Paleogeographic significance of Ediacaran cyclomedusoids within the Antelope Mountain Quartzite, Yreka subterrane, eastern Klamath Mountains, California

Lindsley‐Griffin, Nancy; Griffin, John; Farmer, Jack D.

doi:10.1130/2008.442(01)

Cited by 8 publications

(7 citation statements)

References 73 publications

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“…8B, 8C). These detrital zircon ages support local provenance from rock units in the Klamath Mountains (Yreka and Trinity subterranes), including 435-400 Ma plutonic rocks, Devonian volcanic and volcaniclastic rocks, and cratonal strata that were metamorphosed to blueschist facies (e.g., Wallin et al, 1995;Wallin and Metcalf, 1998;Grove et al, 2008;Lindsley-Griffin et al, 2008). Metasedimentary rock units of the Northern Sierra terrane in northern California (Sierra City mélange, Shoo Fly Complex) that are intruded by the 372 ± 6 Ma Bowman Lake batholith (Cecil et al, 2012) have detrital zircon age distributions similar to those of Eastern Klamath terrane strata (Figs.…”

Section: Potential Sources From the Western Laurentian Marginsupporting

confidence: 64%

Detrital zircon record of mid-Paleozoic convergent margin activity in the northern U.S. Rocky Mountains: Implications for the Antler orogeny and early evolution of the North American Cordillera

2016

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The passive to convergent margin transition along western Laurentia drove early development of the North American Cordillera and culminated with the Late Devonian-Mississippian Antler orogeny and emplacement of the Roberts Mountain allochthon in the western United States. New detrital zircon studies in the Pioneer Mountains, east-central Idaho, were conducted to investigate the stratigraphic evidence of this transition and test models for mid-Paleozoic tectonics and paleogeography. Ordovician to Lower Devonian passive margin strata of the Roberts Mountain allochthon and adjacent North American parautochthon contain ca. 1850, 1920, 2080, and 2700 Ma detrital zircons that indicate provenance from the Peace River Arch region of northwestern Laurentia. These detrital zircons are much older than the depositional ages of their host rocks and probably record long-term sediment recycling processes along the Cordilleran margin. Upper Devonian strata, including Frasnian turbidites of the Roberts Mountain allochthon, document the incursion of 450-430 Ma and 1650-930 Ma detrital zircons from an unknown source to the west. Detrital zircon Hf isotope results suggest that the western source was an early Paleozoic arc built on Proterozoic crust, with the Eastern Klamath, Northern Sierra, and Quesnellia terranes as likely candidates. Lower Mississippian syntectonic strata filled a rapidly subsiding, releasing bend basin that was associated with sinistral-oblique plate convergence and reworking of lower Paleozoic rocks in east-central Idaho. The available detrital zircon and stratigraphic data are most consistent with noncollisional models for the Antler orogeny, including scenarios that feature the north to south, time-transgressive juxtaposition of Baltican-and Caledonian-affinity terranes along the Cordilleran margin.

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Section: Potential Sources From the Western Laurentian Marginsupporting

confidence: 64%

Detrital zircon record of mid-Paleozoic convergent margin activity in the northern U.S. Rocky Mountains: Implications for the Antler orogeny and early evolution of the North American Cordillera

2016

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“…This interpretation is consistent with the presence of closely similar faunal assemblages in limestone blocks (Potter et al, 1990), similarities in detrital zircon populations in sandstone blocks, and tonalite blocks with Ediacaran zircon ages in both the Sierra City mélange and the Yreka terrane (Grove et al, 2008). Ediacaran tonalites also occur in the Trinity terrane (Wallin et al, 1988;Lindsley-Griffin et al, 2008). Possibly, parts of these older convergent margin assemblages were tectonically juxtaposed with the developing Late Devonian subduction complex in the Northern Sierra terrane and were incorporated into the younger subduction zone.…”

Section: Broader Tectonic Implicationssupporting

confidence: 77%

“…Possibly, parts of these older convergent margin assemblages were tectonically juxtaposed with the developing Late Devonian subduction complex in the Northern Sierra terrane and were incorporated into the younger subduction zone. Ordovician to Early Devonian zircons found in two sandstone blocks in the Sierra City mélange (Grove et al, 2008; this paper) also could have been derived from parts of the Yreka and Trinity terranes and the Lower to Middle Devonian arc sequence in the Redding section in the eastern Klamath Mountains, which contain detrital zircons or record igneous activity in the same time frame (Dickinson, 2000;Grove et al, 2008;Lindsley-Griffin et al, 2008). However, the starved-basin hemipelagic Upper Mississippian-Upper Pennsylvanian deposits of the upper Peale Formation in the Northern Sierra terrane show little similarity with age-equivalent strata in the Redding section, which record Late Devonian(?)…”

Section: Broader Tectonic Implicationsmentioning

confidence: 88%

“…Permian arc rocks and associated strata in the Alexander, Yukon-Tanana, Stikinia, Quesnellia, Chilliwack, and Northern Sierra terranes contain the distinctive McCloud fauna (Miller, 1987). The same fauna also occurs in Permian strata in the eastern Klamath Mountains, which make up part of a succession of Lower Devonian and younger, partly arc-related strata (Redding section) that largely postdate formation of the Yreka and Trinity terranes (Dickinson, 2000;Lindsley-Griffin et al, 2008). The McCloud fauna is considered to have evolved on the order of 2000-3000 km away from the Laurentian margin and generally at more southerly latitudes than the present positions of the terranes containing the fauna (Belasky et al, 2002;Stevens and Belasky, 2009).…”

