Student Participation in an Offshore Seismic-Reflection Study of the Palos Verdes Fault, California Continental Borderland

Francis, Robert D.; Sigurdson, David Rhys; Legg, Mark R.; Grannell, R.B.; Ambos, Elizabeth L.

doi:10.5408/1089-9995-47.1.23

Cited by 2 publications

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“…In other areas, such as the Palos Verdes Hills (Fig. 2), shallow 'keystone' grabens form by extension along the crest of the transpressional uplift (Woodring et al 1946;Francis et al 1999).…”

Section: Borderland Restraining Bend Morphologymentioning

confidence: 99%

Morphology, structure and evolution of California Continental Borderland restraining bends

Legg

Goldfinger

Kamerling

et al. 2007

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Exceptional examples of restraining and releasing bend structures along major strikeslip fault zones are found in the California continental Borderland. Erosion in the deep sea is diminished, thereby preserving the morphology of active oblique fault deformation. Long-lived deposition of turbidites and other marine sediments preserve a high-resolution geological record of fault zone deformation and regional tectonic evolution. Two large restraining bends with varied structural styles are compared to derive a typical morphology of Borderland restraining bends. A 60-km-long, 158 left bend in the dextral San Clemente Fault creates two primary deformation zones. The southeastern uplift involves 'soft' turbidite sediments and is expressed as a broad asymmetrical ridge with right-stepping en echelon anticlines and local pull-apart basins at minor releasing stepovers along the fault. The northwest uplift involves more rigid sedimentary and possibly igneous or metamorphic basement rocks creating a steep-sided, narrow and more symmetrical pop-up. The restraining bend terminates in a releasing stepover basin at the NW end, but curves gently into a transtensional releasing bend to the SE. Seismic stratigraphy indicates that the uplift and transpression along this bend occurred within Quaternary times. The 80-kmlong, 30-408 left

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Section: Borderland Restraining Bend Morphologymentioning

confidence: 99%