کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4729680 1356555 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Zircon 207Pb/206Pb evaporation ages of Panafrican metasedimentary rocks in the Kombé-II area (Bafia Group, Cameroon): Constraints on protolith age and provenance
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Zircon 207Pb/206Pb evaporation ages of Panafrican metasedimentary rocks in the Kombé-II area (Bafia Group, Cameroon): Constraints on protolith age and provenance
چکیده انگلیسی

The Kombé-II area belongs to the southern part of the Cameroonian Panafrican belt. It is made up of different gneisses, amphibolites and quartzites of the Bafia Group. This volcano-sedimentary rock sequence became polyphasely deformed and metamorphosed during the Panafrican orogeny. It was thrust in SSW-ward direction, parallel to the L2 stretching lineation, over the Congo Craton.Zircon morphology and 207Pb/206Pb evaporation ages (2289–2351 Ma) show that the gneissic metasediments contain detritus of Paleoproterozoic plutonic rocks. In addition to existing data, our zircon ages and Nd model ages (generally in the range of 2.4–3.4 Ga) indicate that the sedimentary sequence derived from material which was added to the crust between the Archean and the Mesoproterozoic era. A garnet-amphibole paragneiss, however, has a Nd model age of 1.5 Ga demonstrating the contribution of younger mafic material in the sediment source. Our results strengthen earlier suggestions that NE Brazil and Central Africa followed the same evolution during the Proterozoic.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of African Earth Sciences - Volume 51, Issue 2, May 2008, Pages 77–88
نویسندگان
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