Chemical Characterization of Basalt Flows

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The ARHCO chemical data which includes trace elements, can be used to distinguish, with a high degree of confidence, between flows in the upper (and part of the middle) Yakima basalts. They also can be used to distinguish between groupings of flows in the middle Yakima basalts, and between the lower basalts and the others. The quality of the measurements, however, was not well-controlled. The atomic absorption measurements were generally useful, but contained a significant number of poor values. The quality of the neutron activation data, with the exception of the Cr values, was generally well below that which can ... continued below

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Asaro, Frank & Michel, Helen V. April 1, 1977.

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Description

The ARHCO chemical data which includes trace elements, can be used to distinguish, with a high degree of confidence, between flows in the upper (and part of the middle) Yakima basalts. They also can be used to distinguish between groupings of flows in the middle Yakima basalts, and between the lower basalts and the others. The quality of the measurements, however, was not well-controlled. The atomic absorption measurements were generally useful, but contained a significant number of poor values. The quality of the neutron activation data, with the exception of the Cr values, was generally well below that which can presently be done. Almost all data was either poorly calibrated (Sc, Co, Eu,Ba), had variations in calibration over an extended group of samples (La, Sm, Th, Ta), or had poor precision (Tb). The poorly (but consistently) calibrated data were useful for the basalt characterization and in particular the Cr measurements were very useful. The gamma ray spectroscopy measurements, which determined K, U and Th abundances, were generally of poor precision and not very useful for characterization of the basalts. They were helpful, however, in evaluating K and Th data taken by other methods. The emission spectroscopy measurements, with few exceptions, were almost useless.

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  • Report No.: LBL--6307
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/891614 | External Link
  • Office of Scientific & Technical Information Report Number: 891614
  • Archival Resource Key: ark:/67531/metadc883448

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  • April 1, 1977

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Sept. 29, 2016, 1:50 p.m.

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Asaro, Frank & Michel, Helen V. Chemical Characterization of Basalt Flows, report, April 1, 1977; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc883448/: accessed August 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.