R6: Plutonic rocks, volcanic rocks and subduction factory

[R6P-01] Sr-Nd isotope geochemical characteristics of meta-dolerite dykes from Western Dharwar craton and its geodynamic implications

*Silpa Ammini Sasidharan¹, Satish-Kumar M², Toshiro Takahashi² (1. Shimane Univ., 2. Niigata Univ. Sci.)

Keywords:Late Archean to Proterozoic, Mafic dyke swarms, Archean dynamics, Dharwar craton, SCLM

The early Earth dynamics including the cooling of mantle and the onset of plate tectonics that modified the composition of mantle through subduction is understood through the limited Archean record. Gradual destruction of the early formed crust at the convergent boundaries has significantly altered the composition of the primitive mantle from Late Archean to Proterozoic. However, periodic emplacement of mantle materials in the form of mafic dyke swarms into the Archean crust has since long survived and is exposed in the Precambrian terranes all over the world.