Significance of the provincial signature of Early Permian faunas of the eastern Klamath terrane

Stevens, Calvin H.; Yancey, Thomas E.; Hanger, Rex Alan

doi:10.1130/spe255-p201

Cited by 34 publications

(15 citation statements)

References 13 publications

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“…This scenario is supported by biogeographic analyses of Permian fauna in the eastern Klamath terrane, which Stevens et al (1990) suggested formed at least 5000 km outboard of the Cordilleran margin. A fourth model calls on changes in subduction geometry to explain the interplay between arc magmatism and accretion of ocean-floor assemblages ( Fig.…”

Section: Geologic and Tectonic Frameworkmentioning

confidence: 92%

Tectonic implications of detrital zircon data from Paleozoic and Triassic strata in western Nevada and Northern California

Gehrels¹,

Dickinson²,

Darby³

et al. 2000

Paleozoic and Triassic Paleogeography and Tectonics of Western Nevada and Northern California

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U-Pb analyses of detrital zircons from various allochthonous assemblages of Paleozoic and early Mesozoic age in western Nevada and northern California yield new constraints on the sediment dispersal patterns and tectonic evolution of western North America. During early Paleozoic time, a large submarine fan system formed in slope, rise, basinal, and perhaps trench settings near the continental margin, west of continental shelf deposits of the Cordilleran miogeocline. Our detrital zircon data suggest that most of the detritus in this fan system along the western U.S

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Section: Geologic and Tectonic Frameworkmentioning

confidence: 92%

Tectonic implications of detrital zircon data from Paleozoic and Triassic strata in western Nevada and Northern California

Gehrels¹,

Dickinson²,

Darby³

et al. 2000

Paleozoic and Triassic Paleogeography and Tectonics of Western Nevada and Northern California

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“…Tethyan faunas in some of the limestone blocks were pantropic forms that migrated into island chains of the proto-Pacifi c Ocean west of Mesozoic North America (Miller and Wright, 1987;Newton, 1988). Tectonic transport estimated from paleofaunal interpretations as thousands of kilometers of longitude was required to bring the Tethyan limestones to the Cordilleran continental margin (Stevens et al, 1990(Stevens et al, , 1991Belasky and Stevens, 2006).…”

Section: Continental Truncationmentioning

confidence: 98%

“…Locally severe dislocation of Western Hayfork volcanic rocks to the condition of broken formation can then be understood as a structural overprint imposed during accretion of an intraoceanic arc assemblage to the edge of the growing continent. Limestone cobbles in the Western Hayfork belt contain McCloud fauna , native to tropical island settings, which from paleofaunal analysis were initially at least 1000 km and possibly >5000 km from the continental margin of Laurentia (Stevens et al, 1990).…”

Section: Western Hayfork-rattlesnake Creek Beltsmentioning

confidence: 99%

Accretionary Mesozoic–Cenozoic expansion of the Cordilleran continental margin in California and adjacent Oregon

2008

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The Mesozoic-Cenozoic Cordilleran orogen of California includes multiple accretionary belts incorporated sequentially into the continental margin since Middle Triassic time. Accreted tectonic elements include subduction complexes assembled along the Cordilleran margin, intraoceanic island arcs attached to the continental margin by Jurassic arc-continent collision, and subduction complexes associated with the fl anks of the exotic island arcs. Systematic analysis of areal relations and geochronological data displayed on subregional geologic maps and summary chronostratigraphic diagrams allows the punctuated but quasi-continuous pattern of tectonic accretion to be discerned. Stitching plutons and sedimentary overlap successions constrain the times that successive accretionary belts were juxtaposed and amalgamated into the edge of the continental block. In the Klamath Mountains and Sierra Nevada, a continental-margin magmatic arc of Triassic-Jurassic age includes volcanic and plutonic components built upon and intruded into deformed Paleozoic assemblages that were accreted to the Laurentian margin before Middle Triassic time. The native arc assemblage is separated from intraoceanic Triassic-Jurassic arc assemblages exposed farther west by a compound suture belt of mélange and broken formation derived from the remnant ocean basin that separated the east-facing intraoceanic arc system from the Cordilleran margin. Polarity reversal after Middle to Late Jurassic arc-continent collision was followed by accretion of a disrupted ophiolitic belt forming mafi c basement in the subsurface of the Great Valley forearc basin. Subsequent forearc sedimentation accompanied the assembly of multiple belts of mélange and broken formation that form the Mesozoic-Cenozoic Franciscan subduction complex of the California Coast Ranges.Franciscan subduction was largely coeval with intrusion of the dominantly Cretaceous Sierra Nevada batholith into the roots of the Cordilleran magmatic arc, but Franciscan accretion was just a late phase of continuing tectonic expansion that spanned more than 200 m.y. along the California continental margin.

