EOSC 118 Lecture Notes - Lecture 10: Kimberlite, Lamproite, Craton
Document Summary
The origins and geology of diamonds and kimberlite. Primary deposits are found in volcanic rocks both on the surface and in unrupted magma that feed volcanoes. Volcanic rocks that host diamond are called kimberlie and lamproite. Secondary deposits include diamonds that have moved from the primary source and are now concentrated in a new location (usually rivers/currents do this). Diamond growth: diamond are stable at great depths below the surface with high pressures which is at least. 150km but the temperature in these regions is typically around 1500 degrees celsius which is too hot for diamond. Diamonds need temperatures between 900 1200 degree celsius: at the center of continents there are rocks called archean cratons. They are old (2. 5 billions years), cool where the great thickness push the keel down into the upper mantle (this is kinda like icebergs where only the tip shows).
