A Preliminary Report on a Part of the Granites and Gneisses of Georgia, Ausgabe 9,Teil 1G.W. Harrison, State printer, 1902 - 367 Seiten |
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Andere Ausgaben - Alle anzeigen
A Preliminary Report on a Part of the Granites and Gneisses of Georgia Thomas Leonard Watson Keine Leseprobe verfügbar - 2018 |
A Preliminary Report On a Part of the Granites and Gneisses of Georgia Thomas Leonard Watson Keine Leseprobe verfügbar - 2022 |
A Preliminary Report On a Part of the Granites and Gneisses of Georgia Thomas Leonard Watson Keine Leseprobe verfügbar - 2022 |
Häufige Begriffe und Wortgruppen
absorption abundant accessory acres albite allotriomorphic altered to chlorite Alumina apatite Atlanta belt biotite granite blue granite boulder outcrops Cao Magnesia cent chlorite cleavage coarse-grained color component minerals composed constituent contorted biotite granite-gneiss Coweta county crystals decayed rock DeKalb county east Elbert county Elberton epidote exposed exposure feet of stone feld feldspar and biotite feldspar species fine-grained folia fresh rock gneiss Granite Company's GRANITES AND GNEISSES granitic rocks groundmass hand specimen hornblende Ignition Total inclusions indicates intergrown interlocking Iron Sesqui-oxide kaolinization light-gray Lime Lithonia Magnesia magnetite mass medium-grained Meriwether county MgO Soda mica microcline microcline and plagioclase microscope muscovite Number of cubic numerous Oglesby Oglethorpe county opening orthoclase oxide percentage phenocrysts plagioclase plates porphyritic granite potash potash feldspars present quarry quarry is located quartz and feldspar residual rock Museum schistose shreds Silica structure surface texture thin section twinned wagon-road weathering yielded the writer zircon
Beliebte Passagen
Seite 238 - ... chemical work has been done upon the granites of North Carolina, but texturally and mineralogically, they correspond closely with the granites of Georgia and may be expected in a general way to conform chemically with the Georgia granites. Watson21 says of the Georgia granites. "Their (the granites) most distinguishing feature is their relatively high percentage of soda, which is above the average for normal granites. The soda and potash contents approximate nearly equal percentage amounts in...
Seite 125 - ... the edge of the woods, to the west of the dirt road, from which some material was quarried by the Southern railway, for culvert construction along its line. The rock is well adapted to monumental purposes and will prove an excellent stone for general construction work. THE LITHONIA AREA OF CONTORTED GRANITE-GNEISS In the immediate vicinity of Lithonia and to the north and east, are flat-surface exposures and unreduced residual boss-like masses of a highly contorted biotite granite-gneiss, the...
Seite 43 - The results thus far obtained are sufficient for us to formulate general rules, and the average results obtained are so vastly in excess of all ordinary requirements that they may safely be ignored. A stone so weak as to be likely to crush in the walls of a building, or even in a window stool, cap or pillar, bears so visible marks of its unfitness as to deceive no one with more than an extremely rudimentary knowledge on the subject.
Seite 61 - This metamorphism has induced a secondary foliation in the rocks, by arranging the mineral constituents along parallel lines, which evidently bear little or no relation to the possible original bedding planes in many of these rocks. The rocks consist principally of granites, gneisses and schists, cut by a series of younger basic eruptives, principally diabases and diorites.
Seite 322 - Microcline and orthoclase occur porphyritically developed, and measure 15 to 50"™ in length. The phenocrysts possessing idiomorphism usually display the Carlsbad habit of twinning, and are elongated in the clinopinacoidal direction. A thin section of one of the phenocrysts showed the characteristic microcline structure and numerous inclusions of quartz, biotite, and the groundmass feldspars, which measure as much as one millimeter in size. Prismatic crystals of apatite and zircon, as inclusions...
Seite 113 - ... the flat horizontal masses are known as "flat-rock," on account of the extent and nature of the outcrop. Cedars, mosses and lichens constitute the bulk of vegetation found covering the rock outcrops. HISTORY. — Among the first granite quarries opened up in the State were those at Stone Mountain. Records show that some rock was quarried from the somewhat disintegrated and decomposed ledges of the ridge as early as 1845 or 1850. The first systematic quarrying, however, was begun in 1869, when...
Seite 206 - ... open field. Microscopic study of a thin section from a specimen collected from this locality indicates the presence of the same minerals in the same relative proportions. The rock at this point has the same color and texture as that from the quarry. It is remarkably uniform, and in every respect an excellent stone for the various grades of work. It can be easily worked, and is within a short distance of the Seaboard Air Line railway. Tests made on specimens of rock collected from this locality...
Seite 293 - While occasionally observed by some investigators, the full significance of hydration, in its application to rock- weathering, has only recently been pointed out. It has long been known, that anhydrite (CaSO4), by the assumption of water (hydration), increases in volume ; thereby resulting in uplift, and, it may be, in crumpling and fracturing of the rocks, which overlie it. By comparing analyses of fresh and decayed rock, it will be foun d, that an increase in water invariably occurs. In rock decomposition,...
Seite 262 - ... out elsewhere in this report, the granite-gneisses represent unquestionable foliated phases of massive granites, similar to the present areas, but of an earlier period of intrusion. ROCK TYPES. — Mineralogically, the granites of Georgia are divisible into three leading types : ( 1) Biotite granite or granitite, under which head nearly all the granites of the State may be grouped ; (2) Muscovite-biotite granite; and (3) Biotite-bearing muscovite granite, of which the Stone Mountain granite is...
Seite 87 - Bulletin 9A Geological Survey of Georgia. ' The study was made in September, 1916. Number of cubic feet of stone contained in one ton (2,000 pounds) 11.9 Percentage (ratio) of absorption 0.067 "Crushing strength tests made on the granite, in two-inch cubes, gave the following results: Strength in Strength in pounds pounds per sq. in. Stone Mountain, Ga 85,000 21,250 Stone Mountain, Ga 50,325 12,581 Stone Mountain, Ga 48,760 12,190 Stone Mountain, Ga...