金红石U-Pb年龄及其对刚果克拉通恩特姆复合体(喀麦隆南部)埃伯恩盖印时间延伸的影响

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Nzesseu Nandjou Valentino , Bineli Betsi Thierry , Belinga Belinga Cédric , Ekomane Emile , Kelepile Tebogo
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引用次数: 0

摘要

为了解喀麦隆恩特姆复合体南部刚果克拉通的构造-变质演化,开展了冲积金红石 EPMA 地球化学研究和 LA-ICP-MS U-Pb 地质年代研究,首次获得了刚果克拉通该区段金红石的可靠年龄。铌的浓度从 287 ppm 到 7074 ppm 不等,锆和铬的浓度分别从 7 ppm 到 592 ppm 和 75 ppm 到 5836 ppm 不等。这些数据表明,明托冲积金红石主要来源于偏闪长岩及其附属的变质岩。金红石中的锌温度计显示温度范围在 430 ℃ 至 720 ℃ 之间,平均温度为 613 ℃。这表明冲积金红石岩源是在闪长岩变质作用条件下形成的。五颗冲积金红石晶粒的年代重叠且一致,分别为 1974 ± 8.8 Ma、1987 ± 13 Ma、1992.2 ± 8.4 Ma、1989.1 ± 8.3 Ma、1985.1 ± 12.1 Ma。这些结果都与单一的古近纪变质增长事件相一致。金红石年龄表明,位于恩特姆复合体南部的明托曾经历过埃伯尼热再生。因此,我们的研究结果扩展了喀麦隆刚果克拉通地区埃伯恩期覆盖的时间和位置,超出了之前公认的时空窗口。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Rutile U-Pb ages and implications for the extension of the timing of the Eburnean overprint in the Ntem Complex (southern Cameroon) portion of the Congo Craton
To gain an understanding of the tectono-metamorphic evolution of the Congo Craton in the southern Cameroonian Ntem Complex, alluvial rutile EPMA geochemistry and LA-ICP-MS U-Pb geochronology were carried out, and for the first time, robust rutile ages are obtained in that section of the Congo Craton. Concentrations of Nb vary from 287 to 7074 ppm and those of Zr and Cr from 7 to 592 ppm, and from 75 to 5836 ppm, respectively. These data suggest Minto alluvial rutile was sourced from mainly metapelitic and accessorily metamafic rocks. The Zr-in-rutile thermometer indicates a range of temperatures between 430 and 720 °C, with an average temperature of 613 °C. This suggests that the alluvial rutile rock sources were formed under conditions of amphibolite facies metamorphism. Five alluvial rutile grains yield overlapping and concordant ages of 1974 ± 8.8 Ma, 1987 ± 13 Ma, 1992.2 ± 8.4 Ma, 1989.1 ± 8.3 Ma, 1985.1 ± 12.1 Ma, respectively. These results are all consistent with a single Paleoproterozoic metamorphic growth event. The rutile ages suggest that Minto, in the southern part of the Ntem Complex, was subjected to Eburnean thermal rejuvenation. Therefore, our findings extend the timing and location of the Eburnean overprint in the Cameroonian Congo Craton portion beyond the previously recognised spatiotemporal window.
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来源期刊
Journal of African Earth Sciences
Journal of African Earth Sciences 地学-地球科学综合
CiteScore
4.70
自引率
4.30%
发文量
240
审稿时长
12 months
期刊介绍: The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.
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