Late Cretaceous-early Cenozoic tectonic evolution of the southern California margin inferred from provenance of trench and forearc sediments

Provenance of a large Lower Cretaceous turbidite submarine fan complex on the active Laurasian margin: Central Pontides, northern Turkey

“…Detrital zircon ages are widely used for provenance analysis to constrain paleogeography, tectonic reconstructions, and crustal evolution (e.g., Gehrels et al, 1995;Fedo et al, 2003;Okay N. et al, 2010;Jacobson et al, 2011;Meinhold et al, 2013). In this study we have used detrital zircon ages from 13 sandstone samples from the Lower Cretaceous sequence of the Central Pontides.…”

Provenance of Pleistocene Rhine River Middle Terrace sands between the Swiss–German border and Cologne based on U–Pb detrital zircon ages

“…Relatively short lag times on the order of a few million years to a few tens of millions of years seem to be typical also of strike-slip, collisional and subduction-related ancient, and modern settings where detritus may be transferred rapidly from source to sink (e.g., Augustsson et al 2006;Bahlburg et al 2011;Link et al 2005;Rino et al 2008;Jacobson et al 2011).…”

First 40Ar-39Ar Ages from Low-T Mafic Blueschist Blocks in a Franciscan Mélange near San Simeon: Implications for Initiation of Subduction

“…On the basis of Cenozoic tectonic-plate reconstructions, similar blueschist-facies conditions must have developed soon after the initiation of subduction along the California margin over a distance of more than 1000 km. We recognize that Dickinson (1983) and Jacobson et al (2011) proposed a reconstruction that invokes hundreds of kilometers of sinistral strike-slip along the Nacimiento Fault during Cretaceous subduction. If this were the case, the San Simeon area would probably have been closer to its present location in Central California.…”

“…Dated material abbreviations are as follows: A, actinolite; B, biotite; F, feldspar; G, glaucophane; Gr, garnet; H, hornblende; L, lawsonite; M, white mica; Pl, plagioclase; R, whole rock; S, sphene. Map is after Jennings (1966), Cloos (1986), Shervais et al (2004), Ernst et al (2009), Wakabayashi andDumitru (2007), and Jacobson et al (2011). The following sources are referenced (see inset labeled "Sources"): Lee et al (1964), Suppe (1969), Firsov and Dobretsov (1970), Coleman and Lanphere (1971), Suppe and Armstrong (1972), Lanphere et al (1978), Mattinson andEcheverria (1980), McDowell et al (1984), Mattinson (1986), Ross and Sharp (1988), Grove and Bebout (1995), Catlos and Sorensen (2003), Grove et al (2003Grove et al ( , 2008, Anczkiewicz et al (2004), Wakabayashi and Dumitru (2007), and Mulcahy et al (2009). geochronological results for mafic blueschists from the Nacimiento Block (Ernst 1980;Page 1981), located to the west of the San Andreas Fault ( fig.…”

“…Ukar (2012) proposed a model in which extensional exhumation of Franciscan Eastern Belt coherent terranes, as well as the upwelling of subducted sediment to create shale-matrix mé lange, were facilitated, if not triggered, by the shallowing of the plate dip beginning around 80 Ma that caused the Laramide Orogeny (Coney and Reynolds 1977). This episode of flat-slab subduction probably also facilitated the creation of the POR schists between 70 and 30 Ma farther inland and directly beneath the plutonic roots of the arc (Jacobson et al 2011).…”