The relation between iron-formation and low temperature hydrothermal alteration in an Archean volcanic environment

Chown, E. H.; N'Dah, Ehouman; Mueller, W.U.

doi:10.1016/s0301-9268(99)00091-1

Cited by 31 publications

(23 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In contrast, iron formations interlayered with volcanic rocks can be found in most greenstone belts. In several cases, a direct genetic relationship has been observed between volcanic activity and the deposition of iron formation, reflecting volcanic and hydrothermal activity both proximal and distal to volcanic centers (Fyon et al, 1992;Chown et al, 2000).…”

Section: Mesoarchean To Neoarchean Bifsmentioning

confidence: 99%

Iron Formation: The Sedimentary Product of a Complex Interplay among Mantle, Tectonic, Oceanic, and Biospheric Processes

Bekker¹,

Krapež²,

Slack³

et al. 2010

Economic Geology

836

494

View full text Add to dashboard Cite

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 deposition are linked to environmental and geochemical evolution of Earth. Two types of Precambrian iron formations have been recognized with respect to their depositional setting. Algoma-type iron formations are interlayered with or stratigraphically linked to submarine-emplaced volcanic rocks in greenstone belts and, in some cases, with volcanogenic massive sulfide (VMS) deposits. In contrast, larger Superior-type iron formations are developed in passive-margin sedimentary rock successions and generally lack direct relationships with volcanic rocks. The early distinction made between these two iron-formation types, although mimimized by later studies, remains a valid first approximation. Texturally, iron formations were also divided into two groups. Banded iron formation (BIF) is dominant in Archean to earliest Paleoproterozoic successions, whereas granular iron formation (GIF) is much more common in Paleoproterozoic successions. Secular changes in the style of iron-formation deposition, identified more than 20 years ago, have been linked to diverse environmental changes. Geochronologic studies emphasize the episodic nature of the deposition of giant iron formations, as they are coeval with, and genetically linked to, time periods when large igneous provinces (LIPs) were emplaced. Superior-type iron formation first appeared at ca. 2.6 Ga, when construction of large continents changed the heat flux at the core-mantle boundary. From ca. 2.6 to ca. 2.4 Ga, global mafic magmatism culminated in the deposition of giant Superior-type BIF in South Africa, Australia, Brazil, Russia, and Ukraine. The younger BIFs in this age range were deposited during the early stage of a shift from reducing to oxidizing conditions in the ocean-atmosphere system. Counterintuitively, enhanced magmatism at 2.50 to 2.45 Ga may have triggered atmospheric oxidation. After the rise of atmospheric oxygen during the GOE at ca. 2.4 Ga, GIF became abundant in the rock record, compared to the predominance of BIF prior to the Great Oxidation Event (GOE). Iron formations generally disappeared at ca. 1.85 Ga, reappearing at the end of the Neoproterozoic, again tied to periods of intense magmatic activity and also, in this case, to global glaciations, the so-called Snowball Earth events. By the Phanerozoic, marine iron deposition was restricted to local areas of closed to semiclosed basins, where volcanic and hydrothermal activity was extensive (e.g., backarc basins), with ironstones additionally being linked to periods of intense magmatic activity and ocean anoxia.Late Paleoproterozoic iron formations and Paleozoic ironstones were deposited at the redoxcline where biological and nonbiological oxidation occurred. In contrast, older iron formations were deposited in anoxic oceans, where ferrous iron oxid...

show abstract

Section: Mesoarchean To Neoarchean Bifsmentioning

confidence: 99%

Iron Formation: The Sedimentary Product of a Complex Interplay among Mantle, Tectonic, Oceanic, and Biospheric Processes

Bekker¹,

Krapež²,

Slack³

et al. 2010

Economic Geology

836

494

View full text Add to dashboard Cite

show abstract

“…The volcanic components typically consist of mafic-ultramafic or bimodal volcanic rocks that erupted in relatively deep-water, oceanic settings. In several cases, a direct genetic relationship has been documented between volcanic activity and deposition of IF, reflecting volcanic and hydrothermal activity both proximal and distal to volcanic centers (Chown et al, 2000;Fyon et al, 1992).…”

Section: Neoarchean To Mesoarchean Ifsmentioning

confidence: 99%

Iron Formations: Their Origins and Implications for Ancient Seawater Chemistry

Bekker

Planavsky

Rasmussen

et al. 2014

Treatise on Geochemistry

153

158

View full text Add to dashboard Cite

“…De plus, selon James (1954) ils représenteraient le faciès oxydé (Fyon et al, 1992;Chown et al, 2000). Selon…”

