Origin of the four mantle components
{"Image DocumentName": "Origin of the four mantle components", "Image ImageDescription": "EMI is problematic. All kinds of ideas are in play... It is close to Bulk Earth, except in eNd (but wait\u2026perhaps BSE does not have eNd = 0\u2026). Perhaps it is slightly modified BSE (modified how? Nobody says). It also resembles lower continental crust, from xenoliths and granulite terranes. Perhaps EMI and EMII are distinguished by intracontinental differentiation, and EMI is recycled by delamination whereas EMII is recycled by erosion and subduction. H2O-rich and CO2-rich fluids mobilize trace elements differently. It is possible that HIMU and EMI could be complementary products of migration of CO2-rich fluids from continental lithospheric mantle into lower continental crust. Another issue to revisit after we talk noble gases.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}