| 坦桑尼亚西南部乌本迪带的构造演化特征 |
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| 引用本文： | 许康康.坦桑尼亚西南部乌本迪带的构造演化特征[J].地质与勘探,2019,55(2):585-599. |
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| 作者姓名： | 许康康 |
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| 作者单位： | 中国地质调查局天津地质调查中心 |
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| 基金项目： | 中国地质调查局项目（编号:121201006000150014）资助 |
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| 摘 要： | 乌本迪带主要位于坦桑尼亚西南部,由8个地体构成,不同地体具有不同的构造特征、岩浆作用和变质作用年龄。乌本迪带不是单一构造-热事件的产物,而是经过不同阶段的俯冲造山作用和盆地内沉积作用形成。本文通过综合整理不同时期乌本迪带内地质事件和构造地质背景资料,将乌本迪带的演化分为9个阶段,分别为新太古代阶段(2740～2640Ma)、新太古代-古元古代沉积阶段(2640～2050Ma)、古元古代乌萨加蓝阶段(2050～1930Ma)和乌本迪阶段(1930～1800Ma)、古-中元古代沉积阶段(1800～1400Ma)、中元古代的基博拉阶段(1400～1080Ma)、中-新元古代伊鲁米德阶段(1080～850Ma)以及新元古代-寒武纪早泛非作用伸展阶段(850～600Ma)和晚泛非作用阶段(600～500Ma),其中形成于乌萨加蓝阶段的弧后洋盆之后可能继续扩张,在乌本迪阶段又发生俯冲造山作用。乌本迪带内金矿田的形成与构造演化密切相关,早期阶段形成的"导矿"和"容矿"构造在后期演化中又不同程度的再活化,形成多期次的矿化作用。
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| 关 键 词： | 岩浆作用和变质作用年龄 构造地质背景 金矿田 乌本迪带 坦桑尼亚 |
| 收稿时间： | 2017/12/4 0:00:00 |
| 修稿时间： | 2018/3/20 0:00:00 |
Tectonic Evolution of the Ubendian belt in the southwest of Tanzania |
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| Xu KangKang.Tectonic Evolution of the Ubendian belt in the southwest of Tanzania[J].Geology and Prospecting,2019,55(2):585-599. |
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| Authors: | Xu KangKang |
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| Institution: | Tianjin Centre, China Geological Survey,Tianjin |
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| Abstract: | The Ubendian belt is mainly located in southwest of Tanzania and composed of 8 blocks, each has different tectonic characteristics, magmatic activity and metamorphic ages. It is not a product of a single tectonic-thermal event, instead resulted from different stages of subduction orogeny and sedimentation in the basin. In this paper, through comprehensive summarizing the geological events and tectonic settings in the Ubendian belt, we divide its evolution into 9 stages, Neoarchaean stage (2740-2640Ma), Neoarchaean-Paleoproterozoic sedimentation stage (2640-2050Ma), Paleoproterozoic Usagaran stage (2050-1930Ma), Paleoproterozoic Ubendian stage (1930-1800Ma), Paleo-Mesoproterozoic sedimentation stage (1800-1400Ma), Mesoproterozoic Kibaran stage (1400-1080Ma), Mesoproterozoic Irumide stage (1080-850Ma), Neoproteozoic-Mesoproterozoic early Pan-African extension stage (850-600Ma) and late Pan-African stage(600-500Ma). The ocean basin which formed in the back-arc environment of the Usagaran stage continued to expand and later subducted in the Ubendian stage. The formation of the goldfield in the Ubendian belt is closely related to the tectonic evolution. The ore-conducting and ore-hosting structures which formed in the early stage were reactivated in the later evolution and formed multi-stage mineralization. |
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