【摘 要】
：
Orogenic garnet peridotites(metamorphic rocks containing the characteristic HP garnet-olivine mineral assemblage)exposed in ancient orogenic belts may contain quantitative data regarding formation of
【机 构】
：
Institute of Geology,Chinese Academy of Geosciences,Beijing,China;Dept. of Earth Sciences,Structural
【出 处】
：
International Workshop on: Ophiolites, Mantle Processes and
论文部分内容阅读
Orogenic garnet peridotites(metamorphic rocks containing the characteristic HP garnet-olivine mineral assemblage)exposed in ancient orogenic belts may contain quantitative data regarding formation of subcontinental/subcratonic lithosphere,evolution of a lithospheric mantle wedge,incorporation of garnet peridotite into subducted continental crust,subsequent(ultra-)high pressure metamorphism during ongoing continental subduction and final exhumation back to subcrustal levels.Allowing a more systematic way to investigate such variables in nature we propose here a simplified conceptual model that can be used to classify orogenic garnet peridotites.In addition to the “classic” mantle wedge-versus subduction zone garnet peridotites,the model subdivides mantle wedge garnet peridotites into four subtypes,called type A,B,C and D,equivalent to young/hot/dynamic-versus cold/old/static mantle in thick or thin garnet-olivine bearing mantle wedges.
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