Tectonic interpretation of a geologic section of the continental margin off San Luis Obispo, the Southern Coast Ranges, and the San Joaquin Valley, California: Cross-section summary

Superimposed extension and shortening in the southern Salinas Basin and La Panza Range, California: A guide to Neogene deformation in the Salinian block of the central California Coast Ranges

“…Tertiary, or both) and nature of slip (thrust vs. strike slip) on the Nacimiento fault, but it is clearly pre-Miocene (Dickinson, 1983;Vedder et al, 1991;Ducea et al, 2009;Jacobson et al, 2011). In the area of Figure 2, the Nacimiento fault is offset or reactivated by the right-lateral Rinconada fault (Dibblee, 1976;Page et al, 1979), which now forms the principal boundary between Salinian and Franciscan basement in our study area. Estimates of post-Oligocene right-lateral slip on the Rinconada fault range from 60 km (Dibblee, 1976) to ~45 km (Graham, 1978;Grove, 1993).…”

“…The Salinian block consists of Cretaceous granitic and metamorphic rocks (and their Cretaceous to Early Tertiary sedimentary cover) that were part of the Mesozoic batholith in southern California prior to northward displacement along the San Andreas fault (e.g., Page et al, 1979;Dickinson, 1983;Jacobson et al, 2011). Southwest of the Nacimiento fault ( Fig.…”

Heat advection by groundwater flow through a heterogeneous permeability crust: A potential cause of scatter in surface heat flow near Parkfield, California

“…We use existing geologic maps, well data, and interpretations of subsurface geology from geophysical studies to define a composite geologic cross section for the Parkfield region that encompasses the key hydrostratigraphic units [ Jennings et al , 1977; Mansfield , 1979; Page et al , 1979; Sims , 1988, 1990; Bartow , 1990; Griscom and Jachens , 1990; Boness and Zoback , 2004, 2006; McPhee et al , 2004; Hole et al , 2006; Guzofski et al , 2007; Becken et al , 2008] (Figure 3). The contacts between the major geologic units along this profile are representative of their positions in the study area [e.g., Jennings et al , 1977].…”

“…The Parkfield region is characterized by 1–3 km of moderately to well‐consolidated Tertiary sedimentary rock (herein referred to as “Tertiary sediments”) overlying plutonic, metamorphic and sedimentary basement [e.g., Jennings et al , 1977; Sims , 1988, 1990; Bartow , 1990; Griscom and Jachens , 1990; McPhee et al , 2004; Hole et al , 2006]. The northwest‐southeast striking SAF juxtaposes the allochthonous granitic Salinian block to the southwest and the Franciscan Assemblage to the northeast [e.g., Dickinson , 1966; Jennings et al , 1977; Page et al , 1979]. The Franciscan Assemblage is a tectonic mélange [e.g., Dickinson , 1966] representing an accretionary prism associated with Mesozoic subduction off the west coast of present‐day North America [e.g., Dickinson , 1966; Page et al , 1979].…”

“…The northwest‐southeast striking SAF juxtaposes the allochthonous granitic Salinian block to the southwest and the Franciscan Assemblage to the northeast [e.g., Dickinson , 1966; Jennings et al , 1977; Page et al , 1979]. The Franciscan Assemblage is a tectonic mélange [e.g., Dickinson , 1966] representing an accretionary prism associated with Mesozoic subduction off the west coast of present‐day North America [e.g., Dickinson , 1966; Page et al , 1979]. The Waltham Canyon Fault, and other faults associated with the Coast Range Thrust, mark the boundary between the Franciscan Assemblage and the Great Valley Sequence to the northeast [e.g., Jennings et al , 1977; Jayko et al , 1987] (Figure 3), a thick package of marine clastics sourced from the Sierran‐Klamath belt and representing a large Mesozoic fore‐arc basin [e.g., Dickinson , 1966; Dickinson and Rich , 1972; McLean , 1981].…”