14-3-002: diabase - Stillwater District - Stillwater Mine

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Specimen Number14-3-002Alternate NumberSW-2ACommentsSample collected by Daven Mashburn. Precambrian Diabase dikes. Youngest igneous rock within Stillwater Complex. Diabase dikes cut lower portion of Stillwater, typically contain mineralized halos (Cu, Ni, Co) due to redistribution of sulfides during emplacement. Ophitic texture common with cpx and plagioclase. Age dated at 1.9 by.In Teaching CollectionNoMineral(s)plagioclasepyroxeneRock NamediabaseDistrictStillwaterMineStillwaterExternal 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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14-3-002: diabase - Stillwater District - Stillwater Mine