Very high-pressure orogenic garnet peridotites
Very high-pressure orogenic garnet peridotites
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DOI：
10.1073/pnas.0607300104
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发表时间：
2007-05
期刊：
影响因子：
--
通讯作者：
J. Liou;R. Zhang;W. Ernst
中科院分区：
文献类型：
--
作者：
J. Liou;R. Zhang;W. Ernst
地幔成因的石榴石橄榄岩是许多大陆俯冲和碰撞期间形成的超高压变质地体中的次要成分。其中一些地幔岩石含有微量的锆石和微米级的包裹体。组成矿物具有俯冲前和俯冲后的微结构，包括多晶型转化和矿物出溶。使用高空间、时间和能量分辨率的新技术进行的实验、矿物学、石油化学和地质年代学表征导致了新相的意外发现，为深部地幔过程提供了更好的约束。
Mantle-derived garnet peridotites are a minor component in many very high-pressure metamorphic terranes that formed during continental subduction and collision. Some of these mantle rocks contain trace amounts of zircon and micrometer-sized inclusions. The constituent minerals exhibit pre- and postsubduction microstructures, including polymorphic transformation and mineral exsolution. Experimental, mineralogical, petrochemical, and geochronological characterizations using novel techniques with high spatial, temporal, and energy resolutions are resulting in unexpected discoveries of new phases, providing better constraints on deep mantle processes.