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Geochemistry and preliminary Sr-Nd isotopic data on the Neoproterozoic granitoids from the Bantoum area, west Cameroon: evidence for a derivation from a Paleoproterozoic to Archaean crust
https://doi.org/10.15094/00003129
https://doi.org/10.15094/00003129a834cac0-82ed-4b80-ba0a-5c1cad37903e
名前 / ファイル | ライセンス | アクション |
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KJ00000044123 (3.7 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 2003-10-01 | |||||
タイトル | ||||||
タイトル | Geochemistry and preliminary Sr-Nd isotopic data on the Neoproterozoic granitoids from the Bantoum area, west Cameroon: evidence for a derivation from a Paleoproterozoic to Archaean crust | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | granite | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | geochemistry | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Sr-Nd isotope | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | crustal recycling | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | west-Cameroon | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00003129 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Nzolang, Charles
× Nzolang, Charles× Kagami, Hiroo× Nzenti, Jean Paul× Holtz, Francois |
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著者所属(英) | ||||||
en | ||||||
Graduate School of Science and Technology, Niigata University | ||||||
著者所属(英) | ||||||
en | ||||||
Graduate School of Science and Technology, Niigata University | ||||||
著者所属(英) | ||||||
en | ||||||
Departement des Sciences de la Terre, Universite de Yaounde | ||||||
著者所属(英) | ||||||
en | ||||||
Institut fur Mineralogie,Universitat Hannover | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | The Bantoum area in west Cameroon is composed of migmatitic gneisses associated with parallel strips of amphibolites,quartz-monzonites,biotite-granites, two-mica leucogranites and granitic dikes.Quartz-monzonites are metaluminous (A/CNK=0.8-0.9)I-type,biotite-granites are peraluminous (A/CNK=1.0-1.10)I-type, leucogranites are peraluminous (A/CNK=1.14)S-type granitoids.All are hyper-potassic rocks defining a calc-alkaline trend.Quartz-monzonites gave an Rb-Sr isochron age of 720+-61 Ma assumed to be a mixing age.The thermometry estimated from major elements and zircon saturation indicate that the biotite-granites crystallized from high temperature melts (812-866゜C) whereas leucogranites crystallized from low temperature melts (719-745゜C). The trace element distribution diagrams are characterized by an enrichment in LILE and LREE (5<La_N/Sm_N<17),with negative Nb,Ta,Sr and Ti anomalies. Model initial ^87Sr/^86 Sr ratios (620 Ma)are 0.707614-0.708363 for quartz-monzonites,0.711242-0.713784 for biotite-granites,and 0.715835 for leucogranites.They have highly negative ε_Nd (620 Ma)(-19~-11) and T_DM model ages ranging from 1.9 to 2.9 Ga. These geochemical and isotopic features imply that the granites are generated at different temperatures and from different crustal materials;they are the witnesses of the recycling of a Paleoproterozoic to Archean crust with minor inputs of juvenile magmas during the Pan-African orogeny. Chemical similarities between gneisses and some biotite-granites suggest that the partial melting of these gneisses may have contributed to the formation of granites. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA1130866X | |||||
書誌情報 |
Polar geoscience 巻 16, p. 196-226, 発行日 2003-10 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |