Paleotectonics of a complex Miocene half graben formed above a detachment fault: The Diligencia basin, Orocopia Mountains, southern California

Ingersoll, Raymond V.; Pratt, Mark J.; Davis, Paul M.; Caracciolo, Luca; Day, Paul Patrick; Hayne, P. O.; Petrizzo, Daniel A.; Gingrich, David A.; Cavazza, William; Critelli, Salvatore; Diamond, David S.; Coffey, Kevin T.; Stang, Dallon M.; Hoyt, Johanna F.; Reith, R. C.; Hendrix, Eric D.

doi:10.1130/l334.1

Cited by 8 publications

(18 citation statements)

References 61 publications

(124 reference statements)

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“…Our findings support reconstructions of the San Gabriel/Canton and San Andreas faults that closely align crustal blocks of the Tejon, Soledad, and Orocopia regions (e.g., Hill and Dibblee, 1953;Crowell, 1962Crowell, , 1975aCarman, 1964;Ehlig and Ehlert, 1972;Bohannon, 1975;Ehlert, 1982Ehlert, , 2003Weigand, 1982;Frizzell and Weigand, 1993;Ingersoll et al, 2014;Hoyt et al, 2018). In particular, the presence of Oligocene-Miocene strata on both flanks of the Blue Ridge anticlinorium helps link the Soledad region, where strata south of the Sierra Pelona anticlinorium have been given greater emphasis (e.g., Crowell, 1975a;Hendrix and Ingersoll, 1987), with the Orocopia region, where Oligocene-Miocene strata are presently preserved only on the north side of its anticlinorium (e.g., Crowell, 1975b).…”

Section: San Gabriel/canton and San Andreas Faultssupporting

confidence: 74%

“…The Diligencia Formation occupies an analogous position north of the Orocopia Mountains anticlinorium in the Orocopia region, and thus may correlate with these basins as well ( Fig. 10B; Ingersoll et al, 2014).…”

Section: Vasquez Formationmentioning

confidence: 96%

“…Pelona Schist is also exposed in the core of an anticlinorium along Blue Ridge in the Punchbowl block (e.g., Dibblee, 1968), and in the core of anticlinoria in the Tejon and Soledad regions (e.g., Ehlig, 1968;Crowell, 1975a). The correlated Orocopia Schist is exposed in an anticlinorium in the Orocopia region (e.g., Crowell, 1962;Ehlig, 1968;Haxel and Dillon, 1978;Jacobson et al, 2007;Ingersoll et al, 2014).…”

Section: Potential Source Rocksmentioning

confidence: 99%

“…Correlation of the Tejon, Soledad, and Orocopia regions ( Fig. 1) has been proposed and refined based on similarities in both basement rocks, and sedimentary and volcanic strata (e.g., Hill and Dibblee, 1953;Crowell, 1962Crowell, , 1975aCarman, 1964;Ehlig and Ehlert, 1972;Bohannon, 1975;Ehlert, 1982Ehlert, , 2003Weigand, 1982;Frizzell and Weigand, 1993;Ingersoll et al, 2014;Hoyt et al, 2018). Such correlations imply 60-70 km and ~240 km of dextral slip along the Coffey et al | Stratigraphy, provenance, and tectonic significance of the Punchbowl block GEOSPHERE | Volume 15 | Number 2 San Gabriel/Canton and San Andreas faults, respectively (e.g., Crowell, 1975a;Ingersoll et al, 2014).…”

Section: Tectonic Reconstructions Of the Southern San Andreas Fault Smentioning

confidence: 99%

“…1) has been proposed and refined based on similarities in both basement rocks, and sedimentary and volcanic strata (e.g., Hill and Dibblee, 1953;Crowell, 1962Crowell, , 1975aCarman, 1964;Ehlig and Ehlert, 1972;Bohannon, 1975;Ehlert, 1982Ehlert, , 2003Weigand, 1982;Frizzell and Weigand, 1993;Ingersoll et al, 2014;Hoyt et al, 2018). Such correlations imply 60-70 km and ~240 km of dextral slip along the Coffey et al | Stratigraphy, provenance, and tectonic significance of the Punchbowl block GEOSPHERE | Volume 15 | Number 2 San Gabriel/Canton and San Andreas faults, respectively (e.g., Crowell, 1975a;Ingersoll et al, 2014). These correlations have been widely accepted, but also challenged by alternate reconstructions (e.g., Smith, 1977;Powell, 1981Spittler and Arthur, 1982;Frizzell et al, 1986;Matti and Morton, 1993;Weldon et al, 1993), most of which suggest that 80-110 km of dextral slip occurred along the San Francisquito-Fenner-Clemens Well fault, and only 42 km and 160-185 km occurred along the San Gabriel/Canton and southern San Andreas faults, respectively (e.g., .…”

Section: Tectonic Reconstructions Of the Southern San Andreas Fault Smentioning

confidence: 99%

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Stratigraphy, provenance, and tectonic significance of the Punchbowl block, San Gabriel Mountains, California, USA

2019

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The Punchbowl block is a fault-bounded crustal sliver in the eastern San Gabriel Mountains of southern California with important implications for conflicting reconstructions of the San Andreas fault system. Detailed mapping, determination of conglomerate-clast and sandstone compositions, and dating of detrital and igneous zircon of Oligocene-Miocene strata define two distinct subbasins and document initiation of extension and volcanism ca. 25-24 Ma, followed by local exhumation of the Pelona Schist, and transition from alluvial-fan to braided-fluvial deposition. Strata of the Punchbowl block correlate with those of other regions in southern California, confirming 40-50 km of dextral slip on the Punchbowl fault, and supporting reconstructions with 60-70 km of dextral slip on the San Gabriel/ Canton fault and ~240 km of dextral slip on the southern San Andreas fault. Provenance and probable correlations of Punchbowl-block strata argue against 80-110 km of dextral slip on the San Francisquito-Fenner-Clemens Well fault and limit the time interval during which such slip could have occurred. Synthesis of these findings with previous work produces paleogeographic reconstructions of the Punchbowl block and its probable correlatives through time.

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