Big difference of 87Sr/86Sr ratios between basalt and basin water:Higher 87Sr/86Sr ratios in plagioclase
By analyzing the 87Sr/86Sr ratios of basaltic rocks and basin water in Xuyi,China,we found that there is a big difference of 87Sr/86Sr ratios between them,which may change the traditional viewpoints of the contribution of basalt weathering in end member analysis.In-house weathering experiment proved that rainwater and dust arent the reason for this difference.By picking the major minerals in basalt,we found that plagioclase has much higher 87Sr/86Sr ratios than basalt and basin water,which might be the reason for the difference of 87Sr/86Sr ratios between basalt and basin water.We infer that low-temperature hydrothermal alteration increased the 87Sr/86Sr ratios of plagioclase.Therefore,we should keep in mind that the 87Sr/86Sr ratios of basin water and plagioclase are higher than basaltic rocks when analyzing the end member contribution in a mixed rock basin.
Laifeng Li Gaojun Li
MOE Key Laboratory of Surficial Geochemistry,Department of Earth Sciences,Nanjing University,163 Xianlindadao,Nanjing 210046,China
国际会议
The 11th International Symposium on Geochemistry of the Earths Surface(GES-11)(第十一届地球表层地球化学国际研讨会)
贵阳
英文
1-3
2017-06-11（万方平台首次上网日期，不代表论文的发表时间）