Herkunft der allerödzeitlichen Bimstuffe des Laacher Vulkangebietes |
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Authors: | Prof Dr Josef Frechen |
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Institution: | (1) Present address: Mineralogisch-Petrologisches Institut der UniversitÄt, Poppelsdorfer Schlo\, D-5300 Bonn 1 |
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Abstract: | Zusammenfassung Regionale Unterschiede der Schichtenabfolge, Schichtausbildung und Xenolithführung zeigen an, da\ die Tuffe der allerödzeitlichen Laacher Bimsdecke an mehreren Stellen gefördert worden sind. Isopachen- und Isoplethendarstellungen und die Xenolithassoziationen ermöglichen es, die Ausbruchsstellen zu lokalisieren. Danach fanden im Laacher See Gebiet wÄhrend des Alleröd in verhÄltnismÄ\ig kurzer Folge Bimsausbrüche statt bei Obermendig, im Meerboden, bei Frauenkirch, zwischen dem Wingertsberg und Thelenberg und im nordöstlichen Teil des Laacher Kessels. Die Ausbruchsstelle im Laacher Kessel ist durch eine ausgedehnte positive geomagnetische Anomalie gekennzeichnet. Die petrographische Zusammensetzung der Basaltauswürflinge in den Laacher See Tuffen gibt Hinweise auf das Alter des Laacher Kessels und auf die Magmendifferentiation in seinem Untergrund.
Regional differences in the sequence and structure of pumice beds, variation of basaltic and sedimentary xenoliths, isopachs and isopleths indicate, that the pumice tuffs of Alleröd age of the Laacher See area were erupted from different places: near Obermendig, in the Meerboden depression, near Frauenkirch, between Wingertsberg and Thelenberg, and in the northern part of the Laacher See basin. The eruption center in the Laacher See basin is marked by a large positive geomagnetic anomaly. Basaltic xenoliths of various composition occurring in the Laacher See pumice tuffs give evidence of an older volcanic phase in the Laacher See basin and of subvolcanic evolution of basaltic magma.
Résumé Les différences régionales dans la séquence stratigraphique, la structure des couches et les variations de leurs xénolithes montrent que les tufs allerödiens du Laacher See proviennent de plusieurs centres d'éruption. Les cartes d'isopaques et d'isoplèthes, ainsi que l'association des différents xénolithes, permettent de localiser ces centres dans la région du Laacher See, près d'Obermendig, dans le Meerboden, à Frauenkirch, entre le Wingertsberg et le Thelenberg et dans la partie nordest du bassin du Laacher See lui-mÊme. Ce dernier lieu est caractérisé par une large anomalie géomagnétique positive. La composition pétrographique des xénolithes basaltiques dans les tufs donne des indications sur l'âge du bassin de Laach et sur les processus de differentiation magmatique dans le soubassement.
