Geochemical Characteristics and Genesis of the High-Pressure Mafic Granulite in the Jiaobei High-Grade Metamorphic Basement, Eastern Shandong, China
详细信息
- 责任者：Liu Pinghua (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Liu Fulai
- 刊名：Acta Petrologica Sinica
- 出版年：2012
- 卷期：28(9)
- 关键词：麻粒岩 ; granulite ; 岩石地球化学 ; lithogeochemistry ; 山东 ; Shandong Province
- 页码：p.2705-2720
- 图表：7 illus., 2 tables, 67 refs.
- 分类号：0802
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The types of the high-pressure (HP) mafic granulites from high-grade metamorphic basement of the Jiaobei terrane are mainly composed of Grt mafic granulites, Grt-Hy granulites and Grt amphibolites. The HP mafic granulites are mainly occurred in TTG gneisses or granitic gneisses as enclaves or deformed dikes in the Jiaobei terrane. Mobile elements such as the large ion lithophile elements (K, Na, Sr, Rb) of the HP mafic granulites changed in significant levels, high field strength elements (Th, Nb, Zr, Ti) and rare earth elements basically unchanged and keep stable during the metamorphic process. The HP mafic granulites from the Jiaobei terrane. All most samples of the HP mafic granulites share obvious negative anomaly in Nb, Zr and Ti of the Phanerozoic island arc basalts, with the positive εNd(t) of (+2.70～+4.77). The composition of the major and trace elements of the HP mafic granulites in the Jiaobei terrane is characterized by the island arc tholeiitic basaltic rocks, and the protoliths may be gabbro instrusions or diabase dykes, and the corresponding basic volcanic rocks in back-carc extension tectonic setting.
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