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@article{Hughes:2022:10.1130/B36076.1,
author = {Hughes, A and Rood, D and DeVecchio, DE and Whittaker, AC and Bell, RE and Wilcken, KM and Corbett, LB and Bierman, PR and Swanson, BJ and Rockwell, TK},
doi = {10.1130/B36076.1},
journal = {Geological Society of America Bulletin},
pages = {2245--2266},
title = {Tectonic controls on Quaternary landscape evolution in the Ventura basin, southern California, quantified using cosmogenic isotopes and topographic analyses},
url = {http://dx.doi.org/10.1130/B36076.1},
volume = {134},
year = {2022}
}

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TY  - JOUR
AB  - The quantification of rates for the competing forces of tectonic uplift and erosion has important implications  for understanding topographic evolution. Here, we quantify the complex interplay between tectonic uplift, topographic development, and erosion recorded in the hanging walls of several active reverse faults in the Ventura  basin,  southern  California,  USA.  We  use  cosmogenic  26Al/10Be  isochron  burial  dating  and  10Be surface exposure dating to construct a basin-wide geochronology, which includes burial dating of the Saugus  Formation: an important, but poorly dated, regional Quaternary strain marker. Our ages for the top of the  exposed Saugus Formation range from 0.36 +0.18/-0.22 Ma to 1.06 +0.23/-0.26 Ma and our burial ages near the base  of shallow marine deposits, which underlie the Saugus Formation, increase eastwards from 0.55 +0.08/-0.07 Ma to 3.30 +0.30/-0.42 Ma. Our geochronology is used the calculate a rapid long-term fault throw rate of 4.7–6.3 mm yr-1 since ~1.5 Ma for the San Cayetano fault and a slip rate of 1.3–3.0 mm yr-1 since ~1.5 Ma for the Oak Ridge fault,  both  of  which  agree  with  contemporary  reverse  slip  rates  derived  from  GPS  data.  We  also  calculate  total cosmogenic nuclide (TCN)-derived catchment-averaged erosion rates that range from 0.18–2.21mm yr-1 and  discuss  the  applicability  of  TCN-derived  catchment-averaged  erosion  rates  in  rapidly-uplifting,  landslide-prone landscapes. We compare patterns in erosion rates and tectonic rates to fluvial response times and geomorphic landscape parameters to show that in young, rapidly-uplifting mountain belts, catchments  may attain a quasi-steady state on timescales <105 years, even if catchment-averaged erosion rates are still 34 adjusting to tectonic forcing.
AU  - Hughes,A
AU  - Rood,D
AU  - DeVecchio,DE
AU  - Whittaker,AC
AU  - Bell,RE
AU  - Wilcken,KM
AU  - Corbett,LB
AU  - Bierman,PR
AU  - Swanson,BJ
AU  - Rockwell,TK
DO  - 10.1130/B36076.1
EP  - 2266
PY  - 2022///
SN  - 0016-7606
SP  - 2245
TI  - Tectonic controls on Quaternary landscape evolution in the Ventura basin, southern California, quantified using cosmogenic isotopes and topographic analyses
T2  - Geological Society of America Bulletin
UR  - http://dx.doi.org/10.1130/B36076.1
UR  - https://pubs.geoscienceworld.org/gsa/gsabulletin/article/doi/10.1130/B36076.1/610673/Tectonic-controls-on-Quaternary-landscape
UR  - http://hdl.handle.net/10044/1/91456
VL  - 134
ER  -

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