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Artigo Acesso aberto Revisado por pares
BIBTEX RIS

The Arc of Peru

1907; American Association for the Advancement of Science; Volume: 26; Issue: 668 Linguagem: Inglês

10.1126/science.26.668.519

ISSN

1095-9203

Autores

Isaac Winston,

Tópico(s)

Botany and Geology in Latin America and Caribbean

Resumo

Simplon are : (a) The Jura-Trias sediments, lithologically often much alike and much interfolded; (b) the Paleozoic crystalline schists ; and (c) the gneiss of Monte Leone and the Antigorio gneiss, both stated to be of Archaan age.These rocks throughout contain radium, and for the most part in quantities much above what hitherto has been ascribed to sedimentary or igneous rocks.Some thirty-six typical samples, taken from various points in the tunnel, have been examined.The poorest in radium are certain anhydrite rocks.Certain amphibolite schists go very high.The Antigorio gneiss rises from 10.5 X 10-l2 and 8.0 X 10-l2 grams radium -ner gram of rock -

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