福建沿海动力变质带南段变质侵入岩岩石成分迁移规律的研究

Characters of the Metamorphic Intrusion in the South Sectionof Fujian Coastal Dynamometamorphic Belt

通过 1∶ 2 5万厦门市、东山县幅区域地质调查 ,在福建沿海动力变质带南段中同种原岩不同变形强度的动力变质岩进行了岩石化学分析 ,揭示了晚侏罗世侵入岩在动力变质过程中 ,从未变形岩石到糜棱岩化岩石、初糜棱岩、糜棱岩、超糜棱岩的变化过程中岩石化学成分的变化规律。该研究为动力变质岩的原岩恢复提供了依据 ,并为岩石韧性变形过程中岩石化学成分迁移这一理论研究提供了资料。

By systematic petrochemical analysis of the dynamometamorphic rocks, w hich were changed from same protolite by deformation in difference intensity, in the south section of Fujian coastal dynamometamorphic belt, it is revealed that the petrochemical compositions of the late Jurassic intrusive rocks regularly t ransmigrated in dynamometamorphic processWith increasing the deformation inten sity, the intrusive rocks changed from undeformed rocks to mylonitized rock, sub mylonite, mylonite and super mylonite, and the petrochemical compositions also c hanged gradually: SiO 2 and KO 2 are concentrated, and Fe 2O 3+FeO, MgO and CaO are depleted, but Al 2O 3 are few changedIn addition, the change of Na 2O is negative correlation with K 2O,and Fe 2O 3 and Fe 2O has similar relat ion alsoThis research provided effectual evidence for the recovery about these rock's protolite, an d provided effective datum for the study of problem about composition transmigra tion of the dynamometamorphic rocks in ductile deformed process