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January 1, 1997Geology

Quaternary downcutting rate of the New River, Virginia, measured from differential decay of cosmogenic 26Al and 10Be in cave-deposited alluvium

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Authors

DGDarryl E. GrangerJKJames W. KirchnerRFRobert C. Finkel

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Overview

Geochronological analysis reveals a river incision rate of 27.3 meters per million years in cave sediments, suggesting long-term regional tectonic tilting.

Key Points

  • Determine the Quaternary downcutting rate of the New River and assess regional tectonic activity using cosmogenic burial dating.
  • Measured concentrations of the cosmogenic radionuclides aluminum-26 (26Al) and beryllium-10 (10Be) in quartz from river-deposited sediments.
  • Calculated burial ages across a vertical sequence of caves located along the New River gorge.
  • Constrained the Quaternary river downcutting rate to 27.3 ± 4.5 m/m.y. based on the differential decay of 26Al and 10Be.
  • Provided geomorphic evidence indicating the presence of regional tectonic tilt.

Cite This Study

Granger et al. (1997) studied this question.

synapsesocial.com/papers/69ff4bd864548b97a42d64bbhttps://doi.org/10.1130/0091-7613(1997)025<0107:qdrotn>2.3.co;2
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Also Consider

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