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Analyses of mineral inclusions, carbon isotopes, nitrogen contents and nitrogen aggregation states in 29 diamonds from two Buffalo Hills kimberlites in northern Alberta, Canada were conducted. From 25 inclusion bearing diamonds, the following paragenetic abundances were found: peridotitic (48%), eclogitic (32%), eclogitic/websteritic (8%), websteritic (4%), ultradeep? (4%) and unknown (4%). Diamonds...
A mineral inclusion, carbon isotope, nitrogen content, nitrogen aggregation state and morphological study of 576 microdiamonds from the DO27, A154, A21, A418, DO18, DD17 and Ranch Lake kimberlites at Lac de Gras, Slave Craton, was conducted. Mineral inclusion data show the diamonds are largely eclogitic (64%), followed by peridotitic (25%) and ultradeep (11%). The paragenetic abundances are similar...
A suite of diamonds from eastern Australia, ''Group B'', are essentially eclogitic. However, mineral inclusion compositions are unlike eclogitic diamonds from other occurrences. Garnets are very Ca-rich (Gr 61-84 ) and clinopyroxenes are mostly diopsidic (16+/-10 mol% Jd). Other inclusions in these diamonds are SiO 2 , titanite, olivine, molybdenite and melilite-a...
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