滇东南猛洞岩群斜长角闪岩成因及其构造意义

doi:10.13278/j.cnki.jjuese.201706114

Abstract

Abstract: Existingin schist and gneiss in Mengdong Group-Complex,the amphibolite belongs to Precambrian Formation in Laojunshan area of southeastern Yunnan, on which metamorphism and deformation superposed. The content of SiO₂ ranges from 47.0% to 50.4%. In the discrimination diagrams of Simonen,DF and A-K,it falls in the series of orthometamorphite derived from meta-basite rock. Its geochemical characters show that the total REE contents of amphibolite (w(ΣREE)=(214-267)×10^-6) exceed those of oceanic island basalt, while its distribution pattern is similar to that of oceanic island basalt in steep right-dipping with light REE enrichment. The spider diagram shows that it is enriched in Rb,Th,Ta,Nb,Ce and Sm,while depleted of Ba,Zr,Hf and Y, similar to the characteristics of the alkaline basalts within plate. The discrimination diagrams of Zr/TiO₂-Nb/Y, TiO₂-10MnO-10P₂O₅,La/10-Nb/8-Y/15,Th/Zr-Nb/Zr,and Th/Hf-Ta/Hf suggest that their protolith should be of alkaline basalt magma series in a continental rift environment. The microstructures of amphibole and plagioclase indicate that the microstructure is relatively free, with free dislocations and dislocation columns, occasionally dislocation rings or dislocation dipoles,which is in accordance with the average pressure and temperature of hornblende-plagioclase minerals of 0.88 GPa and 646℃ respectively, confirming that the highest metamorphic grade is of low amphibolite facies. According to the U-Pb dating of sphenes in plagiogneiss and metamorphic overgrowth zircon in Nanwenhe gneissic granite (230 Ma),the deformation conditions were related to the Indosinian tectono-thermal events, and during this period, the embryo of Laojunshan complex began to form.

Key words: amphibolite, geochemical, tectonic significances, southeastern Yunnan, Mengdong Group-Complex

CLC Number:

P588.3

Tan Hongqi, Liu Yuping. Genesis of Amphibolite in Mengdong Group-Complex in Southeastern Yunnan and Its Tectonic Significance[J].Journal of Jilin University(Earth Science Edition), 2017, 47(6): 1763-1783.

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Genesis of Amphibolite in Mengdong Group-Complex in Southeastern Yunnan and Its Tectonic Significance

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