『Abstract
　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 existing 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.

Keywords: detrital thermochronometry; apatite (U-Th)/He; cosmogenic nuclides; erosion;; Sierra Nevada』

Introduction
Quantifying spatially variable catchment erosion
Field setting
Methods and results
Discussion
Estimating catchment erosion rates
　『Assuming steady-state conditions, catchment erosion rates can be derived by dividing observed detrital cooling age ranges into catchment relief (Ruhl and Hodges, 2005). For Inyo and Lone Pine Creeks, this yields erosion rates of 0.04-0.05 mm/yr.』
Conclusions
Acknowledgments
References cited

• Ehlers,T.A. and Farley,K.A.(2003): Apatite (U-Th)/He thermochronometry: methods and applications to problems in tectonic and surface processes. Earth and Planetary Science Letters, 206, 1-14.【見る→】
  『アパタイト（U-Th）/He熱時間測定：方法と構造運動・地表過程における問題への適用』
• Ruhl,K.W. and Hodges,K.V.(2005): The use of detrital mineral cooling ages to evaluate steady-state assumption in active orogens: An example from the central Nepalese Himalaya. Tectonics, 24, TC4015, doi: 10.1029/2004TC001712.

• GSA DATA REPOSITORY ITEM DR2006152　　ftp://rock.geosociety.org/pub/reposit/2006/2006152.pdf
  APPENDIX 1: SAMPLE PREPARATION AND ANALYTICAL TECHNIQUES
  　Apatite (U-Th)/He thermochronometry
  　Constructing and comparing predicted and measured AHe PDFs
  　Assessing the quality of AHe ages
  　Cosmogenic ¹⁰Be-based catchment erosion rate
  　Additional references
  　Table DR1. Bedrock apatite (U-Th)/He data from Inyo Creek and Lone Pine Creek catchments
  　Table DR2. Detrital apatite (U-Th)/He data from Inyo Creek and Lone Pine Creek catchments
  　Table DR3. Kuiper Equality Test results (alpha = 0.05) for comparisons of predicted and measured PDFs from Inyo Creek and Lone Pine Creek catchments
  　Table DR4. Cosmogenic ¹⁰Be concentration and erosion rate for the Inyo Creek catchment
  　　Erosion rate (mm/yr)　　0.24 ± 0.03