Major and trace element and isotopic analysis of magmatic clinopyroxenes from a single Samoan hotspot lava.

Abstract: The data presented here include high precision Sr and Nd isotopic analyses on individual magmatic clinopyroxenes measured by thermal ionization mass spectrometry. Major and trace element concentrations have also been measured on each cpx crystal. The magmatic clinopyroxene grains derive from a single, geochemically enriched (high 87Sr/86Sr) lava from Savai'i Island, western Samoa exhibiting the enriched mantle 2 signature. Clinopyroxenes show extreme variability in 87Sr/86Sr overlapping a significant portion of the variability observed in all Samoan shield lavas and global ocean island basalts.

Other Description: Adams, J.V., Jackson, M.G., and Spera, F.J., "Extreme isotopic heterogeneity in Samoan clinopyroxenes helps constrain sediment recycling." Nature Communications, in revision.

摘要：本数据集包含采用热电离质谱法（thermal ionization mass spectrometry）测定的单颗岩浆单斜辉石（magmatic clinopyroxenes）的高精度Sr、Nd同位素分析数据，同时完成了每一颗单斜辉石晶体的主量与微量元素含量测定。所用岩浆单斜辉石颗粒取自西萨摩亚萨瓦伊岛的一处单一地球化学富集型（高87Sr/86Sr比值）熔岩，该熔岩呈现富集型地幔2（enriched mantle 2）的同位素特征。这些单斜辉石的87Sr/86Sr比值存在极端分异，其变化区间覆盖了萨摩亚所有盾状熔岩以及全球洋岛玄武岩（ocean island basalts）中观测到的绝大部分同位素变异范围。

其他说明：Adams, J.V.、Jackson, M.G. 与 Spera, F.J. 合著的题为《萨摩亚单斜辉石的极端同位素非均质性可为沉积物循环提供约束》的论文，目前正在《自然-通讯》（Nature Communications）期刊进行返修评审。