Late Quaternary alluviation and offset along the eastern Big Pine fault, southern California

DeLong, Stephen B.; Minor, Scott A.; Arnold, Lee J.

doi:10.1016/j.geomorph.2007.01.018

Cited by 8 publications

(8 citation statements)

References 17 publications

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“…45 ka, 25 ka, and ca. 3 ka (DeLong et al, 2007), which are coeval with strath terraces in both the Las Posas and Ojai Valleys and overlapping in age with relatively dry climate intervals (Fig. 11).…”

Section: Strath Terrace Formationmentioning

confidence: 94%

Climate-controlled landscape evolution in the Western Transverse Ranges, California: Insights from Quaternary geochronology of the Saugus Formation and strath terrace flights

et al. 2012

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The Las Posas and Ojai Valleys, located in the actively deforming Western Transverse Ranges of California, contain well-preserved fl ights of strath terraces and Quaternary strata (i.e., Saugus Formation) that when numerically dated elucidate the tectonic, geomorphic, and fl uvial histories that sculpted the landscape since ca. 140 ka. This study includes 14 new optically stimulated luminescence and 16 new terrestrial cosmogenic nuclide ages from the late Pleistocene to Holocene that record two regional aggradation events and four intervals of strath terrace formation. Geochronologic data indicate that terrestrial Saugus strata in the Las Posas Valley (Camarillo Member) prograded over marine deposits at ca. 125 and 80 ka and are as young as 60-25 ka, which is an order of magnitude younger than the youngest Saugus strata elsewhere in Southern California. These results highlight the need for precise dating of Saugus strata where identifi ed and utilized to assess rates of tectonic deformation. Based on its compositional character, thickness, stratigraphic relations, and inferred ages, the Camarillo member of the Saugus Formation is correlated with sediments of the Mugu aquifer identifi ed in subcrop throughout the Ventura Basin and thus provides a new regional chronostratigraphic subsurface datum. The aggradation of these sediments and similar deposits in the study area between 13 and 4 ka is subsequent to the transition from humid to semiarid climate correlating to the end of the ultimate and penultimate glacial maximums. Aggradation is inferred to have resulted from increased sediment supply in response transient vegetative conditions and consequent hillslope destabilization. Similar to aggradational events, strath terrace cover sediments ages correlate to dry warm climate intervals, indicating straths in Southern California were cut at ca. 110-100 ka, 50-35 ka, 26-20 ka, and 15-4 ka. These results support recent mathematical and experimental models of strath formation, where increased sediment fl ux and decreased water discharge enhances lateral erosion rates and inhibits vertical incision. Subsequent incision and strath terrace formation is inferred to occur during intervening wet climate intervals. The correlation of strath terrace ages and aggradational events with environmental changes that are linked to global climate indicates that climate rather than tectonics exhibits fi rst-order control of depositional, denudational, and incisional processes in the Western Transverse Ranges. Moreover, these results provide a chronostratigraphic framework that allows these landforms to be regionally correlated and used to assess rates of active tectonics where geochronologic data are unavailable.

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Section: Strath Terrace Formationmentioning

confidence: 94%

Climate-controlled landscape evolution in the Western Transverse Ranges, California: Insights from Quaternary geochronology of the Saugus Formation and strath terrace flights

et al. 2012

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“…OSL ages were used to confirm that the now displaced fluvial landforms were once the same terrace surface and to calculate dipslip rates on the fault. Modified from DeLong et al (2007).…”

mentioning

confidence: 99%

“…In southern California, DeLong et al (2007) studied a fluvial terrace that was cross‐cut and offset by the eastern Big Pine oblique‐reverse fault, one of a number of faults associated with the broad San Andreas transform fault system. They used quartz OSL ages to confirm geomorphic evidence that the deposits on either side of the fault scarp were originally part of the same terrace surface (Fig 6B).…”

mentioning

confidence: 99%

Luminescence dating of fluvial deposits: applications to geomorphic, palaeoseismic and archaeological research

Rittenour

2008

Boreas

293

177

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Fluvial deposits and landforms are important archives of river response to climate, tectonics and base level change and are commonly associated with archaeological sites. Unlike radiocarbon dating, the target material for optically stimulated luminescence (OSL) dating (sands and silts) is nearly ubiquitous in fluvial deposits and the age range for OSL spans the last glacial-interglacial cycle, a time period of interest to many Quaternary scientists. Recent advances in OSL techniques and the development of single-grain dating capabilities have now allowed fluvial deposits, and other deposits commonly afflicted with incomplete zeroing of the luminescence signal, to be dated. The application of OSL dating to fluvial deposits is discussed with respect to its potential to provide important contributions to research in the fields of geomorphology, palaeoseismology and archaeology. Examples are given from each research field.

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“…In the Cuyama Valley (c. 42 km southeast of the southeast end of the La Panza Range; Fig. 1), OSL-based geochronology indicates that a terrace sequence was deposited by the Cuyama River between 45 and 30 ka (DeLong et al, 2007). The similarity of these dates, which are some of the first estimated ages of alluvium in the Transverse and central Coast Ranges of California, is noteworthy, and may reflect a regional climatic event that led to stream aggradation.…”

Section: Age Of Qa1 Alluviummentioning

confidence: 90%

The influence of upper-crust lithology on topographic development in the central Coast Ranges of California

Díaz

Mahan

2012

Geomorphology

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Late Quaternary alluviation and offset along the eastern Big Pine fault, southern California

Cited by 8 publications

References 17 publications

Climate-controlled landscape evolution in the Western Transverse Ranges, California: Insights from Quaternary geochronology of the Saugus Formation and strath terrace flights

Climate-controlled landscape evolution in the Western Transverse Ranges, California: Insights from Quaternary geochronology of the Saugus Formation and strath terrace flights

Luminescence dating of fluvial deposits: applications to geomorphic, palaeoseismic and archaeological research

The influence of upper-crust lithology on topographic development in the central Coast Ranges of California

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