The Mother Lode region of California . DiAG»F\AN)s illusi:ratit9§-Moe-rrahsi-iioi9 fron^ jointingfoschistose stiuc-lures in the oreens-fones. Fig. 1. (2) Original minerals of the basic rocks, formed from a state of dry fusion ; e. g.,plagioclase, augite, olivine, etc. (3) Metamorphic minerals, formed as above exi)lained, from originals; e. g., horn-blende, albite, biotite, zoisite, garnet, staurolite, andalusite, etc. (4) Decomposition minerals; e. g., chlorite, quartz, carbonates, hydroxides, etc. * * I THE MOTHER LODE REGION—GENERAL GEOLOGY. 11 Rocks may be altered by simple pressure, but th
The Mother Lode region of California . DiAG»F\AN)s illusi:ratit9§-Moe-rrahsi-iioi9 fron^ jointingfoschistose stiuc-lures in the oreens-fones. Fig. 1. (2) Original minerals of the basic rocks, formed from a state of dry fusion ; e. g.,plagioclase, augite, olivine, etc. (3) Metamorphic minerals, formed as above exi)lained, from originals; e. g., horn-blende, albite, biotite, zoisite, garnet, staurolite, andalusite, etc. (4) Decomposition minerals; e. g., chlorite, quartz, carbonates, hydroxides, etc. * * I THE MOTHER LODE REGION—GENERAL GEOLOGY. 11 Rocks may be altered by simple pressure, but the accumulated strains which areLliierated within them are relieved and adjusted by overcoming the force of cohesionalong certain planes. Here there will be a shearing motion of greater or less extent,and a consequent crushing of the rock. The rent is soon healed by the crystallizationof new compounds which cement the crushed fragments, and in this way a schistoseband, of width varying with the intensity of the force, may be develo
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectminesandmineralresou
