@article {683,
	title = {Subducting oceanic crust: The source of deep diamonds},
	journal = {Geology},
	volume = {33},
	year = {2005},
	note = {938hnTimes Cited:65Cited References Count:26},
	month = {Jul},
	pages = {565-568},
	abstract = {Inclusions of majoritic garnet in diamonds from the Jagersfontein kimberlite formed at unusually great depths of similar to 250 to > 500 km in the asthenosphere and transition zone. The original host rocks were derived from a much shallower, basaltic (eclogitic) source. The presence of negative Eu anomalies in all majoritic garnets requires a crustal origin, thereby linking these very deep diamond sources to subducting oceanic crust. The carbon isotope values (delta(13)C) of the host diamonds fall within a narrow range at similar to -20\%, which is fundamentally different from the broad range (-24\% to -2\%) and bimodal distribution of carbon isotopes of Jagersfontein diamonds that formed in the shallower lithosphere. This indicates that majoritic garnet-bearing diamonds at Jagersfontein inherited their light carbon isotopic composition directly from organic matter contained in a subducting slab. These diamonds were likely formed by direct conversion from graphite, well within the diamond stability field.},
	issn = {0091-7613},
	doi = {10.1130/G21637.1},
	author = {Tappert, R. and Stachel, T. and Harris, J. W. and Muehlenbachs, K. and Ludwig, T. and Brey, G. P.}
}
