Archean inheritances in the pyroxene–amphibole-bearing gneiss of the Méiganga area (Central North Cameroon): Geochemical and 207Pb/206Pb age imprints
作者： Alembert Alexandre Ganwa , Wolfgang Frisch , Wolfgang Siebel , Georges Emmanuel Ekodeck , Cosmas Kongyuy Shang
DOI: 10.1016/J.CRTE.2007.12.009
关键词:
摘要: The Meiganga area is located in the central part of Panafrican belt Cameroon. This region underlain by a granitic and gneissic basement, crosscut, covered basaltic phonolitic rocks. To southwest Meiganga, pyroxene-andamphibole-bearing gneiss shows geochemical characteristics Archean TTG (tonalite—trondhjemite—granodiorite) associations. studied samples show LREE enrichment relative to HREE (LaN/YbN =7 –28). pattern REE, particularly concentration Y Yb allowed us consider some as derived from an crust. Cathodoluminescence pictures zircon crystals reveal magmatic oscillatory zoning with inherited cores.
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