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- W1985316100 abstract "Thirty-six kimberlitic diatremes and dikes occur in a north-south zone in the Precambrian core of the Colorado-Wyoming Front Range. A group of nineteen of apparent Middle Paleozoic age, near the state line, has been studied in detail. These pipes of intrusive breccia contain a varied assortment of nodular material, including spinel and garnet lherzolite, eclogite, distinctive carbonatite (sövite), and large megacrysts of orthopyroxene, garnet, ilmenite, and both chromian and non-chromian diopside. The upper mantle through which kimberlite rose is interpreted to have consisted of spinel peridotite from the base of the crust at 50 km to about 100 km and garnet peridotite below. Pockets of eclogite occurred at about 85–110 km. Chemistry of peridotites reflects partial melting before inclusion in kimberlite. A melt or melts of different chemical character, possibly cognate to kimberlite, has precipitated diopside, garnet and ilmenite." @default.
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- W1985316100 date "1975-01-01" @default.
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- W1985316100 title "Kimberlitic diatremes in northern Colorado and southern Wyoming" @default.
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- W1985316100 doi "https://doi.org/10.1016/0079-1946(75)90014-2" @default.
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