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

Gehrels, George E.; Dickinson, William R.; Darby, Brian J.; Harding, J. Patrick; Manuszak, Jeffrey D.; Riley, Brook C. D.; Spurlin, Matthew S.; Finney, Stanley C.; Girty, Gary H.; Harwood, David S.; Miller, M. Meghan; Satterfield, Joseph I.; Smith, Moira; Snyder, W.S.; Wallin, E. Timothy; Wyld, Sandra J.

doi:10.1130/0-8137-2347-7.133

Cited by 26 publications

(22 citation statements)

References 43 publications

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“…The AMQ of the Yreka terrane was previously interpreted as part of the early Paleozoic system (Dickinson and Gehrels 2000;Gehrels et al 2000a) of northern California and northwesternmost Nevada, but new fossil data indicate that it is late Neoproterozoic (Vendian) in age (Lindsley-Griffin et al 2006). A poorly sorted quartz arenite from the AMQ has detrital modes indistinguishable from the those of the LDC allochthon (Dickinson and Gehrels 2000), but the AMQ sample collected for detrital zircon analysis was a texturally immature feldspathic granule conglomerate with a diverse zircon population.…”

Section: It Is Likely That the Upper Cambrian Harmonymentioning

confidence: 96%

Regional Detrital Zircon Provenance of Exotic Metasandstone Blocks, Eastern Hayfork Terrane, Western Paleozoic and Triassic Belt, Klamath Mountains, California

Scherer¹,

Ernst²,

Wooden³

2010

The Journal of Geology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to The Journal of Geology. A B S T R A C TThe addition of oceanic material through accretion-underplating was an important process in construction of the convergent/transpressive Cordilleran margin of North America. According to radiolarian ages, the Late Triassic or younger Eastern Hayfork terrane represents trench deposits that accreted outboard of the coeval North Fork immature island arc. It consists chiefly of chert and argillite but contains tectonic and olistostromal blocks of preexisting rock units derived from exotic sources that include inboard Klamath terranes. Fine-grained terrigenous debris was shed from these eastern terranes, but the Eastern Hayfork mé lange also contains blocks of quartzofeldspathic metasandstone of uncertain provenance. New detrital zircon U-Pb ages from five blocks of immature, variably metamorphosed, arkosic to subarkosic sandstone range from Late Proterozoic to Late Archean, with modes of ∼1804-1843, ∼1970, ∼2300, and ∼2550-2585 Ma. The adjacent, inboard North Fork terrane contains zircons with Phanerozoic ages, indicating derivation from eastern Klamath lithotectonic belts; however, no zircon grains with Phanerozoic ages were identified in the investigated Eastern Hayfork metasandstones. Petrographic analysis indicates that sand grains of the Eastern Hayfork blocks were initially derived from a transitional continental province whose textural immaturity precludes long sedimentary-transport distances. Thus, the metasandstone blocks were most likely tectonically incorporated into the oceanic mé lange from a local protolith and were not deposited in the trench as sand. Single-grain detrital zircon age spectra for the Eastern Hayfork metasandstone blocks are similar to those for several Cordilleran terranes, precluding clear discrimination among them regarding provenance. Although no currently exposed source is identical to the mé lange blocks, the Eastern Hayfork zircons show similarities to Laurentian passive-margin clastics in terms of Paleoproterozoic and Neoarchean ages. The presence of an outlier of the Antelope Mountain Quartzite of the Yreka terrane near the Eastern Hayfork terrane, however, indicates that this was a likely source of the exotic blocks. Evidently, this preexisting unit cropped out along the leading edge of the Cordilleran continental margin during Early Mesozoic mé lange formation, but its areal extent has been diminished by subsequent erosion, deposition, and/or deformation.

