New PDF release: Brines and Evaporites

By Peter Sonnenfeld

ISBN-10: 0875907075

ISBN-13: 9780875907079

ISBN-10: 1118667549

ISBN-13: 9781118667545

About The Product

Published through the yankee Geophysical Union as a part of the Short classes in Geology Series.

This direction is designed to provide primary techniques and constraints of evaporitic mineral precipitation in numerous depositional environments, a dialogue of the focus of attendant accent accumulations of clastics, base metals and hydrocarbons, an built-in evaluation of epigenetic alteration of evaporite deposits, and a scientific research of historical evaporite basin configurations.

These notes current case histories of present evaporite deposition within the wish that they're going to give you the keys to a greater realizing of historical salt basins.

The information awarded right here basically depend on basins studied through the writer and his coworkers. even though this selection might sound just a little constrained to a couple readers conversant in classical versions, the examples proven right here hide the most present-day geological settings. in addition, observations on pre-evaporitic deposits have been additionally brought.

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Extra resources for Brines and Evaporites

Example text

Both rubidiumand cesiumreplacement of potassium decreasewith temperatureand with a decreasingK/Mg ratio in the brine. Thallium occurs preferentially in sylvites witha TI/K rationear8 x 10'7 Seo lenium has not reported from evaporite minerals. 2 ppm in halite (probably as LiCI), up to 16 ppm in sylvite, and up to 8-9 ppm in carnallite. The Li-content of carnallite decreases with rising brine concentration. Bromide content Bromine does not form separate minerals in an evaporite sequence;it substitutes for chlorine in solid solution, but a sharp discontinuity in the Br/CI ratio occurs each time that the brine becomes saturated with respect to the mineral of next higher solubility.

All sebkhas are characterized by 1. a net dominance of detrital grains, 2. commonlya meagreamountof calcium and magnesiumcarbonates, 3. the coexistenceof salts precipitated in open water with salts of capillary evaporation in concentric arrangement of mineral species, 4. often a peculiar geochemistry of both clays and precipitates, 5. gypsumbeing absent in the open lagoon,but present under intertidal sediments or as groundwater-derived crusts. , aragonite, dolomite). tlsare commonaround ancient marine evaporites.

Proteins decomposefirst, leading to amino acid groups and eventually to nitrogen hydrides. Fatty acids are more resistant. The stripping of COO-radicals or decarboxylationis aided by the presenceof calcium or magnesiumhydroxides that then precipitate as calcite or magnesite respectively. Organic matter affects marine brine precipitates in many ways. Plaster derived from gypsum from modern salinas is slower in setting than that from quarried gypsum; it is more soluble because it still contains unflushed organic matter.

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Brines and Evaporites by Peter Sonnenfeld


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