Abstract

Abstact The Randolph Number One and Randolph Number Two bodies of ultramafic igneous rock, Riley County, Kansas have been identiSed as kimberlites based on their mineralogy and chemistry. Primary minerals consist of olivine, clinopyroxene, orthopyroxene, ilmenite, magnetite, calcite, apatite, and perovskite. The two bodies have the shape of pipes and both have been almost completely altered to serpentine and/or replaced by carbonate minerals. Numerous inclusions of locally derived sedimentary rocks occur with lesser amounts of fragments of igneous and metamorphic rocks. Two chemical analyses indicate that the pipes should be properly classified as micaceous kimberlites despite a low phlogopite content.

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