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![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![zhcy](/content/t6xr42804q78040l/xxlarge1078.gif) ![Vcy](/content/t6xr42804q78040l/xxlarge1042.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Rcy](/content/t6xr42804q78040l/xxlarge1056.gif) ![zhcy](/content/t6xr42804q78040l/xxlarge1078.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Ncy](/content/t6xr42804q78040l/xxlarge1053.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![pcy](/content/t6xr42804q78040l/xxlarge1087.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Mcy](/content/t6xr42804q78040l/xxlarge1052.gif) ![zhcy](/content/t6xr42804q78040l/xxlarge1078.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![Bcy](/content/t6xr42804q78040l/xxlarge1041.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Rcy](/content/t6xr42804q78040l/xxlarge1056.gif) ![Mcy](/content/t6xr42804q78040l/xxlarge1052.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) 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![tcy](/content/t6xr42804q78040l/xxlarge1090.gif) , ![Fcy](/content/t6xr42804q78040l/xxlarge1060.gif) ![Rcy](/content/t6xr42804q78040l/xxlarge1056.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) ![Ucy](/content/t6xr42804q78040l/xxlarge1059.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Ncy](/content/t6xr42804q78040l/xxlarge1053.gif) ![kcy](/content/t6xr42804q78040l/xxlarge1082.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![Rcy](/content/t6xr42804q78040l/xxlarge1056.gif) ![khcy](/content/t6xr42804q78040l/xxlarge1093.gif) , ![Mcy](/content/t6xr42804q78040l/xxlarge1052.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![zhcy](/content/t6xr42804q78040l/xxlarge1078.gif) ![Dcy](/content/t6xr42804q78040l/xxlarge1044.gif) ![Vcy](/content/t6xr42804q78040l/xxlarge1042.gif) ![Ncy](/content/t6xr42804q78040l/xxlarge1053.gif) ![gcy](/content/t6xr42804q78040l/xxlarge1075.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) 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![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Vcy](/content/t6xr42804q78040l/xxlarge1042.gif) ![Rcy](/content/t6xr42804q78040l/xxlarge1056.gif) ![Ncy](/content/t6xr42804q78040l/xxlarge1053.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![CHcy](/content/t6xr42804q78040l/xxlarge1063.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) ![scy](/content/t6xr42804q78040l/xxlarge1089.gif) ![tcy](/content/t6xr42804q78040l/xxlarge1090.gif) ![Bcy](/content/t6xr42804q78040l/xxlarge1041.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) ![scy](/content/t6xr42804q78040l/xxlarge1089.gif) ![scy](/content/t6xr42804q78040l/xxlarge1089.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![Ncy](/content/t6xr42804q78040l/xxlarge1053.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) ![khcy](/content/t6xr42804q78040l/xxlarge1093.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![Vcy](/content/t6xr42804q78040l/xxlarge1042.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![gcy](/content/t6xr42804q78040l/xxlarge1075.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![zhcy](/content/t6xr42804q78040l/xxlarge1078.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Rcy](/content/t6xr42804q78040l/xxlarge1056.gif) . ![Mcy](/content/t6xr42804q78040l/xxlarge1052.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![scy](/content/t6xr42804q78040l/xxlarge1089.gif) ![tcy](/content/t6xr42804q78040l/xxlarge1090.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![zhcy](/content/t6xr42804q78040l/xxlarge1078.gif) ![Vcy](/content/t6xr42804q78040l/xxlarge1042.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Rcy](/content/t6xr42804q78040l/xxlarge1056.gif) ![zhcy](/content/t6xr42804q78040l/xxlarge1078.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Ncy](/content/t6xr42804q78040l/xxlarge1053.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![pcy](/content/t6xr42804q78040l/xxlarge1087.gif) ![scy](/content/t6xr42804q78040l/xxlarge1089.gif) ![lcy](/content/t6xr42804q78040l/xxlarge1083.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Dcy](/content/t6xr42804q78040l/xxlarge1044.gif) ![Ncy](/content/t6xr42804q78040l/xxlarge1053.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![tcy](/content/t6xr42804q78040l/xxlarge1090.gif) ![Mcy](/content/t6xr42804q78040l/xxlarge1052.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![CHcy](/content/t6xr42804q78040l/xxlarge1063.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) ![Ucy](/content/t6xr42804q78040l/xxlarge1059.gif) ![tcy](/content/t6xr42804q78040l/xxlarge1090.gif) ![scy](/content/t6xr42804q78040l/xxlarge1089.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![Bcy](/content/t6xr42804q78040l/xxlarge1041.gif) ![shcy](/content/t6xr42804q78040l/xxlarge1096.