Chemical evolution of the upper mantle : Constraints from pressure temperature history of the major European peridotite bodies.

为了了解上地幔的化学演化，我们研究了发生在欧洲的造山地幔体的上升历史：比利牛斯山的橄榄岩体，隆达超镁铁质杂岩和Lanzo超镁铁质杂岩。我们在这三个超镁铁质岩体中进行了野外调查，采集了大量样品，并进行了薄片观察、电子探针分析和扫描电镜/电子背散射衍射分析。我们估计了这些超镁铁岩体的减压历史，包括初始条件。结果进行了比较与我们的数据的Horoman超镁铁岩杂岩，北海道。岩石圈地幔上升历史具有很大的变化，每一变化都对应着岩石圈和软流圈地幔热-力相互作用的动力学过程。

In order to understand the chemical evolution of the upper mantle, we have examined ascent history of orogenic mantle bodies occurring in Europe : peridotite masses in Pyrenees, Ronda ultramafic complex, and Lanzo ultramafic complex. We conducted field survey in the three ultramafic bodies and collected many samples, on which thin section observation, EPMA analysis, and SEM/EBSD analysis were made. We estimated decompressional histories of these ultramafic bodies including the initial condition. The results were compared with our data on the Horoman ultramafic complex, Hokkaido. There is a wide variation in ascent history of lithospheric mantle, each of which corresponds to dynamics of thermal and mechanical interaction of lithospheric and asthenospheric mantle.