Petrogenesis of the Barcroft pluton, northern White-Inyo Mountains, east-central California

Ernst, W. G.

doi:10.1007/s00410-012-0815-8

Cited by 2 publications

(1 citation statement)

References 56 publications

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“…However, the timing and volume of melt input had to keep the temperatures of intrusion quite high, because there are no sharp boundaries and distinguishing separate pulses in the field is not possible. Similar mechanisms were described for the Spirit Mountain Batholith (Walker et al 2007), intrusion from the Henry Mountains, Utah (Horsman et al 2010) and the Barcroft pluton, California (Ernst 2013).…”

Section: (B) (A)mentioning

confidence: 85%

Multiphase magmatic activity in the Variscan Kłodzko–Złoty Stok intrusion, Polish Sudetes: evidence from SHRIMP U–Pb zircon ages

Jokubauskas¹,

Bagiński²,

Macdonald³

et al. 2017

Int J Earth Sci (Geol Rundsch)

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The Kłodzko-Złoty Stok intrusion (KZSI), located in the NE part of the Bohemian Massif of Central Europe, has preserved records of the magmatic and tectonic activity of the Variscan orogeny in the Sudetes. KZSI is extraordinarily complex texturally, and shows a very wide range of chemical, isotopic and mineralogical compositions which indicates a complex, multiphase history of intrusion. New SHRIMP U-Pb zircon ages provide evidence of two magmatic episodes with a distinctive hiatus between them at ~ 326-308 Ma. The youngest dated zircons (303.8 ± 3.8/4.2 Ma) are from the Laski leucocratic hornblende-biotite monzogranite and mark a short interval of post-collisional reactivation of the magma system. Zircons from a biotite-hornblende diorite sheet from the northern part of KZSI yielded an age of 349 ± 3.4/3.7 Ma, interpreted as indicating the initial phase of an early Carboniferous, multi-pulse episode. The evolution of the magmatic system can be tied to a 334.4 ± 2.9/3.3 Ma zircon age for melanocratic syenites from Podzamek which represent lamprophyric melt. Based on textural and compositional data and field relationships we interpret the intrusion as having been tilted post-emplacement towards the NW. This, together with the new dating results, ties the early Carboniferous episode of KZSI activity and the Jawornik granitoids (5 km to the SE) to the same magmatic system and arguably to bentonites of the Paprotnia beds (5 km to the NW), all representing different levels of such a system. The newly estimated late Carboniferous age from Laski ties part of the KZSI to other late Carboniferous Sudetic intrusions and late Carboniferous-Permian volcanism.

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Section: (B) (A)mentioning

confidence: 85%

Multiphase magmatic activity in the Variscan Kłodzko–Złoty Stok intrusion, Polish Sudetes: evidence from SHRIMP U–Pb zircon ages

Jokubauskas¹,

Bagiński²,

Macdonald³

et al. 2017

Int J Earth Sci (Geol Rundsch)

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Detrital zircon geochronology of Neoproterozoic–Lower Cambrian passive-margin strata of the White-Inyo Range, east-central California: Implications for the Mojave–Snow Lake fault hypothesis

Chapman

Ernst

Gottlieb

et al. 2015

Geological Society of America Bulletin

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Correlation of lithotectonic packages across major transcurrent structures is critical to understanding the tectonic evolution of the North American continental margin.Detrital zircon geochronology of uppermost Proterozoic to Lower Paleozoic mio geo clinal strata from the White-Inyo Mountains permits evaluation of: (1) the age and provenance of these metasediments and (2) a model for truncation of the passive margin along a postulated large-magnitude Cretaceous dextral shear zone, i.e., the Mojave-Snow Lake fault. U-Pb ages of detrital zircons from the Neoproterozoic Wyman Formation, the upper most Proterozoic Reed Dolomite (Hines Tongue Member), and clastic strata of the Lower Cambrian Deep Springs, Campito (Montenegro Member), Poleta, and Harkless formations refl ect ultimate derivation from the adjacent 1.7-pre-1.8 Ga Mojavia terrane and/or 1.7-1.8 Ga Yavapai continental basement, with subsidiary sources in both the ca. 1.4 Ga Yavapai-Mazatzal anorogenic granitoids and the >2.5 Ga North American craton, and a small proportion of 1.0-1.3 Ga grains, most likely reworked from Grenville clastic wedge deposits. Detrital zircon age spectra from the Lower Cambrian Andrews Mountain Member of the Campito Formation are unique in comparison with the remainder of the studied section, containing a major age peak centered at ca. 1.1 Ga and a subsidiary Lower Cambrian age peak, permitting calculation of a ca. 527 ± 12 (2σ) Ma maximum depositional age. These features, in addition to abundant detrital magnetite-ilmenite grains, refl ect a distal source for these rocks, most likely from the ca. 1.1 Ga Pikes Peak batholith and/or the Midcontinent rift and ca. 0.53 Ga bimodal intrusions of the Oklahoma-Colorado aulacogen. In terms of zircon age distribution, allochthonous metamorphic pendants in the Snow Lake terrane of the central Sierra Nevada batholith are most similar to those of stratigraphically equivalent units in the Death Valley region and, to lesser degrees, the White-Inyo section, and the Mojave Desert region. Given the similarity and relative proximity of Death Valley facies assemblages to the Snow Lake terrane, we suggest that the latter was not transported northward from the Mojave Desert region and instead represents footwall assemblages of a late Early to early Middle Jurassic lowangle normal fault system, probably along the outer transform-truncated margin of the Last Chance thrust stack. This model implies a few tens of kilometers of offset, in contrast to the hundreds of kilometers required by the Mojave-Snow Lake fault hypothesis.

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Petrogenesis of the Barcroft pluton, northern White-Inyo Mountains, east-central California

Cited by 2 publications

References 56 publications

Multiphase magmatic activity in the Variscan Kłodzko–Złoty Stok intrusion, Polish Sudetes: evidence from SHRIMP U–Pb zircon ages

Multiphase magmatic activity in the Variscan Kłodzko–Złoty Stok intrusion, Polish Sudetes: evidence from SHRIMP U–Pb zircon ages

Detrital zircon geochronology of Neoproterozoic–Lower Cambrian passive-margin strata of the White-Inyo Range, east-central California: Implications for the Mojave–Snow Lake fault hypothesis

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