Rheology and metamorphic process in mantle wedge peridotites

本研究揭示了世界范围内橄榄岩中的橄榄石组构与其构造背景之间的关系。反长辉石是橄榄石变质相，高温蛇纹石。我们研究了反长岩的晶体结构及其与橄榄石结构的关系。此外，我们在不同程度上测量了蛇纹岩化橄榄岩的地震速度，并计算了橄榄石和蛇纹岩的织构诱发地震性质，以评估它们对整体地震各向异性的影响。并以蓝透石和lawsonite的晶体结构为基础，讨论了地幔楔中变质洋壳的流变学和地震性质。

This study showed relationships between olivine fabrics within peridotites and their tectonic background around the world. Antigorite is a metamorphic phase of olivine, high-temperature serpentine. We examined crystallographic fabrics of antigorite and its relation to olivine fabrics. Moreover, we measured seismic velocities of serpentinized peridotites in various degrees and calculated fabric-induced seismic properties of both olivine and serpentine in order to assess their effects on bulk seismic anisotropies. We also discussed the rheology and seismic properties of metamorphosed oceanic crust in the mantle wedge based on crystallographic fabrics of glaucophane and lawsonite.