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Heterogeneity of water in UHP eclogites from Bixiling in Dabieshan: Evidence fromgarnet
作者姓名:SHENGYingming  XIAQunke  YANGXiaozhi
作者单位:SchoolofEarthandSpaceSciences,UniversityofScienceTechnologyofChina,Hefei230026,China
摘    要:Garnets in ultrahigh pressure (UHP) eclogites from Bixiling in Dabieshan were investigated by Fourier transform infrared spectrometer (FTIR). The results demonstrate that all garnets contain structural water which occurs as hydroxyl (OH), with contents ranging from 164 to 2034 ppm (H2O wt.) and mostly higher than 500 ppm. Like omphacite which is another major OH-rich mineral in eclogites, garnet is an important carrier that can recycle the surface water into deep mantles. Heterogeneity of water in garnets exists not only among different samples of the same outcrop (~150 m), but also among different crystals of the same sample (~1 cm). This indicates that the mobility of fluids during UHP metamorphism is very limited (possibly on centimeter scales), and that both subduction and exhumation processes of UHP rocks are very fast.

关 键 词:异质性  榴辉岩  石榴石  大别山  Fourier变换红外分光计
收稿时间:29 October 2003
修稿时间:2003-12-30

Heterogeneity of water in UHP eclogites from Bixiling in Dabieshan: Evidence from garnet
SHENGYingming XIAQunke YANGXiaozhi.Heterogeneity of water in UHP eclogites from Bixiling in Dabieshan: Evidence from garnet[J].Chinese Science Bulletin,2004,49(5):481-486.
Authors:Yingming?Sheng  Email author" target="_blank">Qunke?XiaEmail author  Xiaozhi?Yang
Institution:(1) School of Earth and Space Sciences, University of Science Technology of China, 230026 Hefei, China
Abstract:Garnets in ultrahigh pressure (UHP) eclogites from Bixiling in Dabieshan were investigated by Fourier transform infrared spectrometer (FTIR). The results demonstrate that all garnets contain structural water which occurs as hydroxyl (OH), with contents ranging from 164 to 2034 ppm (H2O wt.) and mostly higher than 500 ppm. Like om-phacite which is another major OH-rich mineral in eclogites, garnet is an important carrier that can recycle the surface water into deep mantles. Heterogeneity of water in garnets exists not only among different samples of the same outcrop (-150 m), but also among different crystals of the same sample (-1 cm). This indicates that the mobility of fluids during UHP metamorphism is very limited (possibly on centimeter scales), and that both subduction and exhumation processes of UHP rocks are very fast.
Keywords:heterogeneity  structural water  garnet  UHP eclogites  Bixiling  Dabieshan  
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