. Transactions. in following the formation step by step. The iron deposits of class 2 originated through a magmatic dif-ferentiation process, that is, the various constituents of the magmaseparated to a large extent in special groups ; for instance, the Atikokandykes contained in their magma sulphide of iron, (2) magnetic iron, (3)silicate of magnesium and calcium, (4) silicate of aluminum and sodium,then No. i formed pyrrhotite. No. 2 magnetite. No. 3 hornblende. albite. Again Nos. 3 and 4 formed together to a rock as Gabbro,Nos. I and 2 separated into special minerals, or mixed mechanic
. Transactions. in following the formation step by step. The iron deposits of class 2 originated through a magmatic dif-ferentiation process, that is, the various constituents of the magmaseparated to a large extent in special groups ; for instance, the Atikokandykes contained in their magma sulphide of iron, (2) magnetic iron, (3)silicate of magnesium and calcium, (4) silicate of aluminum and sodium,then No. i formed pyrrhotite. No. 2 magnetite. No. 3 hornblende. albite. Again Nos. 3 and 4 formed together to a rock as Gabbro,Nos. I and 2 separated into special minerals, or mixed mechanicallywith the rock; now we see that this class is of volcanic origin, that itsconstituents form pockets, and lenses of all sizes, either mixed togetheror partly separated, in the manner represented in map No. 3. These dykesare of similar nature to the rocks in which pyrrhotite is mined in the Sud-bury country, with the only difference that the latter must have cooled )(, Map 1A. SS«. Sheets Plate I.—Illustrating paper by Mr. F. Hille, , On the Iron Ores of Western Ontario. rt Map Iron DepositsEast Side of Hunters Island 1^^ Coufchichiftg. LAUREHTIAN r^^^ Siotife-SrantteOhehs. c- I //-art & Jasper San^s.—— fnfer/iet/ona/ Boomfary.
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895
