High-resolution tephrochronology of the Wilson Creek Formation (Mono Lake, California) and Laschamp event using 238U-230Th SIMS dating of accessory mineral rims

Millennial-scale phase relationships between ice-core and Mediterranean marine records: insights from high-precision 40Ar/39Ar dating of the Green Tuff of Pantelleria, Sicily Strait

“…Absolute temporal tie-points that are independent of tuning strategies or phasing assumptions are critical in this regard, particularly for recent marine records extending beyond the radiocarbon timescale. Together with emerging high-resolution U-Th chronologies from speleothems, corals, and tephras (Genty et al, 2010;Thompson and Goldstein, 2006;Vazquez and Lidzbarski, 2012), 40 Ar/ 39 Ar ages from large-scale volcanic events recorded onland and off-shore are bound to play an increasing role in upcoming phase-tuning strategies of Late Quaternary paleoclimate records.…”

“…70 ka (Svensson et al, 2008;Austin and Hibbert, 2012), marine and continental paleoclimate studies have now matured into a discipline where high-quality age control is essential for putting on an equal pace layer-counted timescale models and Late Quaternary sedimentary records. While high-resolution U-Th and 40 Ar/ 39 Ar dating of globally recorded geomagnetic excursions (e.g., the Laschamp event) and speleothem records has consideraby improved the absolute time calibration of Quaternary archives (e.g., Singer et al, 2009;Genty et al, 2010;Vazquez and Lidzbarski, 2012), tie-points with near-millennial absolute age control remain crudely scarce for paleoclimatic time-series extending beyond the radiocarbon timescale, especially in the marine record.…”

Sixth International Limnogeology Congress: field trip guidebook, Reno, Nevada, June 15-19, 2015

“…They are presumed to be the source of the Wilson Creek Formation tephras, whose glass majorelement chemistry is indistinguishable from that of the craters. Recent work by Vazquez and others (2013) and Marcaida and others (2014) has begun to connect WCF tephras with specific eruptions of the Mono Craters based on their titanomagnetite geochemistry, supported by U-Th dating of allanite and zircons (Vazquez and Lidzbarski, 2012;Vazquez and others, 2013). A puzzle that remains to be solved is the apparent imbalance between the age of the tephras, which range from about 17 to about 65 ka, and the apparent age of the craters, mostly younger than 20 ka, and none so far found to be older than 25 ka.…”

“…B. Cartoon of stratigraphy by Lajoie (1968) with U/Th allanite ages of Vazquez and Lidzbarski (2012), except Ash 2, unpublished age estimate of Wang and others (2012). C. Lake-level curve indicated by stratigraphic relationships of WCF exposures around the Mono basin, after Lajoie (1968).…”

The link between volcanism and plutonism in epizonal magma systems; high-precision U–Pb zircon geochronology from the Organ Mountains caldera and batholith, New Mexico

“…1) (Seager and McCurry 1988;Vazquez and Lidzbarski 2012;Verplanck et al 1995). Zircons from a sample from the middle exposure of the AFG yielded a single population of 206 Pb/ 238 U dates with a weighted mean of 36.259 ± 0.021 Ma (sample Tmoe, MSWD = 0.4, n = 5/5).…”