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Discussion on the ultrahigh-pressure metamorphism of Caledonian garnet amphibolite in the Qinzhou-Hangzhou joint belt
Author(s): 
Pages: 79-88
Year: Issue:  2
Journal: Resources Survey & Environment

Keyword:  ultrahigh-pressure metamorphismclockwise P-T-t pathgarnet amphiboliteCaledonianthe Qinzhou-Hangzhou joint belt;
Abstract: By studying on the chronology,mineralogy and metamorphism of Caledonian garnet amphib-olite first discovered in the Qinzhou-Hangzhou joint belt,it is concluded that the garnet amphibolite, which possesses typical clockwise P-T-t path including amphibolite-facies prograde metamorphism in early stage,eclogite-facies(UHP)peak metamorphism in middle stage and amphibolite-facies retrogressive met-amorphism in late stage,yields a metamorphic age of 454±4 Ma.The mineral assemblage of the amphibo-lite-facies prograde metamorphism in early stage is amphibole(Amp)+plagioclase(Pl)+quartz(Qtz)with temperature of 71 9℃~795℃ and pressure of 7.56Kpa~8.30Kpa,the eclogite-facies(UHP)peak meta-morphism in middle stage has the mineral assemblage of garnet(Gt)+ akmite (retrograde to diopside+al-bite)±Qtz with temperature of 668℃~821℃ and pressure of 26.42 Kpa~33.46 Kpa,the amphibolite-fa-cies retrogressive metamorphism in late stage is composed of Gt + Amp + Pl ± Qtz with temperature of 61 1℃~854℃ and pressure of 4.76 Kpa~9.30 Kpa.Combined with the previous studies,it is proposed that the Qinzhou-Hangzhou joint belt had undergone evolutionary process of eclogite-facies(UHP)meta-morphism,granulite-facies retrogressive metamorphism and amphibolite-facies retrogressive metamor-phism in Caledonian.The first discovery of the Caledonian UHP metamorphism in the Qinzhou-Hangzhou joint belt indicates that the collision between Cathaysia and Yangtzs blocks occurred in Caledonian.
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