Element profile and origin of the Romeu leucogranite pluton (NE Portugal) |
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Authors: | C M Wallfass |
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Institution: | (1) Present address: Institut für Mineralogie, Takustraße 6, 1000 Berlin 33, FRG |
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Abstract: | The Romeu Pluton (NE Portugal) comprises two principal leucogranite varieties: the Cernadela Granite, a biotite-bearing, slightly porphyritic leucogranite is crosscut by the Romeu Granite, a pure muscovite granite. The age of these granites is 296±7 Ma (87Sr/86Sr=0.727±0.006); the age difference between the two granites lies within the margin of error. Both granites are extremely enriched in Rb (Romeu Granite up to 1200 ppm) and strongly depleted in Sr (less than 5 ppm), Ba, Zr, Ti, La, Ce, and Th. Mild enrichment is shown by P, Sn, and U. The resulting element profile is very characteristic for these and other Iberian leucogranites. Although these granites show S-type characteristics, such as peraluminicity and a high initial Sr isotope ratio, the geochemical evidence supports an origin by fractionation of a granite magma.
Zusammenfassung Der Romeupluton (NE-Portugal) besteht hauptsächlich aus zwei Granitvarietäten, dem Cernadelagranit, einem biotithaltigen, leicht porphyrischen Leukogranit, der vom Romeugranit, einem reinen Leukogranit, durchschlagen wird. Das Alter des Plutons beträgt 296±7 Ma (87Sr/86Sr=0.727±0.006); der Altersunterschied zwischen beiden Granitvarietäten liegt innerhalb der Fehlergrenze. Beide Granite sind extrem an Rb (Romeutyp bis mehr als 1200 ppm) angereichert und stark an Sr (weniger als 5 ppm), Ba, Zr, Ti, La, Ce und Th abgereichert. Leichte Anreicherung zeigen P, Sn und U. Das resultierende Elementspektrum ist sehr charakteristisch für diese und andere iberische Leukogranite. Obwohl diese Granite S-Typ-Charakeristika wie Peraluminität und hohes initiales Sr-Isotopen-Verhältnis zeigen, lassen geochemische Befunde auf eine Genese durch Fraktionierung aus einem Granitmagma schließen.
Résumé Le pluton de Romeu (nord-est du Portugal) est composé de deux variétés principales de leucogranite: le granite de Cernadela, un leucogranite à biotite légèrement porphyrique, intrudé par le granite de Romeu, un leucogranite pur à muscovite. Le pluton est âgé de 296±7 Ma (rapport initial87Sr/86Sr de 0,727±0,006); la différence d'âge entre les deux variété de granite est inférieure à la marge d'erreur. Les deux granites sont extrêmement enrichis en Rb (le type Romeu de plus de 1.200 ppm) et fortement appauvris en Sr (moins que 5 ppm), Ba, Zr, Ti, La, Ce et Th. Le P, le Sn et l'U montrent un faible enrichissement. Le spectre des éléments qui en résulte est très caractéristique de ces granites, ainsi que d'autres leucogranites ibériques. Bien que ces granites présentent des caractéristiques de type S (peralumineux, rapport initial élevé), les résultats géochimiques indiquent une genèse par fractionnement d'un magma granitique.
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![tcy](/content/g87161785715145k/xxlarge1090.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) , ![lcy](/content/g87161785715145k/xxlarge1083.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) , ![tscy](/content/g87161785715145k/xxlarge1094.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) . ![Ncy](/content/g87161785715145k/xxlarge1053.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![zcy](/content/g87161785715145k/xxlarge1079.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![chcy](/content/g87161785715145k/xxlarge1095.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![lcy](/content/g87161785715145k/xxlarge1083.gif) ![softcy](/content/g87161785715145k/xxlarge1100.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![bcy](/content/g87161785715145k/xxlarge1073.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![gcy](/content/g87161785715145k/xxlarge1075.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![shchcy](/content/g87161785715145k/xxlarge1097.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![mcy](/content/g87161785715145k/xxlarge1084.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![chcy](/content/g87161785715145k/xxlarge1095.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![yucy](/content/g87161785715145k/xxlarge1102.gif) ![dcy](/content/g87161785715145k/xxlarge1076.gif) ![lcy](/content/g87161785715145k/xxlarge1083.gif) ![fcy](/content/g87161785715145k/xxlarge1092.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![scy](/content/g87161785715145k/xxlarge1089.gif) ![fcy](/content/g87161785715145k/xxlarge1092.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) , ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![lcy](/content/g87161785715145k/xxlarge1083.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![vcy](/content/g87161785715145k/xxlarge1074.gif) ![ucy](/content/g87161785715145k/xxlarge1091.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) . ![Ncy](/content/g87161785715145k/xxlarge1053.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![zcy](/content/g87161785715145k/xxlarge1079.gif) ![vcy](/content/g87161785715145k/xxlarge1074.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![pcy](/content/g87161785715145k/xxlarge1087.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![dcy](/content/g87161785715145k/xxlarge1076.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![lcy](/content/g87161785715145k/xxlarge1083.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![ecy](/content/g87161785715145k/xxlarge1101.gif) ![lcy](/content/g87161785715145k/xxlarge1083.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![mcy](/content/g87161785715145k/xxlarge1084.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![khcy](/content/g87161785715145k/xxlarge1093.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![kcy](/content/g87161785715145k/xxlarge1082.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![dcy](/content/g87161785715145k/xxlarge1076.gif) ![lcy](/content/g87161785715145k/xxlarge1083.gif) ![dcy](/content/g87161785715145k/xxlarge1076.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![ucy](/content/g87161785715145k/xxlarge1091.gif) ![gcy](/content/g87161785715145k/xxlarge1075.