欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
本文对四川冕宁地区的基性岩墙进行了年代学、岩石学和地球化学研究。主量元素特征和微量元素标准化图解显示，基性岩墙属于拉斑玄武岩系列，具有洋岛玄武岩（OIB）的特征，与峨眉山玄武岩为同源产物，存在密切的成因关系。微量元素示踪、Th／Hf-Ta／Hf判别图表明，冕宁基性岩墙具有地幔柱成因的特征，并遭受了轻微混染。基性岩墙锆石LA—ICP—MS测年结果表明，岩墙形成年龄为256．7±4．3Ma，表明岩墙是峨眉山大火成岩省大规模岩浆作用晚期的产物。年龄测定结果还暗示了岩墙在约244Ma遭遇了一次变质事件，可能是岩浆热一机械侵蚀作用，以及印支运动诱发岩浆作用再次活跃的结果。
英文摘要：
Geochronology, petrology and geochemistry were performed systematically on basic dykes in Mianning, Sichuan province. On the basis of major and trace elements patterns, basic dykes belong to tholeiitic basalt serie in lithology and have OIB （Ocean island basahs） features, which were homologous with Emeishan basalts. Trace elements tracing and Th/Hf--Ta/Hf identification diagram show that basic dykes were derived from mantle plume with little contamination. The LA-ICP-MS U-Pb zircon data of basic dyke yields a concordant age, 256.7±4.3Ma, which may represents the rock mass crystallization time. It shows that the Mianning basic dykes were formed in the late period of Emeishan mantle plume magmatism. In addition, the dating implies that dykes experienced geological events occurred about 244Ma, which was caused by thermal erosion of magma and triggered by the Indosinian movement.
同期刊论文项目
同项目期刊论文
Petrology and geochemistry of Permian mafic-ultramafic intrusions in the Emeishan large igneous prov
Geochronology and geochemistry of the Nantianwan mafic-ultramafic complex, Emeishan large igneous pr
A new metallogenic model of the Panzhihua giant V-Ti iron oxide deposit in the Emeishan large provin
Picritic porphyrites generated in a slab-window setting: Implications for the transition from Paleo-
Geochronology/geochemistry of the Washan dioritic porphyry associated with Kiruna-type iron ores, Mi
The role recycled oceanic crust in magmatism and metallogenesis: Os-Sr-Nd isotopes, U-Pb geochronolo
Noble gas isotopic systematics of Fe-Ti-V oxide ore-related mafic-ultramafic laered intrusions in th
A reappraisal of the high-Ti and low-Ti classification of basalts and petrogenetic linkage between b
Gushan magnetite-apatite deposit in the Ningwu basin, Lower Yangtze River, SE China: Hydrothermal or
Continental vertical growth in the transitional zone between south Tianshan and Tarim, western Xinji
Geochronology-geochemistry of the Cida bimodal intrusive complex, central Emeishan large igneous pro
Geochronology, geochemistry and petrogenesis of Neoproterozoic basalts from Sugetbrak, northwest Tar
Petrogenesis of early Cretaceous bimodal volcanic rocks in the Fanchang basin, SE China: an energy-c
Early Paleozoic tecnomic evolution of the south Tianshan collisional belt: Evidence from geochemistr
期刊信息
位置：