An Introduction to Economic Geology and Its Environmental by Anthony M. Evans

By Anthony M. Evans

Because it has grown in size and point via successive edtions, an analogous author's Introduction to Ore Geology (now Ore Geology and commercial Minerals) has left in the back of its unique viewers: first- and moment -ear scholars. This new textbook, designed to fill that area of interest , was once written in particular for introductory classes. Introduction to fiscal Geology and Its Environmental influence covers oil, coal, water and nuclear fuels, in addition to economically vital ores and bulk minerals. according to present issues and constraints, specific cognizance is paid to the effect of mining and drilling at the atmosphere

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Extra resources for An Introduction to Economic Geology and Its Environmental Impact

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Oxide ore minerals, such as chromite, often crystallize out early and thus may form good euhedral crystals, although these may be subsequently modified in various ways. Chromites deposited with interstitial silicate liquid may suffer corrosion and partial resorption to produce atoll textures (Fig. 1) and rounded grains, whereas those developed in monomineralic bands (see Fig. 2) may, during the cooling of a large parent intrusion, suffer auto-annealing and develop foam texture (the texture of polyhedral grain aggregates totally filling the space in which they occur).

G. limestone. Others, like some iron orebodies, are part of a stratigraphical succession which formed at the same time as the enclosing sediments and are therefore termed syngenetic deposits. Yet others, shaped like igneous dykes, cut across the enclosing rock, are clearly later in time and so are termed epigenetic. It is possible to classify orebodies in the same way as we divide up igneous intrusions according to whether they are discordant or concordant with the lithological banding (often bedding) in the enclosing rocks.

These bodies, called veins, are extensive in two dimensions, but have a restricted development in their third dimension. Veins are often inclined, and in such cases, as with faults, we can speak of the hanging wall and the footwall (Fig. 1). Veins frequently pinch and swell out as they are followed up or down a stratigraphical sequence. This pinch-and-swell structure can create difficulties during both exploration and mining often because only the swells are workable. Veins are usually developed in fracture systems and therefore show regularities in their orientation (Fig.

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