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运用离子微探针分析技术测定了广东麒麟的 5个幔源角闪石巨晶的氢同位素组成 .无论是 5个样品之间 ,还是每个样品内部 ,δD值和氢含量都十分均一 ,说明其形成环境很稳定 .麒麟角闪石的源区具有高于地幔原始值的δD值 ( - 30‰～ - 4 0‰ ) ,说明源区存在再循环的地壳组分 .再循环地壳组分的来源可能与中生代时期太平洋板块向欧亚板块的俯冲有关 ,俯冲过程也可能是引起样品具有Dupal异常的原因
The isotopic compositions of five mantle-source amphibole macrostructures in the unicorn of Guangdong were determined using the ion microprobe analysis technique. The δD value and hydrogen content were very uniform between 5 samples and within each sample, indicating their formation The environment is very stable. The source region of unicorn amphiboles has a δD value (- 30 ‰ ~ -4 0 ‰) higher than the original value of the mantle, indicating that there are recirculated crust components in the source region. And the subduction of the Pacific plate to the Eurasian plate during the Mesozoic period. The subduction process may also be the reason that the sample has the Dupal anomaly