The effects of weathering on whole-rock Rb-Sr ages of granitic rocks

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ID: 297942
1968
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Abstract
Four weathered samples of the Cape Ann Granite from Massachusetts average ten percent younger than the age from the whole-rock isochron. Fourteen fresh samples from the Petersburg Granite, Virginia, do not define an isochron, but the average age of seven weathered samples is 8 to 15 percent younger than the average of the fresh samples. For Petersburg Granite, the minimum age and maximum (Sr-87/Sr-86) ~o~ ratio are 460 m.y. and 0.7245 respectively. Assuming a (Sr-87/Sr-86) ~o~ ratio of 0.705, the maximum age is 690 m.y. The Petersburg Granite is late Precambrian to early Paleozoic in age.
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Authors Michael L. Bottino, Paul D. Fullagar
Journal american journal of science
Year 1968
DOI
10.2475/ajs.266.8.661
URL
https://ajs.scholasticahq.com/article/59259.pdf
Keywords Keywords not found

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