The oxygen isotopic composition of 6 xenoliths for which an origin between 310 to 450 km has been deduced was analyzed. An eclogite from Koidu, Sierra Leone, is composed of garnet with δ 18Ogt = 5.67‰ vs SMOW (standard ...
Carbon is the fourth most abundant element in the solar system. In the Earth carbon is in atmospheric CO2, limestone, other organic products, graphite and trace diamond; interstellar diamond, however, is ubiquitous. Diamond ...
Graphite-bearing peridotites, pyroxenites and eclogite xenoliths from the Kaapvaal craton of southern Africa and the Siberian craton, Russia, have been studied with the aim of: 1) better characterising the abundance and ...