TERMIUM Plus^®

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Earth’s history from 543 million years (Ma) ago to today—the Phanerozoic Eon—is divided into three great eras: Paleozoic, Mesozoic, and Cenozoic.  2, fiche 1, Anglais, - million%20years

Fiche 1,  Justifications,  Français

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Le million d'années (Ma) et le millier d'années (Ka) sont des unités de temps couramment utilisées dans les sciences de la Terre.  3, fiche 1, Français, - million%20d%27ann%C3%A9es

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

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During the last ~28 m.y. a right-lateral transform margin ... progressively replaced the subduction margin so that currently most of western North America is placed against the Pacific plate along the Gulf of California-San Andreas-Queen Charlotte transform system. Only the relatively small Cascadia subduction zone is all that remains of the subduction margin.  2, fiche 2, Anglais, - right%2Dlateral%20transform%20margin

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right-lateral transform margin: term used at Natural Resources Canada - Earth Sciences Sector.  3, fiche 2, Anglais, - right%2Dlateral%20transform%20margin

Fiche 2,  Justifications,  Français

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marge de transformation dextre : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.  2, fiche 2, Français, - marge%20de%20transformation%20dextre

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Anglais

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A nine-point, Rb-Sr whole-rock isochron defines an age of 360 +/- 8 m.y. for the pluton (initial /sup 87/Sr//sup 86/Sr = 0.7056 +/- 3).  3, fiche 3, Anglais, - nine%2Dpoint%20Rb%2DSr%20isochron

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Holland and Lambert ... carried out Rb-Sr isotopic analyses on a set of 13 samples of pegmatite but the data do not form a single coherent isochron and are, therefore, difficult to interpret. A selected nine-point isochron implies a crystallisation age of 1663 [more or less] 22 Ma with an initial 87Sr/86Sr ratio of 0.705, coincident with that of the Tollie gneisses. ... Holland and Lambert considered that the scatter of points might be the product of an open isotopic system involving variable loss of 87Sr into the host gneisses. If this were the case and if there were no comparable loss of Rb, the upper boundary of the data spread (i.e. the nine-point 1663 Ma isochron) would be expected to give the closest approximation to the age.  4, fiche 3, Anglais, - nine%2Dpoint%20Rb%2DSr%20isochron

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nine-point Rb-Sr isochron: term used at Natural Resources Canada - Earth Sciences Sector.  5, fiche 3, Anglais, - nine%2Dpoint%20Rb%2DSr%20isochron

Fiche 3,  Justifications,  Français

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isochrone Rb-Sr à neuf points : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.  2, fiche 3, Français, - isochrone%20Rb%2DSr%20%C3%A0%20neuf%20points

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Fiche 4,  Justifications,  Anglais

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[A deposit] that occurs at or near unconformities.  2, fiche 4, Anglais, - unconformity%2Dassociated%20deposit

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Unconformity-associated uranium deposits typically consist of uranium concentrations at the unconformable base of Proterozoic sandstone where it is in contact with Middle Proterozoic metamorphic basement rocks ... Step faults or fracture zones are associated features. ... The unconformity-associated deposits are, in general, hosted by Proterozoic rocks. Their mineralization is epigenetic and formed, as a rule, during several periods.  4, fiche 4, Anglais, - unconformity%2Dassociated%20deposit

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Uranium. ... commercial grade concentrations occur mainly in rocks of pre-1,000 m.y. and post-230 m.y. age with rather limited resources between these ages. The older group includes several types of deposits including the conglomerate deposits of the Witwatersrand, South Africa and Elliot Lake, Canada ... and deposits associated with unconformities dating between 1,700 and 1,200 m.y.  5, fiche 4, Anglais, - unconformity%2Dassociated%20deposit

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... unconformity uranium deposits have some features in common with redbed-type copper deposits, but they were probably formed at different times, in different areas and from different ore fluids.  4, fiche 4, Anglais, - unconformity%2Dassociated%20deposit

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In unconformity-type uranium deposits part or most of the deposit may be in overlying continental sandstones.  4, fiche 4, Anglais, - unconformity%2Dassociated%20deposit

