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Big difference in Sr/Sr ratios of basalt and basin water: higher Sr/Sr ratios in plagioclase.
- Source :
- Acta Geochimica; Sep2017, Vol. 36 Issue 3, p486-488, 3p
- Publication Year :
- 2017
-
Abstract
- We analyzed the Sr/Sr ratios of basaltic rocks and basin water in Xuyi, China, and found a big difference, which may challenge conventional wisdom on the contribution of basalt weathering in end-member analysis. Results of an in-house weathering experiment suggest that rainwater and dust are not responsible for the difference. By isolating the major minerals in basalt, we found that plagioclase has much higher Sr/Sr ratios than bulk basalt and basin water, which might explain the difference in Sr/Sr ratios of basalt and basin water. We infer that low-temperature hydrothermal alteration increased the Sr/Sr ratios of plagioclase. Future analyses of end-member contribution in a mixed-rock basin should take into account that basin water and plagioclase have higher Sr/Sr ratios than basaltic rocks. [ABSTRACT FROM AUTHOR]
- Subjects :
- BASALT
WEATHERING
WATERSHEDS
PLAGIOCLASE
SEDIMENTARY rocks
Subjects
Details
- Language :
- English
- ISSN :
- 20960956
- Volume :
- 36
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Acta Geochimica
- Publication Type :
- Academic Journal
- Accession number :
- 126054924
- Full Text :
- https://doi.org/10.1007/s11631-017-0212-0