Implications of upper Mesozoic conglomerate for suspect terrane in western California and adjacent areas

Salinia revisited: a crystalline nappe sequence lying above the Nacimiento fault and dispersed along the San Andreas fault system, central California

“…Gilbert 1971Gilbert , 1973Page 1981Page , 1982Dickinson 1983;Hall , 2002Hall et al 1995;Dickinson et al 2005;Ducea et al 2009;Jacobson et al 2011). Four interpretations of the nature of the boundary discussed in numbered topics below are: (i) dextral slip of (a) 2100-2500 km (1305-1554 mi) or more (Champion et al 1984) along unnamed faults or (b) 90 km (56 mi) or more of dextral slip on the Nacimiento fault (Vedder et al 1991, p. 951); (ii) sinistral strike slip of 500-600 km (311-373 mi) on the Nacimiento fault (Dickinson 1983;Seiders and Blome 1988;Dickinson et al 2005;Jacobson et al 2011, figure 10); (iii) thrusting along the K-T Nacimiento fault (Page 1967(Page , 1969(Page , 1970a(Page , 1970b(Page , 1972(Page , 1982Silver 1982Silver , 1983Page and Brocher 1993;Hall et al 1995;Barth and Schneiderman 1996;Saleeby 1997Saleeby , 2003Yin 2002;Barth et al 2003;Kidder and Ducea 2006;Ducea et al 2009;Namson and Davis 2012); and (iv) as a corollary to (iii) above, the Nacimiento fault was a low-angle subduction megathrust surface along which the Sur-Obispo Franciscan belt was subducted, and then partially extruded back out along which promoted the observed upper plate (Salinia) extension and subsidence to marine conditions in Maastrichtian time (after Grove 1993).…”

Composition of conglomerates analyzed by the Curiosity rover: Implications for Gale Crater crust and sediment sources

“…Among sedimentary rocks, conglomerates are those which are the least altered and provide the most direct knowledge of the source of sediments [e.g., Seiders and Blome , ; Cox and Lowe , ]. Preserved clasts enable a direct look at the texture and composition of the source rock.…”

“…These conglomerates occur as local outcrops on a hummocky plain that has a surface mainly covered by a residual lag composed of clasts and sand. Then, the rover entered into a region named Yellowknife Bay where exposed sedimentary rocks (mudstones and sandstones) were interpreted as fluvial and lacustrine deposits Among sedimentary rocks, conglomerates are those which are the least altered and provide the most direct knowledge of the source of sediments [e.g., Seiders and Blome, 1988;Cox and Lowe, 1995]. Preserved clasts enable a direct look at the texture and composition of the source rock.…”

Post-1968 research on the Great Valley Group

“…1). Additional work by Bertucci (1983), Seiders (1983Seiders ( , 1989, Suchecki (1984), Seiders and Blome (1988), and Short and Ingersoll (1990) refined provenance interpretations through combined study of sandstone and conglomerate petrofacies. Additional detailed insight regarding evolution of the Sierra Nevada magmatic arc was provided by analysis of radiogenic isotopes of Great Valley petrofacies (Linn et al, 1991(Linn et al, , 1992.…”