14-3-017: anorthosite - Stillwater District - Stillwater Mine

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Specimen Number14-3-017Alternate NumberSW-11BCommentsSample collected by Daven Mashburn. This and sample 14-3-019 are from a PGE cycle referred to as PCOA (plagioclase cumulate with oligocrysts of augite). Can run 200ppb Pt+Pd to 1opt Pt+Pd. Occurs above POC unit (sample SW-17). Sulfide content increases as grade increases. A norite cumulate that is not in collection typically overlies this PCOA sequence.In Teaching CollectionNoMineral(s)plagioclasepyroxeneRock NameanorthositeDistrictStillwaterMineStillwaterExternal LinkMindatGeo-LocationundefinedSub-LocationundefinedDeposit TypeLayered mafic intrusionGeo-Coords^[1]Reference MaterialACL-171: Gold, D.P., and Mueller, P., eds., 1979, Field Trip Guide to the Stillwater Layered Intrusive Complex, Montana; U.S. Nat'l. Comm. Arch. Geochem., 1979 Ann. Field Conf., Y.B.R.A. Camp, Red Lodge, Montana, August 12-18, 1979, 39 p.

ACL-172: Page, N.J., and Nokleberg, W.J., 1974, Geologic Map of the Stillwater Complex, Montana; Misc. Invest. Ser. Map I-797, Reston, VA.

ACL-225: Howland, A.L., 1955, Chromite Deposits in Central Part Stillwater Complex, Sweet Grass County, Montana; U.S. Geol. Surv. Bull. 1015-D, Washington, D.C., 26 p.

ACL-230: Mertie, J.B., 1969, Economic Geology of the Platinum Metals; U.S. Geol. Surv. Bull. 630, Washington, D.C., 120 p.

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14-3-017: anorthosite - Stillwater District - Stillwater Mine

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14-3-017: anorthosite - Stillwater District - Stillwater Mine