Transactions . I Hi. 2A.—h=Bante. l=^Giay. fine-drained \r ? rl* .j-^*^* Ilid^ren). Iliiorile re|)lacin<r limestone. FlorenceMine. Jiulith Mountains. f fliiorite; / limesfone; 7 secondaryjuartz. .Note how erv-stal boundaries .are prTlcci Iv deveiotHd on fluoriteand «nmrtz i . i Replacement Ore-Bodies—Irving 427 IV.—THE CRITERIA OF The recognition of an ore-body as the result of replacementmay be carried out by many different criteria. It rarely happensthat all of these criteria may be applied to a single deposit, butin most cases one or m
Transactions . I Hi. 2A.—h=Bante. l=^Giay. fine-drained \r ? rl* .j-^*^* Ilid^ren). Iliiorile re|)lacin<r limestone. FlorenceMine. Jiulith Mountains. f fliiorite; / limesfone; 7 secondaryjuartz. .Note how erv-stal boundaries .are prTlcci Iv deveiotHd on fluoriteand «nmrtz i . i Replacement Ore-Bodies—Irving 427 IV.—THE CRITERIA OF The recognition of an ore-body as the result of replacementmay be carried out by many different criteria. It rarely happensthat all of these criteria may be applied to a single deposit, butin most cases one or more of them will be available. Many of themmay be applied directly in the field, others require the use ofthe microscope. That the discussion which follows may be more easily under-stood the appended classification of criteria is given:— 1. Presence of complete Crystals in foreign Rock masses. 2. Preservation of Rock Structures. 3. Intersection of Rock Structures. 4. Absence of Concave Structures. 5. Absence of Crustification. 6. Presence of Unsupported Nu
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895
