. Transactions. Fig. 3. Fig. 4. Fig. 3.—Magnetite and Epidote near Orebody in East Mine, , Hornblende schist; ep, granular epidote.(Reproduced from Fig. 10, p. 80, of Dr. Spencers Report.)Fig. 4.—Section through Small Orebody in Northeast Mine of Juragua , Magnetite; b, selvage impregnated with chalocopyrite; c, white marble belongingto the schist series; d, fine-grained porphyry.(Reproduced from Fig. 11, p. 80, of Dr. Spencers Report.) rock called syenite by earlier writers is named by him quartz-diorite orsimply diorite; whereas the rock called diorite by earlier writers an
. Transactions. Fig. 3. Fig. 4. Fig. 3.—Magnetite and Epidote near Orebody in East Mine, , Hornblende schist; ep, granular epidote.(Reproduced from Fig. 10, p. 80, of Dr. Spencers Report.)Fig. 4.—Section through Small Orebody in Northeast Mine of Juragua , Magnetite; b, selvage impregnated with chalocopyrite; c, white marble belongingto the schist series; d, fine-grained porphyry.(Reproduced from Fig. 11, p. 80, of Dr. Spencers Report.) rock called syenite by earlier writers is named by him quartz-diorite orsimply diorite; whereas the rock called diorite by earlier writers andappearing as the wall rock of the ores is called by him porphyry. quartz-diorite or diorite must not be confounded with thediorite of the Fig. 5. Fig. 6. Fig. 5 (Fig. 12, idem).—Working Face of Lola Mine, showing General Rela-tions OF Orebody to Inclosing 6 (Fig. 13, idem).—Generalized Vertical Projection of Magdalena Ore-body AT Daiquiri to Illustrate Intrusion of Igneous Rock. So far as the sedimentary rocks and especially the limestones areconcerned, Dr. Kimball regarded them as coral reefs older than the modernreefs, but although no definite geological epoch is assigned to them,apparently in his view they grew in conditions not greatly changed fromthose of today except in the matter of subsidence. Professor Hill, 10 THE GEOLOGY OF IRON-ORE DEPOSITS , quoting two Spanish geologists, refers them to the Eocene-Oligocene, butDr. Spencer believes them older than the Oligocene because, on the northside of the Sierra Maestra, Oligocene fossiliferous strata rest upon thesame types of eruptives as appear on the south side and are later. must have supplied Professor Wedding with some sort of paleon-
Size: 2799px × 893px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
