| 单词 | residual clay |
| 例句 | Deep residual clay soils derived from underlying limestones, and coloured red or black according to the predominance of oxides of iron or vegetable detritus, characterize the plains. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z Similar residual clays sometimes occur on the surface of areas of limestone in hollows and fissures formed by weathering. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" For instance, residual clays from the weathering of granite may be broadly contrasted with residual clays formed by the weathering of limestone, and both differ in group characteristics from clays in glacial deposits. The Economic Aspect of Geology The preglacial subsoils were residual clays and sands, composed of the insoluble elements of the country rock of the locality, with some minglings of its soluble parts still undissolved. The Elements of Geology In the weathering of rocks high in alumina, and low in iron minerals and quartz, deposits of residual clay or kaolin nearly free from iron oxide and quartz are formed. The Economic Aspect of Geology A limited amount of solution and redeposition of the barite takes place, however, resulting in its segregation into nodules in the residual clays. The Economic Aspect of Geology A combination of climatic, topographic, and other physiographic conditions may be used also in exploration for certain types of residual clays. The Economic Aspect of Geology In the Appalachian region of Tennessee, Alabama, and Georgia, bauxite occurs as pockets in residual clays above sedimentary rocks, chiefly above shales and dolomites. The Economic Aspect of Geology The rocks are covered with residual clays, the product of long preglacial weathering. The Elements of Geology In southwestern Wisconsin a reddish residual clay has an average depth of thirteen feet on broad uplands, where it has been removed to the least extent. The Elements of Geology Until rocks are reduced to residual clays the work of the weather is more rapid and effective on the fragments of the mantle of waste than on the rocks from which waste is being formed. The Elements of Geology By the removal of their soluble parts very many and widely different rocks rot down to a residual clay gritty with particles of quartz and colored red or yellow with iron oxide. The Elements of Geology To some extent also it is dissolved and reprecipitated, and is thus gathered into concretions and irregular nodular deposits in the residual clays. The Economic Aspect of Geology They dissolve and decompose under the chemical action of water and the various corrosive substances which it contains, leaving their insoluble residues as residual clays and sands upon the surface. The Elements of Geology In part it is derived from old residual clays, which in the making had been leached of the lime and other soluble ingredients of the rock from which they weathered. The Elements of Geology In many places the upper surface of the country rock beneath the drift has been swept clean of residual clays and other waste. The Elements of Geology Red residual clays accumulated on the mountain sides and upland summits, and were washed as ocherous silt to mingle with the delta sands. The Elements of Geology Weathering removes the more soluble materials and concentrates the lead sulphide with the residual clay and other gangue. The Economic Aspect of Geology |
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