Petrogeochemical Characteristics of the Paleoproterozoic High-Pressure Mafic Granulite and Calc-Silicate from the Nanshankou of the Jiaobei Terrane
详细信息
- 责任者：Li Xuping (Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals ; Shandong University of Science and Technology ; Qingdao 266590 ; China) ; Liu Yun
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(7)
- 关键词：麻粒岩 ; granulite ; 岩石地球化学 ; lithogeochemistry ; 硅酸盐岩 ; silicate rocks ; 山东 ; Shandong Province
- 页码：p.2340-2352
- 图表：9 illus., 2 tables, 69 refs.
- 分类号：0802
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The Paleoproterozoic HP mafic granulite and calc-silicate were found from Laixi,Jiaobei terrane,consisting of almandine dominated garnet-augite-ferrohypersthene and grossular-zoisite-prehnite-albite respectively.Mineralogical and petrological studies show that the calc-silicate formed after the HP mafic granulite by processes combined retrogressive metamorphism with Ca alteration.The HP mafic granulites records four stage geological processes,including pre-granulite facies,peak granulite facies,retrogressive combined with Ca alteration and complete Ca alteration processes with mineral assemblages as Cpx + Pl + Qtz (M 1),Grt + Cpx + Rt + Qtz (M 2),Cpx + Pl + Opx + Ilm + Mgt + Ep (M 3) and Grs + Zo + Prh + Ab + Cal (M 4).The HP mafic granulite is rich in LIL elements Ba,Rb,K,Rb,Th and depleted in HFS elements Nb,Zr,Ti and Y,having LREE rich right-inclined REE pattern and showing island-arc basaltic characteristics.Further studies by using discrimination diagrams,the HP mafic granulite presents island-arc tholeiitic characteristics,probably formed in the back-arc extension tectonic setting.After formation of the mafic rock,it experienced granulitic facies metamorphism during collisional convergence of the Jiao-Liao-Ji orogenic belt and afterwards experienced retrogressive and Ca alteration processes during the lift of the belt.
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