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Author | Journel*, A.G.; Huijbregts, C.J. | ||||
Title | Mining geostatistics | Type | Book Whole | ||
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1978 | Publication | Abbreviated Journal | ||
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Publisher | Academic Press London ; New York | Place of Publication | Editor | ||
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Series Volume | Series Issue | Edition | |||
ISSN | ISBN | 0123910501 | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | CUT @ phaedon.kyriakidis @ Journel1978 | Serial | 159 | ||
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Author | Wigley, T.M.L.; Plummer, L.N. | ||||
Title | Mixing of carbonate waters | Type | Journal Article | ||
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1976 | Publication | Geochimica et Cosmochimica Acta | Abbreviated Journal | |
Volume | 40 | Issue | 9 | Pages | 989-995 |
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Abstract | When mineral solutions of different compositions are mixed, the molalities and activities of individual ions in the mixture are often non-linear functions of their end-member values. This non-linearity is particularly significant in determining mineral saturation levels. Mixtures of saturated solutions may be either undersaturated or supersaturated depending on the end-member compositions and the physical conditions in which end-members and their mixtures exist. In carbonate solutions important non-linear effects occur due to redistribution of carbonate species. In extreme cases this causes mixture pH to be below both the end-member pH values. A simple but precise computer program (WATMIX) has been developed for calculating mixture composition for closed and open system mixing of arbitrary end-members. A number of mixing examples are considered which allow one to isolate three important processes leading to non-linear behaviour: the algebraic effect, the δPCO2 effect, and the ionic strength effect. | ||||
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ISSN | 0016-7037 | ISBN | Medium | ||
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Notes | Approved | no | |||
Call Number | THL @ christoph.kuells @ Wigley1976 | Serial | 40 | ||
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Author | Matheron*, G. | ||||
Title | The theory of regionalized variables and its applications | Type | Book Whole | ||
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1971 | Publication | Abbreviated Journal | ||
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Publisher | École national supérieure des mines | Place of Publication | Editor | ||
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Series Editor | Series Title | Centre de Morphologie Mathématique Fontainebleau: Les cahiers du Centre de Morphologie Mathématique de Fontainebleau | Abbreviated Series Title | ||
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Notes | Approved | no | |||
Call Number | CUT @ phaedon.kyriakidis @ Matheron1971 | Serial | 158 | ||
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Author | Krige*, D.G. | ||||
Title | A statistical approach to some basic mine valuation problems on the Witwatersrand | Type | Journal Article | ||
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1951 | Publication | Jour. Chem. Metall. and Mining Soc. So. Africa | Abbreviated Journal | |
Volume | 52 (6) | Issue | Pages | 119-139 | |
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ISSN | 0038-223x | ISBN | Medium | ||
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Notes | Approved | no | |||
Call Number | CUT @ phaedon.kyriakidis @ Krige1951 | Serial | 157 | ||
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Title | Type | Journal Article | |||
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Abstract | Throughout the Mediterranean, salinization threatens water quality, especially in coastal areas. This salinization is the result of concomitant processes related to both seawater intrusion and water–rock interaction, which in some cases are virtually indistinguishable. In the Nurra region of northwestern Sardinia, recent salinization related to marine water intrusion has been caused by aquifer exploitation. However, the geology of this region records a long history from the Palaeozoic to the Quaternary, and is structurally complex and comprises a wide variety of lithologies, including Triassic evaporites. Determining the origin of the saline component of the Jurassic and Triassic aquifers in the Nurra region may provide a useful and more general model for salinization processes in the Mediterranean area, where the occurrence of evaporitic rocks in coastal aquifers is a common feature. In addition, due to intensive human activity and recent climatic change, the Nurra has become vulnerable to desertification and, in common with other Mediterranean islands, surface water resources periodically suffer from severe shortages. With this in mind, we report new data regarding brackish and surface waters (outcrop and lake samples) of the Na-Cl type from the Nurra region, including major ions and selected trace elements (B, Br, I, and Sr), in addition to isotopic data including δ18O, δD in water, and δ34S and δ18O in dissolved SO4. To identify the origin of the salinity more precisely, we also analysed the mineralogical and isotopic composition of Triassic evaporites. The brackish waters have Cl contents of up to 2025 mg L−1 , and the ratios between dissolved ions and Cl, with the exception of the Br / Cl ratio, are not those expected on the basis of simple mixing between rainwater and seawater. The δ18O and δD data indicate that most of the waters fall between the regional meteoric water line and the global meteoric water line, supporting the conclusion that they are meteoric in origin. A significant consequence of the meteoric origin of the Na-Cl-type water studied here is that the Br / Cl ratio, extensively used to assess the origin of salinity in fresh water, should be used with care in carbonate aquifers that are near the coast. Overall, δ34S and δ18O levels in dissolved SO4 suggest that water–rock interaction is responsible for the Na-Cl brackish composition of the water hosted by the Jurassic and Triassic aquifers of the Nurra, and this is consistent with the geology and lithological features of the study area. Evaporite dissolution may also explain the high Cl content, as halite was detected within the gypsum deposits. Finally, these Na-Cl brackish waters are undersaturated with respect to the more soluble salts, implying that in a climate evolving toward semi-arid conditions, the salinization process could intensify dramatically in the near future. | ||||
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Notes | Approved | no | |||
Call Number | THL @ christoph.kuells @ | Serial | 80 | ||
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