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“…[49] The presence of Permian macrofossils of McCloud belt affinity at several localities on the Slide Mountain and Yukon-Tanana terranes (see summary by , together with paleomagnetic results suggesting ∼2000 km of northward displacement of PennsylvanianPermian rocks of the Slide Mountain assemblage in the Sylvester allochthon [Richards et al, 1993], has led some workers to speculate that the Slide Mountain ocean must have been several thousand kilometers wide [e.g., Stevens et al, 1990;Nelson et al, , 2009. Our dating results help constrain the possible size and tectonic evolution of the Slide Mountain ocean basin.…”

Section: Implications For the Size And Evolution Of The Slide Mountaimentioning

confidence: 99%

The timing and provenance record of the Late Permian Klondike orogeny in northwestern Canada and arc‐continent collision along western North America

Beranek¹,

2011

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The northern Canadian Cordillera exhibits coeval accreted arc, subduction zone, ocean basin, and continental margin assemblages that make the region an exceptional place to understand tectonic processes involved in arc‐continent collision. In this study, we use U‐Pb zircon and monazite geochronology to define the timing and provenance record of Late Permian collisional orogeny related to the accretion of the Yukon‐Tanana terrane onto the ancestral North American continental margin of northwestern Canada. New U‐Pb crystallization ages of Permian intrusive rocks in the Klondike District of western Yukon bracket the timing of collision‐related ductile deformation and greenschist‐ to amphibolite‐facies metamorphism on the Yukon‐Tanana terrane between 260 and 252.5 Ma. This tectonothermal event is herein named the Klondike orogeny. Detrital zircon U‐Pb geochronology of Triassic strata provides the sedimentary record of arc‐continent collision and crustal reworking along the Cordilleran margin. Arc‐derived detrital zircons in Early to Middle Triassic (251–235 Ma) strata overlying the ancestral North American continental margin in Yukon suggest that a foreland‐style basin developed adjacent to the Klondike orogen. Regionally extensive Late Triassic (235–200 Ma) strata containing primarily North American detrital zircons form an overlap assemblage that covered the accreted terranes and western North America. The timing of the Klondike orogeny is roughly synchronous with other contractional events along the ∼5000 km strike length of the Cordillera, including the Late Permian‐Early Triassic Sonoman orogeny in Nevada. Global plate reorganization linked to assembly of Pangaea may have been the tectonic engine for late Paleozoic‐early Mesozoic development of the North American Cordillera.

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Significance of the provincial signature of Early Permian faunas of the eastern Klamath terrane

Cited by 34 publications

References 13 publications

Tectonic implications of detrital zircon data from Paleozoic and Triassic strata in western Nevada and Northern California

Tectonic implications of detrital zircon data from Paleozoic and Triassic strata in western Nevada and Northern California

Accretionary Mesozoic–Cenozoic expansion of the Cordilleran continental margin in California and adjacent Oregon

The timing and provenance record of the Late Permian Klondike orogeny in northwestern Canada and arc‐continent collision along western North America

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