详细信息   

• 责任者：Tang Limei (Department of Earth Science ; Zhejiang University ; Hangzhou 310027 ; China) ; Chen Hanlin
• 刊名：Chinese Journal of Geology
• 出版年：2010
• 卷期：45(4)
• 关键词：中性岩 ; neutral rocks ; 基性岩 ; basic rocks ; 岩石地球化学 ; lithogeochemistry ; 海南 ; Hainan Province
• 页码：p.1139-1155
• 图表：8 illus., 3 tables, 47 refs.
• 分类号：0801
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

摘要

Gabbro is mostly partial melting of mantle rocks，the formation of mafic dykes and alkaline syenite are usually related with the extensional tectonics，the research on Triassic gabbro，mafic dykes and alkaline syenite in Hainan Island has important implications to its tectonic background. Systematic geochronology and geochemistry of gabbro and mafic dykes in Wanning and syenite in Fenjiezhou，Hainan Island，were done in this paper，and the tectonic significance was discussed. The result of LA-ICP-MS zircon U-Pb dating shows that the age of gabbro and mafic dykes is about 240 Ma，the age of syntite is about 231 Ma. The major element shows that gabbro and mafic dykes belong to alkaline series and subalkaline series，syenite in Fenjiezhou belongs to typical alkaline rocks.