Section: Interprétation Des Formations De Fer Rubanéesunclassified

“…Dimroth ( internes des formations de fer rubanées sont semblables à ceux des tufs turbiditiques (Chown et al, 2000).…”

Section: Interprétation Des Formations De Fer Rubanéesunclassified

See 1 more Smart Citation

Étude volcano-sédimentaire de la zone de transition sommitale du Groupe de Hunter Mine et de la partie basale du Groupe de Stoughton-Roquemaure Abitibi Québec

Caron¹

2000

View full text Add to dashboard Cite

IV REMERCIEMENTSJe voudrais tout d'abord remercier ma famille pour leur soutient moral au cours de ce projet de maîtrise. Il est également important de souligner le soutient financier de Noranda Exploration sans quoi ce projet n'aurait put être réalisé. De plus, il m'aurait été impossible de mettre à terme ce mémoire sans la confiance, la patience et l'intérêt porté à ce projet de mon directeur de recherche, M. Wulf Mueller (UQAC) Franklin, 1987;Franklin, 1990). Tableau 9 : Dépôts associés aux principaux faciès volcaniques des 161 Centres éruptifs des volcans composites sous-marins. (Modifié de Easton et Johns, 1986). , 1980;Dimroth et al., 1982;Dimroth et al., 1985). Cet intérêt s'est accru au cours des dernières années puisque le nombre de découvertes de gîtes importants près de la surface a fortement diminué (Mueller, 1994). Conséquemment, une meilleure compréhension des environnements de formation des roches hôtes associées aux gisements est critique particulièrement à l'égard des gisements de sulfures volcanogènes. En effet, ce type de minéralisation est communément associé aux séquences pyroclastiques et volcanoclastiques marines. C'est pour ces diverses raisons que ce mémoire a été fait dans la zone de transition (Mueller, 1994).. 22 LISTE DES FIGURES Analogues modernes et caractéristiques généralesLes analogues modernes des édifices volcaniques abitibiens se trouvent entre 500 et 3500 m de profondeur dans les bassins arrière-arc ou aux arcs de Izu-Bonin (Smith et al., 1990) (Mueller, 1994). La signature géochimique de ces édifices est beaucoup plus variée que celle des dorsales médio-océanique à l'exception de l'Islande où il y a convergence du volcanisme de dorsale médio-océanique avec un volcanisme de point chaud (Mueller, 1994).La localisation des édifices volcaniques reliés aux arcs modernes est contrôlée par la géométrie de l'arc et par les structures en extension associées, qui sont communément en échelons. Les structures en extension, comme les failles synvolcaniques, favorisent la montée du magma. Les "zones de transfert" ou "d'accommodation" adjacentes aux arcs insulaires comme celui d'Izu-Bonin entre les îles de Simisu Sud et de Kotori, représentent un lieu de changement du comportement structural. Ces zones de transfert peuvent également être des foyers de formation des édifices volcaniques (Taylor et al., 1990;Mueller, 1994). ObjectifsLe but principal de ce projet de maîtrise est de déterminer la paléogéographie de la zone de transition du Groupe de Hunter Mine en caractérisant les volcanites hôtes qui sont associées aux indices de sulfures massifs volcanogènes de type Mattabi et aux formations de fer rubanées. Pour parvenir à déterminer la paléogéographie, il sera important de procéder par des objectifs spécifiques tels que : A) -la définition du contexte géologique en utilisant la volcanologie et la sédimentologie physique ; B) -la détermination des processus de formation des volcanites à l'aide de travaux de terrain et de laboratoire tels que; 1) la cartographie des zones d...

show abstract

The relation between iron-formation and low temperature hydrothermal alteration in an Archean volcanic environment

Cited by 31 publications

References 23 publications

Iron Formation: The Sedimentary Product of a Complex Interplay among Mantle, Tectonic, Oceanic, and Biospheric Processes

Iron Formation: The Sedimentary Product of a Complex Interplay among Mantle, Tectonic, Oceanic, and Biospheric Processes

Iron Formations: Their Origins and Implications for Ancient Seawater Chemistry

Étude volcano-sédimentaire de la zone de transition sommitale du Groupe de Hunter Mine et de la partie basale du Groupe de Stoughton-Roquemaure Abitibi Québec

Contact Info

Product

Resources

About