Weathering of Stone Mountain Granite

Cambridge University Press (CUP) - 1962
Willard H. Grant1
1Emory University, Atlanta, USA

Tóm tắt

AbstractThe weathering of Stone Mountain Granite (adamellite) forms kaolinite, endellite, allophane and gibbsite of which kaolinite is the most stable. Bulk density ranges from 2.65 in fresh rock to a minimum of 1.48 in saprolite. It is a good index of weathering. Abrasion pH ranges from 5.0 in saprolite to 9.3 in fresh rock, and is directly related to bulk density and the amount of clay mineral. Among the original minerals, biotite is least stable, followed by oligoclase. Residual microcline fragments occur at the base of the B horizon indicating that it is not completely weathered. Muscovite weathers slightly and quartz appears quite stable.Evidence shows that solution and reconstitution is necessary in the formation of some if not all clay minerals. This is particularly evident in the formation of endellite veins.Expansion of the rock in the early phases of weathering occurs but does not produce a significant increase in volume.

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Tài liệu tham khảo

10.2113/gsecongeo.44.2.110

Stevens, 1948, Simple field test for distinguishing minerals by abrasion pH, Amer. Min., 33, 31

10.1016/0016-7037(56)90009-6

LeGrand, 1958, Chemical character of water in the igneous and metamorphic rocks of North Carolina, Econ. Geol., 53, 178, 10.2113/gsecongeo.53.2.178

10.1086/623260

Sudo, 1956, Shapes of halloysite particles in Japanese clays, Clays and Clay Minerals, 356, 67

Grant, W. H. (1962) Field excursion, Stone Mountain Lithonia District: Guidebook No. 2, Georgia Dept. of Mines, Mining and Geology, 21 p.

10.1007/978-3-662-28818-4

Mindling, 1941, Climate of Georgia, 1941, 819

Sand, 1953, Mineralogy of the residual kaolins of the Southern Appalachians, Amer. Min., 38, 358

Hopson, 1954, Exfoliation and weathering at Stone Mountain, Georgia, Georgia Mineral Newsletter, 11, 65

10.1007/BF01772798

Kerr, 1948, Multiple differential thermal analysis, Amer. Min-, 33, 387

Herrmann, 1954, Geology of the Stone Mountain Lithonia District, Georgia Geol. Surv., Bull., 61, 139

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Cambridge University Press (CUP)

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