Section: ■ Regional Tectonic Frameworkmentioning

confidence: 99%

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Nature and timing of Late Devonian–early Mississippian island-arc magmatism in the Northern Sierra terrane and implications for regional Paleozoic plate tectonics

et al. 2019

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The Northern Sierra terrane is one of a series of Paleozoic terranes outboard of the western Laurentian margin that contain lithotectonic elements generally considered to have originated in settings far removed from their present relative locations. The Lower to Middle Paleozoic Shoo Fly Complex makes up the oldest rocks in the terrane and consists partly of thrust-imbricated deep-marine sedimentary strata having detrital zircon age signatures consistent with derivation from the northwestern Laurentian margin. The thrust package is structurally overlain by the Sierra City mélange, which formed within a mid-Paleozoic subduction zone and contains tectonic blocks of Ediacaran tonalite and sandstone with Proterozoic to early Paleozoic detrital zircon populations having age spectra pointing to a non–western Laurentian source. Island-arc volcanic rocks of the Upper Devonian Sierra Buttes Formation unconformably overlie the Shoo Fly Complex and are spatially associated with the Bowman Lake batholith, Wolf Creek granite stock, and smaller hypabyssal felsic bodies that intrude the Shoo Fly Complex. Here, we report new results from U-Pb sensitive high-resolution ion microprobe–reverse geometry (SHRIMP-RG) dating of 15 samples of the volcanic and intrusive rocks, along with geochemical studies of the dated units. In addition, we report U-Pb laser ablation–inductively coupled plasma–mass spectrometry ages for 50 detrital zircons from a feldspathic sandstone block in the Sierra City mélange, which yielded abundant Ordovician to Early Devonian (ca. 480–390 Ma) ages. Ten samples from the composite Bowman Lake batholith, which cuts some of the main thrusts in the Shoo Fly Complex, yielded an age range of 371 ± 9 Ma to 353 ± 3 Ma; felsic tuff in the Sierra Buttes Formation yielded an age of 363 ± 7 Ma; and three felsic hypabyssal bodies intruded into the Sierra City mélange yielded ages of 369 ± 4 Ma to 358 ± 3 Ma. These data provide a younger age limit for assembly of the Shoo Fly Complex and indicate that arc magmatism in the Northern Sierra terrane began with a major pulse of Late Devonian (Famennian) igneous activity. The Wolf Creek stock yielded an age of 352 ± 3 Ma, showing that the felsic magmatism extended into the early Mississippian. All of these rocks have similar geochemical features with arc-type trace-element signatures, consistent with the interpretation that they constitute a petrogenetically linked volcano-plutonic system. Field evidence shows that the felsic hypabyssal intrusions in the Sierra City mélange were intruded while parts of it were still unlithified, indicating that a relatively narrow time span separated subduction-related deformation in the Shoo Fly Complex and onset of Late Devonian arc magmatism. Following recent models for Paleozoic terrane assembly in the western Cordillera, we infer that the Shoo Fly Complex together with strata in the Roberts Mountains allochthon in Nevada migrated south along a sinistral transform boundary prior to the onset of arc magmatism in the Northern Sierra terrane. We suggest that the Shoo Fly Complex arrived close to the western Laurentian margin at the same time as the Roberts Mountains allochthon was thrust over the passive margin during the Late Devonian–early Mississippian Antler orogeny. This led to a change in plate kinematics that caused development of a west-facing Late Devonian island arc on the Shoo Fly Complex. Due to slab rollback, the arc front migrated onto parts of the Sierra City mélange that had only recently been incorporated into the accretionary complex. In the mélange, blocks of Ediacaran tonalite, as well as sandstones having detrital zircon populations with non–western Laurentian sources, may have been derived from the Yreka and Trinity terranes in the eastern Klamath Mountains, where similar rock types occur. If so, this suggests that these Klamath terranes were in close proximity to the developing accretionary complex in the Northern Sierra terrane in the Late Devonian.

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“…Four nearby occurrences of poorly-consolidated volcanicrich conglomerate have been correlated with the Pythian Cave conglomerate, but may be reworked Tertiary terrace gravels , and are not included in this study. The Pythian Cave conglomerate rests on Late Proterozoic and Early Devonian age rocks of the Yreka subterrane of the Eastern Klamath terrane (Lindsley-Griffin et al, 2008). However, the abundance of basaltic and andesitic volcanic clasts in the Pythian Cave conglomerate appears to be exotic to the Klamath Mountains and differs from the primarily metamorphic clasts in the basal Hornbrook Formation that are largely derived from the Klamath Mountains (Barats et al, 1984).…”

Section: The Pythian Cave Conglomeratementioning

confidence: 99%

Provenance of the Pythian Cave conglomerate, northern California: implications for mid-Cretaceous paleogeography of the U.S. Cordillera

Surpless¹,

Augsburger²

2009

Cretaceous Research

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Paleogeographic significance of Ediacaran cyclomedusoids within the Antelope Mountain Quartzite, Yreka subterrane, eastern Klamath Mountains, California

Cited by 8 publications

References 73 publications

Detrital zircon record of mid-Paleozoic convergent margin activity in the northern U.S. Rocky Mountains: Implications for the Antler orogeny and early evolution of the North American Cordillera

Detrital zircon record of mid-Paleozoic convergent margin activity in the northern U.S. Rocky Mountains: Implications for the Antler orogeny and early evolution of the North American Cordillera

Nature and timing of Late Devonian–early Mississippian island-arc magmatism in the Northern Sierra terrane and implications for regional Paleozoic plate tectonics

Provenance of the Pythian Cave conglomerate, northern California: implications for mid-Cretaceous paleogeography of the U.S. Cordillera

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