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Fluid activity during exhumation of deep-subducted continental plate

Chinese Science Bulletin 2004年第10期49卷 985-998页

作者： ZHENGYongfei SchoolofEarthandSpaceSciences UniversityofScienceandTechnol-ogyofChinaHefei230026China(e-mail:yfzheng@***)

It is well known that a great deal of fluid wasreleased during subduction of oceanic crust, resulting in arcmagmatism, quartz veining and metamorphic mineralizationof syn-subduction. In contrast, the process of continentalsubduction is characterized by the relative lack of fluid andthus no arc magmatism has been found so far. During exhu-mation of deep-subducted continental crust, nevertheless,significant amounts of aqueous fluid became available fromthe decomposition of hydrous minerals, the decrepitation ofprimary fluid inclusions, and the exsolution of structuralhydroxyls. This kind of metamorphic fluid has recently at-tracted widespread interests and thus been one of the mostimportant targets in deciphering the geological processesconcerning metamorphism, magmatism and mineralizationin collisional orogens. A large number of studies involvingstable isotopes, fluid inclusions and petrological phase rela-tionships have been accomplished in past a few years withrespect to the mobility and amount of metamorphic fluid inUHP metamorphic rocks from the Dabie-Sulu orogenic *** results demonstrate that the fluid activity during theexhumation of deep-subducted continental crust has the fol-lowing effects: (1) amphibolite-facies retrogression due topervasive fluid flow; (2) formation of HP quartz veins withineclogites due to channelized fluid flow; and (3) partial melt-ing of overlying crustal rocks due to focused fluid flow, pro-ducing syn-exhumation magmatism within the orogenic *** particular, the aqueous fluid released by decompressionexsolution of hydroxyl from UHP minerals is characterizedby low salinity and is capable of resulting in pervasive andchannellized flow. Therefore, the intensive study of fluid ac- tivity during exhumation of UHP metamorphic rocks can notonly provide insight into geodynamic processes that occurred in continental collisional belts, but also shed light on under- standing of crust-mantle recycling and relevant magmatism in subduction

关键词：大陆板快深俯冲含水矿物超高压变质减压剥落流活性结构羟基稳定同位素流包含物岩石

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