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![Rcy](/content/t6xr42804q78040l/xxlarge1056.gif) ![Ncy](/content/t6xr42804q78040l/xxlarge1053.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![pcy](/content/t6xr42804q78040l/xxlarge1087.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![lcy](/content/t6xr42804q78040l/xxlarge1083.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![zhcy](/content/t6xr42804q78040l/xxlarge1078.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![tcy](/content/t6xr42804q78040l/xxlarge1090.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![lcy](/content/t6xr42804q78040l/xxlarge1083.gif) ![softcy](/content/t6xr42804q78040l/xxlarge1100.gif) ![Ncy](/content/t6xr42804q78040l/xxlarge1053.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![gcy](/content/t6xr42804q78040l/xxlarge1075.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![Mcy](/content/t6xr42804q78040l/xxlarge1052.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) ![gcy](/content/t6xr42804q78040l/xxlarge1075.gif) ![Ncy](/content/t6xr42804q78040l/xxlarge1053.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![tcy](/content/t6xr42804q78040l/xxlarge1090.gif) ![Ncy](/content/t6xr42804q78040l/xxlarge1053.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) ![Ncy](/content/t6xr42804q78040l/xxlarge1053.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![Mcy](/content/t6xr42804q78040l/xxlarge1052.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) . ![pcy](/content/t6xr42804q78040l/xxlarge1087.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![tcy](/content/t6xr42804q78040l/xxlarge1090.gif) ![Rcy](/content/t6xr42804q78040l/xxlarge1056.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![gcy](/content/t6xr42804q78040l/xxlarge1075.gif) ![Rcy](/content/t6xr42804q78040l/xxlarge1056.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) ![Fcy](/content/t6xr42804q78040l/xxlarge1060.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![CHcy](/content/t6xr42804q78040l/xxlarge1063.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![scy](/content/t6xr42804q78040l/xxlarge1089.gif) ![kcy](/content/t6xr42804q78040l/xxlarge1082.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![scy](/content/t6xr42804q78040l/xxlarge1089.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![scy](/content/t6xr42804q78040l/xxlarge1089.gif) ![tcy](/content/t6xr42804q78040l/xxlarge1090.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) ![Bcy](/content/t6xr42804q78040l/xxlarge1041.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) 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![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![pcy](/content/t6xr42804q78040l/xxlarge1087.gif) ![Rcy](/content/t6xr42804q78040l/xxlarge1056.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![lcy](/content/t6xr42804q78040l/xxlarge1083.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![tcy](/content/t6xr42804q78040l/xxlarge1090.gif) ![Vcy](/content/t6xr42804q78040l/xxlarge1042.gif) ![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![zhcy](/content/t6xr42804q78040l/xxlarge1078.gif) ![Rcy](/content/t6xr42804q78040l/xxlarge1056.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) ![scy](/content/t6xr42804q78040l/xxlarge1089.gif) ![Vcy](/content/t6xr42804q78040l/xxlarge1042.gif) ![scy](/content/t6xr42804q78040l/xxlarge1089.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![gcy](/content/t6xr42804q78040l/xxlarge1075.gif) 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![Ocy](/content/t6xr42804q78040l/xxlarge1054.gif) ![Dcy](/content/t6xr42804q78040l/xxlarge1044.gif) ![Dcy](/content/t6xr42804q78040l/xxlarge1044.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![Fcy](/content/t6xr42804q78040l/xxlarge1060.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Rcy](/content/t6xr42804q78040l/xxlarge1056.gif) ![IEcy](/content/t6xr42804q78040l/xxlarge1045.gif) ![Ncy](/content/t6xr42804q78040l/xxlarge1053.gif) ![tscy](/content/t6xr42804q78040l/xxlarge1094.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) ![tscy](/content/t6xr42804q78040l/xxlarge1094.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![Mcy](/content/t6xr42804q78040l/xxlarge1052.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) ![gcy](/content/t6xr42804q78040l/xxlarge1075.gif) ![Mcy](/content/t6xr42804q78040l/xxlarge1052.gif) ![lcy](/content/t6xr42804q78040l/xxlarge1083.gif) ![Ucy](/content/t6xr42804q78040l/xxlarge1059.gif) ![Bcy](/content/t6xr42804q78040l/xxlarge1041.gif) ![Icy](/content/t6xr42804q78040l/xxlarge1048.gif) ![Ncy](/content/t6xr42804q78040l/xxlarge1053.gif) ![Acy](/content/t6xr42804q78040l/xxlarge1040.gif) .
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