Formation and evolution of flood basalt magmas – combining geochemical data with the magnetic stratigraphy of the Deccan large igneous province

德干洪水玄武岩的喷发代表了地球上最年轻的灾难性火山事件之一，德干火山喷发对环境的潜在影响一直存在争议。在厚约4 km的德干火山省，现代地球化学工作很少，因此大多数熔岩单元没有全面的地球化学数据集。主要由巴黎的法国科学家进行的古地磁研究，确立了德干洪水玄武岩的熔岩地层学和时间演化。我们从古磁钻岩芯中获得了158个岩石样本，我们想要对这些样本进行地球化学研究，以产生一个代表德干火山省约3.8公里的10个熔岩地层的数据集，包括主要元素和微量元素以及Sr-Nd-Hf-Pb同位素组成。在此基础上，我们拟确定不同熔岩单元的熔融过程和岩浆来源，以确定雷氏地幔柱、软流圈、次大陆岩石圈地幔和大陆地壳的输入。这些新数据将为该洪水玄武岩省形成过程中的地幔熔融、晶体分馏和同化过程提供重要的见解。

The eruption of the Deccan flood basalts represents one of the youngest catastrophic volcanic events on Earth and the potential environmental impact of the Deccan eruptions is debated. Little modern geochemical work has been carried out on the about 4 km thick Main Deccan Volcanic Province and thus no comprehensive geochemical data sets exist for most of the lava units. The paleomagnetic work mainly by French scientists from Paris have established the lava stratigraphy and temporal evolution of the Main Deccan flood basalts. We have obtained 158 rock samples from paleomagnetic drill cores that we want to study geochemically to produce a data set for ten lava formations representing about 3.8 km of the Main Deccan Volcanic Province including major and trace element as well as Sr-Nd-Hf-Pb isotope compositions. Based on this data set we intend to define melting processes and magma sources of the different lava units to define the input of the Réunion mantle plume, the asthenosphere, the subcontinental lithospheric mantle and the continental crust. The new data will provide important insight into mantle melting, crystal fractionation, and assimilation processes during formation of this flood basalt province.