Transcription of Opaque mineralogy and mafic mineral chemistry of I- and S ...
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Opaque mineralogy and mafic mineral chemistry of I- and S ...
American Mineralogist, Volume 73, pages 281-296, 1988 Opaque mineralogy and mafic mineral chemistry of I- and S-type granites of theLachlan fold belt. southeast Australia*Josnpn B. Wrrer,nNGeological Survey of Canada,60l Booth Street, Ottawa, Ontario KIA 0E8, CanadaBnucn W. Crrappnr,r,Department of Geology, The Australian National University, Box 4, Canberra, 2600, AustraliaAnstnacrAbout one-quarter or 44000 km'z of the Lachlan fold belt of southeast Australia isunderlain by granite batholiths of Silurian-Devonian age. Recent work has recognized amajor distinction between granites formed from igneous sources (I-type) and those formedfrom sedimentary sources (S-type). Lachlan I- and S-type granites are generally character-ized by the Opaque mineral assemblages magnetite + ilmenite f minor sulfide (pyrite >chalcopyrite > pyrrhotite) and ilmenite * sulfide (pyrrhotite > pyrite > chalcopyrite),respectively.
282 WHALEN AND CHAPPELL: ACCESSORY MINERALS IN I- AND S-TYPE GRANITES Fig. l. Location ofdiferent I- and S-type granitoid suites and opaque mineral samples (I-type : filled triangles; S-type filled circles) in part of the l,achlan fold belt.
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