Annual report . The chemicalcomposition of the rusty schists points to a sedimentary origin. Magnesian Limestone. The magnesian limestone is light brown in color andgranular. It occurs almost continuously along the base of the blue limestone and asremnants in the greywacke. 1913 The Pre=Cambrian Geology of Southeastern Ontario 93 An analysis by Mr. \Y. K. McNeill shows it to be an impure dolomite. Per cent. Insoluble Ferric oxide and alumina Lime Magnesia Loss on ignition This sample was taken from a point 200 feet northwest of No. 2 shaft on the CanadianSul
Annual report . The chemicalcomposition of the rusty schists points to a sedimentary origin. Magnesian Limestone. The magnesian limestone is light brown in color andgranular. It occurs almost continuously along the base of the blue limestone and asremnants in the greywacke. 1913 The Pre=Cambrian Geology of Southeastern Ontario 93 An analysis by Mr. \Y. K. McNeill shows it to be an impure dolomite. Per cent. Insoluble Ferric oxide and alumina Lime Magnesia Loss on ignition This sample was taken from a point 200 feet northwest of No. 2 shaft on the CanadianSulphur Ore Companys property. The insoluble material is chiefly silica. Blue Limestone.—In this area the blue limestone has nearly as great a volume asthe Keewatin. The rock is fine-grained and of a blue or drab color. Analyses show thatthe percentage of magnesia is very low. Interstratified with the limestone are thin layersof greywacke and fine-grained quartzite which give the appearance of original H»r. -ts. Photomicrograph t felsite at iron pyrites mine of Canadian Sulphur Ore Company, Queensboro. Crossed niCOis. The rock is greatly folded and contorted. The strikes and dips are recorded on themap. Around the workings on the Palmer, and in a few other places, the blue lime-stone is altered to white marble. Sonic of the iron pyrites on the Palmer property occursin the limestone near the greywacke. All of the Keewatin and Grenvllle rocks described are cut by acid and basicintrusives. POST-HASTINQS INTRUSH I S Felaite. A very Irregular, lens-shaped body of felsite occupies the central part ofthis area. It is very fine-grained, pink to grey in color, and resembles chert. Under themicroscope, however, it has an Igneous texture. An occasional small plagioclase pheno-cryst, Fig. 45, occurs in a very fine-grained groundmass of quartz and feldspar. Second-ary grains of magnetite are scattered through the rock. On the whole the f< is very fresh-looking and unalter
Size: 1578px × 1584px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
