Wang DB(王冬兵)1; Tang Y(唐渊)1; Luo L(罗亮)1; Liao SY(廖世勇)2; Yin FG(尹福光)1; Wang BD(王保弟)1
Source Publicationactapetrologicasinica
AbstractThe ailao shan tectonic belt is an important tectonic boundary in southeast of the qinghai-tibetan plateau and consists mainly of high-grade metamorphic rocks previously thought to be paleoproterozoic basement rocks. in-situ la-icp-ms u-pb age and trace element of zircons were determined for the ailao shan high-grade metamorphic rocks. zircon u-pb geochronological data indicate that the high-grade metamorphic rocks have various parent rocks with different intrusive/depositional ages of 728 +/- 8ma, 727 +/- 3ma and 231 +/- 4ma and similar metamorphic ages of 27. 8 similar to 23. 7ma. our new results demonstrate that the high-grade metamorphic rocks from the ailao shan belt zone are a mixture of metamorphic both igneous and sedimentary rocks of different times, instead of solely paleoproterozoic basement rocks. migmatization and metamorphic crystallization of these rocks took place at 27. 8 similar to 23. 7ma, indicating a significant period of crustal anatexis in the ailao shan tectonic belt. the syntectonic felsic dykes hosted by gneiss were derived from a mixture of locally-derived and allochthonous melts. the migmatized rocks from the ailao shan deformation zone were most probably the results of decompression melting following peak metamorphism. the crustal anatexis and left-lateral shearing were two synchronous metamorphic patterns resulted from a shared geological event. they interact and influence each other during exhumation of the ailao shan metamorphic zone in late oligocene.
Document Type期刊论文
Recommended Citation
GB/T 7714
Wang DB,Tang Y,Luo L,et al. lateoligocenecrustalanatexisandmeltfluidmigrationintheailaoshantectonicbeltevidencesfromzirconupbagesandtraceelementcompositions[J]. actapetrologicasinica,2017,33(7):2037.
APA 王冬兵,唐渊,罗亮,廖世勇,尹福光,&王保弟.(2017).lateoligocenecrustalanatexisandmeltfluidmigrationintheailaoshantectonicbeltevidencesfromzirconupbagesandtraceelementcompositions.actapetrologicasinica,33(7),2037.
MLA 王冬兵,et al."lateoligocenecrustalanatexisandmeltfluidmigrationintheailaoshantectonicbeltevidencesfromzirconupbagesandtraceelementcompositions".actapetrologicasinica 33.7(2017):2037.
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