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Secular variation in economic geology / Richard J. Goldfarb in Economic geology, Vol. 105 N° 3 (Mai 2010) 

Public ISBD [article]  in Economic geology > Vol. 105 N° 3 (Mai 2010) . - pp. 459-465 Titre : Secular variation in economic geology Type de document : texte imprimé Auteurs : Richard J. Goldfarb, Auteur ; Dwight Bradley, Auteur ; David L. Leach, Auteur Année de publication : 2011 Article en page(s) : pp. 459-465 Note générale : Economic geology Langues : Anglais (eng) Mots-clés : Economic  geology  Secular  variation  Ores  Mineral  deposits Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : The temporal pattern of ore deposits on a constantly evolving Earth reflects the complex interplay between the evolving global tectonic regime, episodic mantle plume events, overall changes in global heat flow, atmospheric and oceanic redox states, and even singular impact and glaciation events. Within this framework, a particular ore deposit type will tend to have a time-bound nature. In other words, there are times in Earth history when particular deposit types are absent, times when these deposits are present but scarce, times when they are abundant, and still other times for which we lack sufficient data. Understanding of such secular variation provides a critical first-order tool for exploration targeting, because rocks that have formed or were deformed during a certain time slice may be very permissive for a given deposit type, whereas identification of rocks of less favorable ages would help eliminate large areas during exploration programs. Secular analysis, therefore, is potentially a powerful tool for mineral resource assessment in poorly known terranes, providing a quick filter for favorability of a given deposit type using age of host rocks. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/105/3/459.extract [article] Secular variation in economic geology [texte imprimé] / Richard J. Goldfarb, Auteur ; Dwight Bradley, Auteur ; David L. Leach, Auteur . - 2011 . - pp. 459-465. Economic geology Langues : Anglais (eng) in Economic geology > Vol. 105 N° 3 (Mai 2010) . - pp. 459-465 Mots-clés : Economic  geology  Secular  variation  Ores  Mineral  deposits Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : The temporal pattern of ore deposits on a constantly evolving Earth reflects the complex interplay between the evolving global tectonic regime, episodic mantle plume events, overall changes in global heat flow, atmospheric and oceanic redox states, and even singular impact and glaciation events. Within this framework, a particular ore deposit type will tend to have a time-bound nature. In other words, there are times in Earth history when particular deposit types are absent, times when these deposits are present but scarce, times when they are abundant, and still other times for which we lack sufficient data. Understanding of such secular variation provides a critical first-order tool for exploration targeting, because rocks that have formed or were deformed during a certain time slice may be very permissive for a given deposit type, whereas identification of rocks of less favorable ages would help eliminate large areas during exploration programs. Secular analysis, therefore, is potentially a powerful tool for mineral resource assessment in poorly known terranes, providing a quick filter for favorability of a given deposit type using age of host rocks. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/105/3/459.extract