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Basische Gesteine aus Texenna (Nordosten Algeriens): Petrographie und Geochemie
Paperback
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ISBN10: 6630400887
ISBN13: 9786630400885
Publisher: Verlag Unser Wissen
Published: Aug 26 2026
Pages: 76
Weight: 0.25
Height: 0.18 Width: 6.00 Depth: 9.00
Language: German
ISBN13: 9786630400885
Publisher: Verlag Unser Wissen
Published: Aug 26 2026
Pages: 76
Weight: 0.25
Height: 0.18 Width: 6.00 Depth: 9.00
Language: German
Diese petrographische, metallogenetische und geochemische Untersuchung befasst sich mit den ozeanischen basischen Gesteinen des vulkanisch-sedimentären Komplexes von Texenna (Petite Kabylie, Algerien) im Vergleich zum westlichen perimediterranen Orogen. Die Analyse von 13 Dünnschliffen und 3 polierten Schnitten zeigt vier Fazies (Kissenlaven, porphyrische Basalte, Dolerite, Gabbros). Die Kissenlaven ( 250 m) weisen Grö en von 0,5 bis 3 m auf. Die intensive Spilitisierung (Fazies von Grünschiefer bis Amphibolit) hat die Primärmineralien in Chlorit, Aktinot, Epidot, Albit und Calcit pseudomorphisiert, wobei eine texturale Zonalität zu beobachten ist. Die disseminierte Mineralisierung umfasst Pyrit, Chalkopyrit, Pyrrhotit, Covellit, Hämatit, Chromit und Magnetit, was auf eine hydrothermale Zirkulation hindeutet. Die Hauptelemente weisen eine hohe Mobilität auf (SiO₂ 19-55 %; MgO: 0,09-12,82 %). Die unbeweglichen Elemente (Zr: 324 ppm) und die Spurenelementverhältnisse (Ta/Nb = 0,07; Ta/La = 0,05) bestätigen eine Affinität von N-MORB zu T-MORB. Die Anomalien von Rb, Zr und Pb deuten auf eine kontinentale Kontamination hin. Die Gesteine von Texenna stellen Relikte der ozeanischen Tethys-Kruste dar, die mit den mediterranen Ophiolithen übereinstimmen.
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