金伯利岩
地质学
橄榄岩
地球化学
共生
克拉通
地幔(地质学)
橄榄石
铬铁矿
榴辉岩
钻石
岩石圈
捕虏体
古生物学
变质岩
俯冲
化学
有机化学
构造学
摘要
Murowa kimberlites are situated in the 3.5 Ga Tokwe block, the oldest part of the Zimbabwe craton. The diamonds are predominantly white or pale brown octahedra of high gem quality. Mineral inclusions are overwhelmingly peridotitic, dominated by chromite, sulfide, and olivine, with only minor amounts of orthopyroxene and garnet, suggestive of a very depleted lithospheric peridotite mantle host. Carbon isotope values for the diamonds range from δ13C –5.8 to –2.5‰ and are consistent with global peridotitic diamond signatures. Diamonds with an eclogitic paragenesis are virtually absent.
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