Origin of the stratification of cratonic mantle lithosphere

Abstract

Compiled PTX diagram and trans-sects for sub-cratonic mantle lithosphere (SCLM) >of 150 kimberlitic pipes including those from Yakutia. Major regularities were determined for by the comparison of the PTX diagram for the subcratonic lithospheric mantle (SCLM) according to mantle xenoliths from large amount of the kimberlite pipes from N America Yakutia, Baltica , South and Central Africa. Proterozoic pipes from Africa like Premier Roberts Victor show in general higher heating degree which is visible especially by the by the high temperature PT subadiabatic arrays for SCLM beneath Premier from the deep level at 70 kbar (Fig. 1). The diamond inclusions and diamond eclogites from Roberts Victor support this thesis. (Fig 2). But common pipes beneath Kaapvaal craton refer to 40mw/m2 geotherm in the middle part and heating at 60 kbar and different PT paths for the mantle eclogites. Diamond inclusions reveal colder and deeper conditions and several PT paths.