globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00531-015-1276-x
Scopus记录号: 2-s2.0-84949506673
论文题名:
Zircon dating and mineralogy of the Mokong Pan-African magmatic epidote-bearing granite (North Cameroon)
作者: Tchameni R.; Sun F.; Dawaï D.; Danra G.; Tékoum L.; Nomo Negue E.; Vanderhaeghe O.; Nzolang C.; Dagwaï N.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2016
卷: 105, 期:6
起始页码: 1811
结束页码: 1830
语种: 英语
英文关键词: Central Africa Pan-African orogenic belt ; Magmatic epidote-bearing granite ; North Cameroon
Scopus关键词: crystallization ; deformation mechanism ; epidote ; geochronology ; granite ; magmatism ; mineralogy ; orogenic belt ; pluton ; Proterozoic ; uranium-lead dating ; zircon ; Cameroon ; Central Africa
英文摘要:

We present the mineralogy and age of the magmatic epidote-bearing granite composing most of the Mokong pluton, in the Central Africa orogenic belt (North Cameroon). This pluton intrudes Neoproterozoic (~830 to 700 Ma) low- to high-grade schists and gneisses (Poli-Maroua group), and is crosscut or interleaved with bodies of biotite granite of various sizes. The pluton is weakly deformed in its interior, but solid-state deformation increases toward its margins marked by narrow mylonitic bands trending NNE–SSW. The magmatic epidote granitic rocks are classified as quartz monzodiorite, granodiorite, monzogranite, and syenogranite. They are medium- to coarse-grained and composed of K-feldspar + plagioclase + biotite + amphibole + epidote + magnetite + titanite + zircon + apatite. In these granites, the pistacite component [atomic Fe+3/(Fe3+ + Al)] in epidote ranges from 16 to 29 %. High oxygen fugacity (log ƒO2 − 14 to −11) and the preservation of epidote suggest that the magma was oxidized. Al-in hornblende barometry and hornblende–plagioclase thermometry indicate hornblende crystallization between 0.53 and 0.78 GPa at a temperature ranging from 633 to 779 °C. Zircon saturation thermometry gives temperature estimates ranging from 504 to 916 °C, the latter being obtained on samples containing inherited zircons. U/Pb geochronology by LA-ICP-MS on zircon grains characterized by magmatic zoning yields a concordia age of 668 ± 11 Ma (2σ). The Mokong granite is the only known occurrence magmatic epidote in Cameroon, and is an important milestone for the comparison of the Central Africa orogenic belt with the Brasiliano Fold Belt, where such granites are much more abundant. © 2015, Springer-Verlag Berlin Heidelberg.

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84949506673&doi=10.1007%2fs00531-015-1276-x&partnerID=40&md5=eeffd481cf68e82b4f3edef367d443d2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70125
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Department of Earth Sciences, Faculty of Science, University of Ngaoundéré, PO Box 454, Ngaoundéré, Cameroon; College of Earth Sciences, Jilin University, Changchun, China; Department of Earth Sciences, Faculty of Science, University of Maroua, PO Box 814, Maroua, Cameroon; Department of Earth Sciences, Faculty of Science, University of Yaoundé I, PO Box 812, Yaoundé, Cameroon; GET, Observatoire Midi-Pyrénées, Université de Toulouse, CNRS, IRD, Toulouse Cedex, France; Department of Life and Earth Sciences, Higher Teachers’ Training College, University of Maroua, PO Box 55, Maroua, Cameroon; Laboratoire GéoRessources, Université de Lorraine, Vandoeuvre-lès-Nancy Cedex, France

Recommended Citation:
Tchameni R.,Sun F.,Dawaï D.,et al. Zircon dating and mineralogy of the Mokong Pan-African magmatic epidote-bearing granite (North Cameroon)[J]. International Journal of Earth Sciences,2016-01-01,105(6)
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