Geochemical stratification in the upper mantle beneath NE China
Geochemical stratification in the upper mantle beneath NE China
复制标题
中国东北地区上地幔地球化学层结
DOI：
10.1029/90gl02716
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Y. Tatsumi
中科院分区：
文献类型：
--
作者：
S. Nohda;Hai Chen;Y. Tatsumi
利用橄榄石最大分馏模型估算了中国东北地区新生代富镁玄武岩的原生岩浆成分。这些数据与现有的实验数据一起给出了每个玄武岩岩浆的岩浆分离深度的估计，这与87 Sr/86 Sr同位素比值呈负相关，与143 Nd/144 Nd同位素组成呈正相关。这一观测结果可能为富集的上地幔下伏于亏损的软流圈地幔储集层提供了令人信服的证据。
Compositions of primary magmas were estimated for Cenozoic Mg-rich basalts from the NE China region based on the olivine maximum fractionation model. These data together with available experimental data gave an estimate for magma segregation depth for each basalt magma, which is inversely correlated with 87Sr/86Sr isotopic ratio and positively correlated with 143Nd/144Nd isotopic composition. This observation may provide convincing evidence that the enriched upper mantle is underlain by more depleted asthenosphere mantle reservoir.