原始地幔与现今的地幔极不相同，它在地核出现之后、地壳与亏损地幔（depleted mantle）分离之前形成。最近在加拿大北部与格陵兰岛的玄武岩高原区，科学家们发现了地球原始地幔的踪迹。
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model age to depleted mantle 亏损地幔模式年龄
Nd depleted mantle model age Nd亏损地幔模式年龄
depleted mantle source 亏损的地幔源
depleted d mantle 贫化地幔
We chose Ln(Co*Cr*Ni), Nb/Ta, plumbum isotopes composition, neodymium isotope two stage model age of depleted mantle (T2DM) andεNd(t) indexs to express the information and give the introduction of theory in the relevant chapters.2.
笔者尝试提出用Ln(Co*Ni*Cr)、Nb/Ta、铅同位素、钕同位素二阶段亏损地幔模式年龄（T2DM）及εNd(t)等地球化学指标表达以上信息，并在相应的章节对指标进行了理论介绍。
参考来源 - 秦岭—大别造山带地壳化学结构、地球化学分区及编图·2,447,543篇论文数据，部分数据来源于NoteExpress
Basic volcanic rocks occur in a relatively extensional environment. The magma comes from the depth with a depleted mantle nature.
其中，基性火山岩形成于走滑相对伸展环境，岩浆源自较深部，具亏损地幔性质；
Integrated study indicates that the two protolith suites of mantle peridotites represent remnants after polyphase melting of differently depleted mantle in different tectonic environments.
综合研究表明该两套地幔岩原岩组合代表了不同亏损程度和不同构造环境下多期熔融的地幔残余。
The zircons we studied were depleted in oxygen 18 relative to the mantle, and such depletion occurs only if the crystals formed from rocks that interacted with rain or snow.
因为相较于地函，我们所研究的锆石，氧18含量偏低，而这种情形只有可能是晶体的母岩曾经和雨水或雪发生交互作用。
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