Geomorphological analysis of neotectonic deformation, northern Owens Valley, California

Pinter, Nicholas; Keller, Edward A.

doi:10.1007/bf00192251

Cited by 29 publications

(29 citation statements)

References 20 publications

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“…Subsequently, vertical offset along the normal Sierra Nevada frontal fault zone (SNFFZ) created the escarpment ca. 2-8 Ma (Pinter and Keller, 1995;Bachman, 1978). Although isotherm bending beneath topography can occur (Ehlers and Farley, 2003), in this case the thermal structure recorded by bedrock AHe ages predates creation of the modern topography.…”

Section: Field Settingmentioning

confidence: 95%

Where does sediment come from? Quantifying catchment erosion with detrital apatite (U-Th)/He thermochronometry

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Ehlers

Farley

2006

Geol

121

140

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We present a new method for tracing sediment using detrital apatite (U-Th)/He (AHe) thermochronometry, and use this to quantify the spatial distribution of catchment erosion in the eastern Sierra Nevada, California. Well-developed age-elevation relationships permit detrital AHe ages to track the elevations where sediment grains were shed from bedrock. We analyzed sediment exiting nonglaciated Inyo Creek and adjacent (formerly) glaciated Lone Pine Creek. Statistical comparison of measured AHe age probability density functions (PDFs) with predicted PDFs based on catchment hypsometries suggests that Inyo Creek is eroding uniformly, consistent with field observations of weathered hillslopes tightly coupled to the fluvial system. In contrast, significant mismatch between measured and predicted PDFs from Lone Pine Creek reveals that sediment derives primarily from the lower half of the catchment. The dearth of older ages is likely due to sediment storage in cirques and moraines and/or focused erosion at intermediate elevations, both potential consequences of glacial modification. Measured PDFs can also improve cosmogenic nuclide-based erosion rates by more accurately scaling nuclide production rates. Our results demonstrate the utility of detrital AHe thermochronometry for quantifying erosion in fluvially and glacially sculpted catchments.

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Section: Field Settingmentioning

confidence: 95%

Where does sediment come from? Quantifying catchment erosion with detrital apatite (U-Th)/He thermochronometry

Stock

Ehlers

Farley

2006

Geol

121

140

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“…The pre-Tahoe and Tahoe glaciations are two time periods when the channels were likely active (Pinter & Keller, 1995); however this has not been definitively shown. The pre-Tahoe and Tahoe glaciations are two time periods when the channels were likely active (Pinter & Keller, 1995); however this has not been definitively shown.…”

Section: Geological Settingmentioning

confidence: 96%

“…The pre-Tahoe and Tahoe glaciations are two time periods when the channels were likely active (Pinter & Keller, 1995); however this has not been definitively shown. Though the history of channel occupation is not completely known, what is important to our study is that the channel incision is coeval with Tableland fault evolution, and that channel morphology here is driven by local faulting (Bateman, 1965;Pinter & Keller, 1995;Gilpin, 2003). 70 to 300 ka.…”

Section: Geological Settingmentioning

confidence: 96%

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Changes in bedrock channel morphology driven by displacement rate increase during normal fault interaction and linkage

Hopkins

Dawers

2014

Basin Research

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We attribute changes in the morphology of relay ramp channels (increased slope and decreased width) to variations in displacement rate on ramp-adjacent normal faults. We map the faults and fluvial channels associated with four sites in different stages of fault interaction and linkage on the Volcanic Tableland, a Late Pleistocene ash-flow tuff in east-central California. Because these channels are inactive today, we estimate downstream changes in channel width and depth using HEC-RAS, a one-dimensional open channel flow model. Our results show that channel slope must be greater than about 0.05 before there are substantial decreases in width or substantial increases in depth. Displacement rate increases during interaction between en echelon segments results in the increases in channel slope and decreases in channel width. Moreover, our data show that these changes begin to occur during the very early stages of fault interaction, well before the fault geometry would indicate ongoing or imminent linkage.

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“…But in case of tilting, the contours on the surface will represent segments of ellipses with their long axes oriented parallel to the direction of tilting (Pinter and Keller, 1995) (Fig. 9a).…”

Section: Fan Tilt and Fan Axis Orientationmentioning

confidence: 99%

Overprint of neotectonism along the course of River Chel, North Bengal, India

Mandal

Sarkar

2016

Journal of Palaeogeography

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This paper aims to unveil neotectonic imprints in topography, drainage and sediments in the 46.25 km long course of the River Chel from its source down to its alluvial fan at the base of the Himalayan Mountain Front in the DarjeelingeJalpaiguri districts of India. A semi-circular ridge delimits its primary catchment. Within confinement of this watershed basin the drainage pattern is composite being convergent along the periphery and divergent on a butte inside. All these geomorphic neotectonic imprints are accompanied by ramp and flat structures and spectacular mylonitization of rocks.High hypsometric index and convex shape of the hypsometric curve derived from the central near-straight course of the river between the primary catchment and the Main Frontal Thrust (MFT) also reflects tectonic youthfulness of the river course. It is well manifested also in widely variable stream index and stream gradient index ratios (SL/K) often exceeding 2. In response to neotectonism, this river course as a whole shifted westward between 1962 and 2007. Maximum reduction of the stream gradient on top of the MFT is eloquent enough about recent uplift of the thrust ridge. The high average slope gradient of canyon wall about 45.68 is well consistent with this uplift. Very low channel-width/valley-height ratio along the river further corroborates the uplift. The alluvial fan system of the River Chel is comprised of five morphogenetic fans stacked one above another with a tendency to shrink and shift progressively upslope. They differ from each other in terms of tilt, axial orientation, primary depositional surface gradient and convexity in transverse section and thus present a writ of ongoing tectonism. Progressive upward increase in the share of distal crystalline rocks in clast composition within alluvial fan package is a clear proxy for southerly advancement of the MFT. Concomitant increase in maximum clast size is in good agreement with sediment source uplift. All the five fans are, however, dormant now. Present-day River Chel deeply incises through all of them and suggests further basement uplift in the context of frequent evidences of neotectonism all around, although the role of climate remains uncertain in absence of adequate data.

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Geomorphological analysis of neotectonic deformation, northern Owens Valley, California

Abstract: At the western edge of the Basin and Range

Cited by 29 publications

References 20 publications

Where does sediment come from? Quantifying catchment erosion with detrital apatite (U-Th)/He thermochronometry

Where does sediment come from? Quantifying catchment erosion with detrital apatite (U-Th)/He thermochronometry

Changes in bedrock channel morphology driven by displacement rate increase during normal fault interaction and linkage

Overprint of neotectonism along the course of River Chel, North Bengal, India

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