Fiche 4,  Justifications,  Français

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Minéralisation située au niveau ou à peu de distance d'une discordance.  1, fiche 4, Français, - gisement%20associ%C3%A9%20%C3%A0%20des%20discordances

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[...] les gîtes d'U-EGP-Au associés à des discordances [...]  1, fiche 4, Français, - gisement%20associ%C3%A9%20%C3%A0%20des%20discordances

Fiche 4,  Justifications,  Espagnol

Fiche 5,  Justifications,  Anglais

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A same designation could refer to a geographic or a geologic entity, sometimes with a slight variant in spelling or writing. It is important to distinguish one from the other and write each correctly according to the given context.  2, fiche 5, Anglais, - Bathurst%20fault

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Some of the major structures, such as the McDonald and Bathurst Fault zones, those near Lake Athabasca, and along the Slave-Churchill boundary, were initiated early, about: 1,700 to 1,760 m.y. ago before and during deposition of late Aphebian or early Paleohelikian red bed sequences.  3, fiche 5, Anglais, - Bathurst%20fault

Fiche 5,  Justifications,  Français

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La règle concernant la majuscule au générique d'un nom géologique demeure imprécise. Habituellement, les noms de divisions stratigraphiques portent la majuscule et les entités de moindre importance n'en portent pas.  2, fiche 5, Français, - faille%20de%20Bathurst

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Une même désignation peut se référer à une entité géographique et à une entité géologique, parfois avec une légère variante. Il importe de bien distinguer l'une de l'autre et d'utiliser la graphie correcte selon le contexte.  2, fiche 5, Français, - faille%20de%20Bathurst

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La formation de quelques structures majeures, telles que les zones de failles de McDonald et de Bathurst, celles près du lac Athabasca et le long de la limite entre les provinces des Esclaves et de Churchill, a débuté entre 1,700 et 1,760 m.a. ou avant et au cours de la mise en place des successions de couches rouges de la fin de l'Aphébien ou du Paléohélikien inférieur.  3, fiche 5, Français, - faille%20de%20Bathurst

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Fiche 6,  Justifications,  Anglais

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A same designation could refer to a geographic or a geologic entity, sometimes with a slight variant in spelling or writing. It is important to distinguish one from the other and write each correctly according to the given context.  2, fiche 6, Anglais, - Iron%20Mountain%20district

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In the Iron Mountain District of Michigan the major metamorphic event affecting Animikie rocks or their equivalents took place at about 1,900 m.y.  3, fiche 6, Anglais, - Iron%20Mountain%20district

Fiche 6,  Justifications,  Français

Record number: 6, Textual support number: 1 OBS

La règle concernant la majuscule au générique d'un nom géologique demeure imprécise. Habituellement, les noms de divisions stratigraphiques portent la majuscule et les entités de moindre importance n'en portent pas.  2, fiche 6, Français, - district%20d%27Iron%20Mountain

Record number: 6, Textual support number: 2 OBS

Une même désignation peut se référer à une entité géographique et à une entité géologique, parfois avec une légère variante. Il importe de bien distinguer l'une de l'autre et d'utiliser la graphie correcte selon le contexte.  2, fiche 6, Français, - district%20d%27Iron%20Mountain

Record number: 6, Textual support number: 3 OBS

Dans le district d'Iron Mountain, au Michigan, le principal phénomène métamorphique ayant affecté les roches du groupe d'Animikie ou leurs équivalents date d'environ 1,900 m.a.  3, fiche 6, Français, - district%20d%27Iron%20Mountain

Fiche 6,  Justifications,  Espagnol

Fiche 7,  Justifications,  Anglais

Record number: 7, Textual support number: 1 CONT

Today, over 90% of the iron ore supplied to steel mills, at least of the western world, is mined from bedded iron formations of Precambrian age, mainly deposited between 2,000 and 1,600 m.y. in North America, Brazil, Sweden, European USSR, and Western Australia, and various parts of western Africa.  1, fiche 7, Anglais, - bedded%20iron%20formation

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Fiche 7,  Justifications,  Espagnol