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Radiocarbon Dates for Lava Flows and Pyroclastic Deposits on São Miguel, Azores

Published online by Cambridge University Press:  18 July 2016

Richard B Moore  and
Meyer Rubin
Richard B Moore
Affiliation:
US Geological Survey, Federal Center, MS 903, Denver, Colorado 80225
Meyer Rubin
Affiliation:
US Geological Survey, National Center, MS 971, Reston, Virginia 22092
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We report 63 new radiocarbon analyses of samples from São Miguel, the largest (ca 62 × 13km) and most populous (ca 150,000 inhabitants) island in the Azores archipelago (Fig 1). The samples are mainly carbonized tree roots and other plant material collected from beneath 20 mafic lava flows and spatter deposits and from within and beneath 42 trachytic pyroclastic flow, pyroclastic surge, mudflow, pumice-fall, and lacustrine deposits and lava flows. One calcite date is reported. The samples were collected during geologic mapping of the entire island (Moore, in press A; sample locations are shown on this map). Nine 1:25,000-scale topographic maps, published in 1983 by the Portuguese Army Cartographic Service, cover the island; samples and locations described below refer to these named sheets.

Type
Date Lists
Information
Radiocarbon , Volume 33 , Issue 1 , 1991 , pp. 151 - 164
Copyright
Copyright © The American Journal of Science 

References

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