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Proterozoic anorogenic magmatism in the Central Amazonian Province, amazonian araton: Geochronological, petrological and geochemical aspects

Proterozoischer, anorogener Magmatismus in der zentralen Amazonas-Provinz, Amazonas Kraton: Geochronologie, petrologische und geochemische Aspekte

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Summary

In the Central Amazonian Province, the anorogenic granites are older in the eastern block (1.88 Ga, U-Pb; 1.8 - 1.6 Ga Rb-Sr and K-Ar) and in the central block (1.75 -1.7 Ga, Rb-Sr) than in the western one (1.55 Ga, U-Pb). The country rocks are of Archaean age in the eastern block, and in the western block they are of Lower Proterozoic age (Trans-Amazonian Event). There is a minimum difference of 200 Ma between the last metamorphic event and the formation of the anorogenic granites. Metaluminous to peraluminous subsolvus granites are largely dominant but hypersolvus granites, sometimes peralkaline, as well as syenites and quartz-syenites also occur. Wiborgites and pyterlites are found only in the western block but rapakivi-like textures are described in the province as a whole. Mineralizations include large deposits of Sn, as well as small occurrences of F, Zr, REE, Y, and W. The granites are generally rich in Si, K, Fe, Zr, Ga, Nb, Y, and REE and show very high K/Na, Fe/(Fe + Mg) and Ga/Al2O3 ratios. They are geochemically similar to A-type and within-plate granites and more particularly to the Proterozoic rapakivi granites of the Fennoscandian shield and the metaluminous granites of the North American anorogenic province. Petrographic, geochemical and Sr isotopic data indicate crustal sources for the granite magmas. Differences in the sources should explain the contrast observed in some of the granites. The model of crustal anatexis induced by underplating or intrusion of mantle-derived basic magmas is preferred to explain the generation of the crustal granitic magmas.

Zusammenfassung

In der zentralen Amazonas-Provinz sind die anorogenen Granite im östlichen (1.88 Mia, U-Pb; 1.8-1.6 Mia, Rb-Sr und K-Ar) und im zentralen Block (1.75-1.7 Mia,Rb-Sr) älter als im westlichen Block (1.55 Mia, U-Pb). Die Nebengesteine sind im östlichen Block archaiischen Alters, während sie im westlichen Block im unteren Proterozoikum (Transamazonas Event) gebildet worden sind. Dies ergibt eine minimale Altersdifferenz von 200 Mio zwischen dem letzten metamorphen Ereignis und der Intrusion der anorogenen Granite. Es dominieren metaluminöse bis peraluminöse Subsolvus-Granite, jedoch treten auch Hypersolvus-Granite, stellenweise Peralkaline, wie auch Syenite und Quarz-Syenite auf. Wiborgite und Pyterlite kommen lediglich im westlichen Block vor, Rapakivi-ähnliche Texturen werden jedoch aus der gesamten Provinz beschrieben. An Mineralisationen treten große Sn-Lagerstätten und kleinere Vorkommen von F, Zr, SEE, Y und W auf. Die Granite sind generell reich an Si, K, Fe, Ga, Nb, Y und SEE und zeigen sehr hohe K/Na, Fe/(Fe + Mg) und Ga/Al2O3 Verhältnisse. Sie zeigen geochemische Ähnlichkeiten mit A-Typ und Intraplatten-Graniten, besonders jedoch mit den proterozoischen Rapakivi Graniten des fennoskandischen Schildes und mit den metaluminösen Graniten der nordamerikanischen anorogenen Provinz. Petrographische, geochemische und Sr-Isotopendaten deuten krustale Ausgangsgesteine der granitischen Magmen an. Unterschiede im Ausgangsmaterial sollen die verschiedenen Granittypen erklären. Als Modell für die Entstehung krustaler granitischer Magmen wird krustale Anatexis, hervorgerufen durch “underplating” oder Intrusion von aus dem Mantel stammenden, basischen Magmen angenommen.

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  1. M. J. B. Macambira

    Present address: Laboratoire de Géochimie Isotopique, Montpellier, France

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  1. Centro de Geociências-UFPA, Caixa Postal 1611, 66075-900, Belém, PA, Brazil

    R. Dall'Agnol, J. -M. Lafon & M. J. B. Macambira

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Dall'Agnol, R., Lafon, J.M. & Macambira, M.J.B. Proterozoic anorogenic magmatism in the Central Amazonian Province, amazonian araton: Geochronological, petrological and geochemical aspects. Mineralogy and Petrology 50, 113–138 (1994). https://doi.org/10.1007/BF01160143

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