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...
| Main Authors: | , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2004
|