Economic geology : bulletin of the society of economic geologists, Vol. 105 N° 3. Economic geology and the bulletin of the society of economic geologists - Mai 2010
| Titre : | Economic geology : bulletin of the society of economic geologists, Vol. 105 N° 3. Economic geology and the bulletin of the society of economic geologists - Mai 2010 |
| Type de document : | Bulletin |
| Paru le : | 07/09/2011 |
Dépouillements
Article : texte imprimé
Richard J. Goldfarb, Auteur ;
Dwight Bradley, Auteur ;
David L. Leach, Auteur
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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 stat[...]
Article : texte imprimé
Andrey Bekker, Auteur ;
John F. Slack, Auteur ;
Noah Planavsky, Auteur
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Iron formations are economically important sedimentary rocks that are most common in Precambrian sedimentary successions. Although many aspects of their origin remain unresolved, it is widely accepted that secular changes in the style of their d[...]
Article : texte imprimé
James Farquhar, Auteur ;
Nanping Wu, Auteur ;
Donald E. Canfield, Auteur
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Significant links exist between the sulfur cycle, sulfur geochemistry of sedimentary systems, and ore deposits over the course of Earth history. A picture emerges of an Archean and Paleoproterozoic stage of the sulfur cycle that has much lower l[...]
Article : texte imprimé
J. Barry Maynard, Auteur
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Almost all economic manganese ores are ultimately or directly derived from hydrothermal vents associated with intermediate volcanic rocks. This source is in contrast to deep-sea nodules, which likely have a larger component of sediment-derived m[...]
Article : texte imprimé
Michel Cuney, Auteur
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Uranium deposit types have evolved considerably from the Archean to the Present. The major global drivers were (1) change of geotectonic conditions during the Late Archean, (2) strong increase of atmospheric oxygen from 2.4 to 2.2 Ga, and (3) de[...]
Article : texte imprimé
David L. Huston, Auteur ;
Sally Pehrsson, Auteur ;
Bruce M. Eglington, Auteur
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Analysis of metallogenic data, including grade and tonnage, host-rock succession, ore and alteration mineralogy, and lead and sulfur isotope data, indicates significant secular changes in the character of volcanic-hosted massive sulfide (VHMS) d[...]
Article : texte imprimé
David L. Leach, Auteur ;
Dwight C. Bradley, Auteur ;
David Huston, Auteur
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Sediment-hosted Pb-Zn deposits can be divided into two major subtypes. The first subtype is clastic-dominated lead-zinc (CD Pb-Zn) ores, which are hosted in shale, sandstone, siltstone, or mixed clastic rocks, or occur as carbonate replacement, [...]
Article : texte imprimé
Murray W. Hitzman, Auteur ;
David Selley, Auteur ;
Stuart Bull, Auteur
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Sedimentary rock-hosted stratiform copper deposits form by movement of oxidized, copper-bearing fluids across a reduction front that results in the precipitation of copper sulfides. Large-scale production of such oxidized fluids, as well as the [...]
Article : texte imprimé
David I. Groves, Auteur ;
Frank P. Bierlein, Auteur ;
Lawrence D. Meinert, Auteur
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The iron oxide copper-gold (IOCG) group of deposits, initially defined following discovery of the giant Olympic Dam Cu-U-Au deposit, has progressively become too-embracing when associated deposits and potential end members or analogs are include[...]
Article : texte imprimé
Gregory J. Retallack, Auteur
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Laterites and bauxites are produced in tropical soils by weathering, which enriches iron (of laterites) and alumina (of bauxites)—as well as trace elements such as nickel, gold, phosphorus, and niobium—to ore grade. Laterites and bauxites can be[...]
Article : texte imprimé
A. J. Naldrett, Auteur
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Magmatic sulfide deposits are divisible into two major groups, those that are valued primarily for their Ni and Cu and that are mostly sulfide rich (> 10% sulfide), and those that are valued primarily for their PGE and tend to be sulfide poor ( [...]
Article : texte imprimé
J. J. Gurney, Auteur ;
H. H. Helmstaedt, Auteur ;
S. H. Richardson, Auteur
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Diamonds form in the upper mantle during episodic events and have been transported to the Earth’s surface from at least the Archean to the Phanerozoic. Small diamonds occur as inclusions in robust minerals in tectonically activated, ultrahigh-pr[...]
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