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首页> 外文期刊>Precambrian Research >Control of fluid-pressure on early deformation structures in the Paleoproterozoic extensional Franceville Basin (SE Gabon)
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Control of fluid-pressure on early deformation structures in the Paleoproterozoic extensional Franceville Basin (SE Gabon)

机译：对古元古代伸展弗朗斯维尔盆地（SE加蓬）早期变形结构的流体压力控制

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The Franceville Basin (2100-2000 Ma) has been widely studied for its uranium deposits most of which are located close to the major faults at the transition from the FA to FB (FB1, FB2a and FB2b) Formations. These formations deposited during the Paleoproterozoic and represents volcano-sedimentary series. Well-preserved outcrops may be found in quarries (i.e. Old, Mikouloungou and Socoba) and along roads and railways' track (i.e. M'vengue). Our study identifies footwall anticlines and hangingwall forced synsedimentary synclines (i.e. progressive unconformities) associated with a NW -SE trending longitudinal normal faults. It also contributes to the identification of main (MPB) and secondary permeability barriers (SPB) promoting fluid-pressure at the FA-FB1 and FB2a-FB2b stratigraphic transitions. Multiscale and multidisciplinary approaches of outcrop studies allowed to describe synlithification and postlithification fluid -pressure related structures. Synlithification faults in Oklo quarry and sand injectites at M'vengue underlined the former structuration, while quartz veins and stylolites observed in Socoba quarry are associated with a postlithification stage. The observation from outcrop to centimeter scales of intraformational breccia reworked during postlithification extensional episodes (i.e. quartz veins and stylolites) close to synsedimentary faults at Oklo and Mikouloungou suggest a near -surface postlithification deformation model (i.e. chemical compaction). We propose a possible reconstruction model of fluid-pressure structuration at the basin scale. Solid bitumen and associated uranium ores are restricted to fluid-pressure structures related to hydraulic fracturing induced by oil migration. They are spatially restricted by permeability barriers within footwall forced anticlines. (C) 2016 Published by Elsevier B.V.
机译：弗朗斯维尔盆地（2100-2000 Ma）因其铀矿床而被广泛研究，其中大多数位于从FA到FB（FB1，FB2a和FB2b）地层过渡的主要断层附近。这些地层沉积于古元古代，代表火山沉积系列。在采石场（例如，Old，Mikouloungou和Socoba）以及公路和铁路沿线（例如，M'vengue）中可以找到保存完好的露头。我们的研究确定了与NW -SE向纵向正断层有关的下盘背斜线和上盘强迫同沉积线（即渐进不整合面）。它还有助于识别促进FA-FB1和FB2a-FB2b地层转换处流体压力的主要（MPB）和次要渗透性屏障（SPB）。露头研究的多尺度和多学科方法允许描述与流化作用有关的结石化和结石化后的流体结构。奥克洛（Oklo）采石场的固结化断层和M'vengue的喷砂层突出了前者的构造，而索科巴（Sokoba）采石场中观察到的石英脉和风石与后石化阶段有关。在石化后的扩张期（即石英脉和文石）在Oklo和Mikouloungou的同沉积断层附近，从露头到厘米尺度的内部构造角砾岩进行了重制，这表明了近地表石化后的变形模型（即化学压实）。我们提出了盆地规模的流体压力构造的可能重建模型。固体沥青和伴生的铀矿石仅限于与油运引起的水力压裂有关的流体压力结构。它们在空间上受到底盘强迫背斜内渗透性屏障的限制。 （C）2016由Elsevier B.V.发布

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