, associated with gravitational spreading away from a broad, thermally generated topographic high and with a resulting short-lived pulse of plate-marginal deformation and terrane accretion.

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Late Paleozoic and Triassic plume-derived magmas in the Canadian Cordillera played a key role in continental crust growth

Cited by 26 publications

References 49 publications

Late Jurassic magmatism, metamorphism, and deformation in the Blue Mountains Province, northeast Oregon

Late Jurassic magmatism, metamorphism, and deformation in the Blue Mountains Province, northeast Oregon

Yin and yang of continental crust creation and destruction by plate tectonic processes

Episodicity of Mesozoic terrane accretion along the Pacific margin of Gondwana: implications for superplume-plate interactions

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