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Charles Kenneth Leith - The Economic Aspect of Geology

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Charles Kenneth Leith The Economic Aspect of Geology

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THE ECONOMIC ASPECTS OF GEOLOGY
C. K. LEITH
UNIVERSITY OF WISCONSIN
deco
NEW YORK
HENRY HOLT AND COMPANY
Copyright , 1921
BY
HENRY HOLT AND COMPANY
August, 1923
PRINTED IN THE U. S. A.

CONTENTS
CHAPTERPAGE
INTRODUCTION1
Survey of Field
Economic applications of the several branches of geology and of other sciences
Mineralogy and petrology
Stratigraphy and paleontology
Structural geology
Physiography
Rock alterations or metamorphism
Application of other sciences
Treatment of the subject in this volume
THE COMMON ELEMENTS, MINERALS, AND ROCKS OF THE EARTH AND THEIR ORIGINS13
Relative abundance of the principal elements of the lithosphere
Relative abundance of the principal minerals of the lithosphere
Relative abundance of the principal rocks of the lithosphere
Water (hydrosphere)
Soils and clays
Comparison of lists of most abundant rocks and minerals with commercial rocks and minerals
The origin of common rocks and minerals
Igneous processes
Igneous after-effects
Weathering of igneous rocks and veins
Sedimentary processes
Weathering of sedimentary rocks
Consolidation, cementation, and other sub-surface alterations of rocks
Cementation
Dynamic and contact metamorphism
The metamorphic cycle as an aid in studying mineral deposits
SOME SALIENT FEATURES OF THE GEOLOGY AND CLASSIFICATION OF MINERAL DEPOSITS29
Various methods of classification
Names
Mineral deposits as magmatic segregations in igneous rocks
Mineral deposits within and adjacent to igneous rocks, which were formed immediately after the cooling and crystallization of the magmas through the agency of hot magmatic solutions
Evidence of igneous source
Possible influence of meteoric waters in deposition of ores of this class
Zonal arrangement of minerals related to igneous rocks
The relation of contact metamorphism to ore bodies of the foregoing class
Secondary concentration in place of the foregoing classes of mineral deposits through the agency of surface solutions
Residual mineral deposits formed by the weathering of igneous rocks in place
Mineral deposits formed directly as placers and sediments
Mechanically deposited minerals
Chemically and organically deposited minerals
Sedimentary mineral deposits which have required further concentration to make them commercially available
Anamorphism of mineral deposits
Conclusion
MINERAL RESOURCESSOME GENERAL QUANTITATIVE CONSIDERATIONS60
World annual production of minerals in short tons
World annual production of minerals in terms of value
Significance of geographic distribution of mineral production
The increasing rate of production
Capital value of world mineral reserves
Political and commercial control of mineral resources
Reserves of mineral resources
WATER AS A MINERAL RESOURCE67
General geologic relations
Distribution of underground water
Movement of underground water
Wells and springs
Composition of underground waters
Relation of geology to underground water supply
Surface water supplies
Underground and surface waters in relation to excavation and construction
THE COMMON ROCKS AND SOILS AS MINERAL RESOURCES80
Economic features of the common rocks
Granite
Basalt and related types
Limestone, marl, chalk
Marble
Sand, sandstone, quartzite (and quartz)
"Sand and gravel"
Clay, shale, slate
The feldspars
Hydraulic cement (including Portland, natural, and Puzzolan cements)
Geologic features of the common rocks
Building stone
Crushed stone
Stone for metallurgical purpposes
Clay
Limitations of geologic field in commercial investigation of common rocks
Soils as a mineral resource
Origin of soils
Composition of soils and plant growth
Use of geology in soil study
THE FERTILIZER GROUP OF MINERALS99
General comments
Nitrates
Economic features
Geologic features
Phosphates
Economic features
Geologic features
Pyrite
Economic features
Geologic features
Sulphur
Economic features
Geologic features
Potash
Economic features
Geologic features
THE ENERGY RESOURCESCOAL, OIL, GAS (AND ASPHALT)115
Coal
Economic features
World production and trade
Production in the United States
Coke
Classification of coals
Geologic features
Petroleum
Economic ffeatures
Production and reserves
Methods of estimating reserves
Classes of oils
Conservation of oil
Geologic features
Organic theory of origin
Effect of differential pressures and folding on oil genesis and migration
Inorganic theory of origin
Oil exploration
Oil shales
Natural gas
Economic features
Geologic features
Asphalt and bitumen
Economic features
Geologic features
MINERALS USED IN THE PRODUCTION OF IRON AND STEEL (THE FERRO-ALLOY GROUP)154
General features
Iron ores
Economic features
Technical and commercial factors determining use of iron ore materials
Geographic distribution of iron ore production
World reserves and future production of iron ore
Geologic features
Sedimentary iron ores
Iron ores associated with igneous rocks
Iron ores due to weathering of igneous rocks
Iron ores due to weathering of sulphide ores
Manganese ores
Economic features
Geologic features
Chrome (or chromite) ores
Economic features
Geologic features
Nickel ores
Economic features
Geologic features
Tungsten (wolfram) ores
Economic features
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