210Pb-226Ra and 228Ra-232Th systematics in young arc lavas: Implications for magma degassing and ascent rates

210Pb-226Ra and 228Ra-232Th systematics in young arc lavas: Implications for magma degassing and ascent rates

New data show that island arc rocks have (210Pb/226Ra)o ratios which range from as low as 0.24 up to 2.88. In contrast, (228Ra/232Th) appears always within error of 1 suggesting that the large 226Ra-excesses observed in arc rocks were generated more than 30 years ago. This places a maximum estimate...

书目详细资料
Main Authors:	Turner, S, Black, S, Berlo, K
格式:	Journal article
语言:	English
出版:	2004

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