Basic volcanic rocks occur in a relatively extensional environment. The magma comes from the depth with a depletedmantle 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；
2
Integrated study indicates that the two protolith suites of mantle peridotites represent remnants after polyphase melting of differently depletedmantle 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。
3
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.