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![bcy](/content/g87161785715145k/xxlarge1073.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![jcy](/content/g87161785715145k/xxlarge1081.gif) ![scy](/content/g87161785715145k/xxlarge1089.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![lcy](/content/g87161785715145k/xxlarge1083.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![jcy](/content/g87161785715145k/xxlarge1081.gif) ![kcy](/content/g87161785715145k/xxlarge1082.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![gcy](/content/g87161785715145k/xxlarge1075.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) . ![KHcy](/content/g87161785715145k/xxlarge1061.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![ecy](/content/g87161785715145k/xxlarge1101.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![gcy](/content/g87161785715145k/xxlarge1075.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![pcy](/content/g87161785715145k/xxlarge1087.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![yacy](/content/g87161785715145k/xxlarge1103.gif) ![vcy](/content/g87161785715145k/xxlarge1074.gif) ![lcy](/content/g87161785715145k/xxlarge1083.gif) ![yacy](/content/g87161785715145k/xxlarge1103.gif) ![chcy](/content/g87161785715145k/xxlarge1095.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![pcy](/content/g87161785715145k/xxlarge1087.gif) S, ![kcy](/content/g87161785715145k/xxlarge1082.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![pcy](/content/g87161785715145k/xxlarge1087.gif) ., ![pcy](/content/g87161785715145k/xxlarge1087.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![gcy](/content/g87161785715145k/xxlarge1075.gif) ![lcy](/content/g87161785715145k/xxlarge1083.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![zcy](/content/g87161785715145k/xxlarge1079.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![mcy](/content/g87161785715145k/xxlarge1084.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![scy](/content/g87161785715145k/xxlarge1089.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![vcy](/content/g87161785715145k/xxlarge1074.gif) ![ycy](/content/g87161785715145k/xxlarge1099.gif) ![scy](/content/g87161785715145k/xxlarge1089.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![kcy](/content/g87161785715145k/xxlarge1082.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![scy](/content/g87161785715145k/xxlarge1089.gif) ![khcy](/content/g87161785715145k/xxlarge1093.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![dcy](/content/g87161785715145k/xxlarge1076.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![zcy](/content/g87161785715145k/xxlarge1079.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![chcy](/content/g87161785715145k/xxlarge1095.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![scy](/content/g87161785715145k/xxlarge1089.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![shcy](/content/g87161785715145k/xxlarge1096.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![zcy](/content/g87161785715145k/xxlarge1079.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![pcy](/content/g87161785715145k/xxlarge1087.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![scy](/content/g87161785715145k/xxlarge1089.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![tscy](/content/g87161785715145k/xxlarge1094.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) , ![pcy](/content/g87161785715145k/xxlarge1087.gif) ![lcy](/content/g87161785715145k/xxlarge1083.gif) ![ucy](/content/g87161785715145k/xxlarge1091.gif) ![chcy](/content/g87161785715145k/xxlarge1095.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![ycy](/content/g87161785715145k/xxlarge1099.gif) ![gcy](/content/g87161785715145k/xxlarge1075.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![khcy](/content/g87161785715145k/xxlarge1093.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![mcy](/content/g87161785715145k/xxlarge1084.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![chcy](/content/g87161785715145k/xxlarge1095.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![kcy](/content/g87161785715145k/xxlarge1082.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![dcy](/content/g87161785715145k/xxlarge1076.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![ycy](/content/g87161785715145k/xxlarge1099.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![zcy](/content/g87161785715145k/xxlarge1079.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![shcy](/content/g87161785715145k/xxlarge1096.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![yucy](/content/g87161785715145k/xxlarge1102.gif) ![scy](/content/g87161785715145k/xxlarge1089.gif) ![dcy](/content/g87161785715145k/xxlarge1076.gif) ![lcy](/content/g87161785715145k/xxlarge1083.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![vcy](/content/g87161785715145k/xxlarge1074.gif) ![ycy](/content/g87161785715145k/xxlarge1099.gif) ![vcy](/content/g87161785715145k/xxlarge1074.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![pcy](/content/g87161785715145k/xxlarge1087.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![tscy](/content/g87161785715145k/xxlarge1094.gif) ![iecy](/content/g87161785715145k/xxlarge1077.gif) ![scy](/content/g87161785715145k/xxlarge1089.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![fcy](/content/g87161785715145k/xxlarge1092.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![kcy](/content/g87161785715145k/xxlarge1082.gif) ![tscy](/content/g87161785715145k/xxlarge1094.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![vcy](/content/g87161785715145k/xxlarge1074.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![gcy](/content/g87161785715145k/xxlarge1075.gif) ![rcy](/content/g87161785715145k/xxlarge1088.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![icy](/content/g87161785715145k/xxlarge1080.gif) ![tcy](/content/g87161785715145k/xxlarge1090.gif) ![ncy](/content/g87161785715145k/xxlarge1085.gif) ![ocy](/content/g87161785715145k/xxlarge1086.gif) ![mcy](/content/g87161785715145k/xxlarge1084.gif) ![acy](/content/g87161785715145k/xxlarge1072.gif) ![gcy](/content/g87161785715145k/xxlarge1075.gif) ![mcy](/content/g87161785715145k/xxlarge1084.gif) .
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