230Th/U ages Supporting Hanford Site‐Wide Probabilistic Seismic Hazard Analysis

James B. Paces

doi:10.2172/1128696

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230Th/U ages Supporting Hanford Site‐Wide Probabilistic Seismic Hazard Analysis

James B. Paces

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Abstract

This product represents a USGS Administrative Report that discusses samples and methods used to conduct uranium-series isotope analyses and resulting ages and initial 234U/238U activity ratios of pedogenic cements developed in several different surfaces in the Hanford area middle to late Pleistocene. Samples were collected and dated to provide calibration of soil development in surface deposits that are being used in the Hanford Site-Wide probabilistic seismic hazard analysis conducted by AMEC. The report includes description of sample locations and physical characteristics, sample preparation, chemical processing and mass spectrometry, analytical results, and calculated ages for individual sites. Ages of innermost rinds on a number of samples from five sites in eastern Washington are consistent with a range of minimum depositional ages from 17 ka for cataclysmic flood deposits to greater than 500 ka for alluvium at several sites.

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Technical Report Report

Source-reported bounding extent: 46.042735653846506° to 48.96579381461063° latitude; -120.487060546875° to -117.1142578125° longitude. This indicates report coverage, not an exact sampling location. View area on OpenStreetMap.

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BibTeX RIS

James B. Paces. 2014. 230Th/U ages Supporting Hanford Site‐Wide Probabilistic Seismic Hazard Analysis. https://doi.org/10.2172/1128696

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