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Section: It Is Likely That the Upper Cambrian Harmonymentioning

confidence: 96%

Regional Detrital Zircon Provenance of Exotic Metasandstone Blocks, Eastern Hayfork Terrane, Western Paleozoic and Triassic Belt, Klamath Mountains, California

Scherer¹,

Ernst²,

Wooden³

2010

The Journal of Geology

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“…Other potential, more distant, sources for these age populations include wall rocks of the Peninsular Range Batholith (Morgan et al, 2005;Grove et al, 2008;Alsleben et al, 2011), basement rocks in Wyoming (Chamberlain et al, 2003), and Paleo zoic arc terranes and alloch thons of Nevada , northern California, and Oregon (Gehrels et al, 2000, and references therein).…”

Section: Minor Sourcesmentioning

confidence: 96%

Provenance of the Paleocene-Eocene Wilcox Group, western Gulf of Mexico basin: Evidence for integrated drainage of the southern Laramide Rocky Mountains and Cordilleran arc

Mackey¹,

Horton²,

Milliken³

2012

Geological Society of America Bulletin

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Laramide basement blocks of the U.S. Rocky Mountain Province have long been considered the sediment source of the Paleocene-Eocene Wilcox Group, implying that large-scale progradation driven by Laramide uplift induced a transition from carbonate to clastic deposition in the Gulf of Mexico. Detrital zircon U-Pb age spectra from 10 samples collected from the Wilcox Group in south Texas reveal a complex grain assemblage with major age populations at ca. 1800-1300 Ma and 350-50 Ma and minor populations at 1300-950 Ma, 3250-1850 Ma, and 900-400 Ma. Modal data for Wilcox Group sand grain populations from the same region suggest a diverse provenance, including sources from the Cordilleran magmatic arc and subordinate reworked sedimentary rocks. Sediment was primarily derived from a mix of crystalline basement blocks in the U.S. southern Rocky Mountains and northern Mexico, the Cordilleran arc of western Mexico and the southwestern United States, and Mesozoic-Paleogene magmatic rocks of northern Mexico. Secondary sources include recycled strata from Sevier-Laramide basins in the southwestern United States and northern Mexico. Comparisons of detrital zircon U-Pb age spectra show that the Lower Wilcox subunit contains signifi cant magmatic arc-derived sediment, whereas the Upper Wilcox subunit is more enriched in basement and recycled sedimentary detritus. Therefore, the relatively quartzose composition of the bulk detrital assemblages throughout the Wilcox Group of south Texas is not an accurate refl ection of the range of volcanic and basement sources indicated by the associated U-Pb ages, suggesting signifi cant attrition of unstable grains during long-distance (>500-1000 km) transport.

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“…The occurrence of off-shelf assemblages with similar age and Hf isotope characteristics cannot be explained by simple westward spilling of sediment into deeper-water settings because the off-shelf sandstones are less mature and coarser grained than their on-shelf counterparts (Ketner, 1968). Possible explanations include: (1) transport of sediment southward along the margin in deep-water settings, perhaps in a trench (Gehrels et al, , 2000b; (2) southward transport of the off-shelf assemblages by tectonic processes, e.g., sinistral transform faults (Wallin et al, 2000;Colpron and Nelson, 2009); (3) deri va tion from basement rocks exposed outboard of the Cordilleran margin (Ketner, 1968); and (4) derivation from regions other than western Laurentia, for example southeast Laurentia (Wright and Wyld, 2006).…”

Section: Ordovician Timementioning

confidence: 99%

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

Cited by 26 publications

References 43 publications

Regional Detrital Zircon Provenance of Exotic Metasandstone Blocks, Eastern Hayfork Terrane, Western Paleozoic and Triassic Belt, Klamath Mountains, California

Regional Detrital Zircon Provenance of Exotic Metasandstone Blocks, Eastern Hayfork Terrane, Western Paleozoic and Triassic Belt, Klamath Mountains, California

Provenance of the Paleocene-Eocene Wilcox Group, western Gulf of Mexico basin: Evidence for integrated drainage of the southern Laramide Rocky Mountains and Cordilleran arc

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