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首页> 外文期刊>Sedimentary geology >Provenance, palaeoclimate and palaeoenvironments of a non-marine Lower Cretaceous facies: Petrographic evidence from the Wealden Succession
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Provenance, palaeoclimate and palaeoenvironments of a non-marine Lower Cretaceous facies: Petrographic evidence from the Wealden Succession

机译：非海洋下白垩纪面部的出处，古娱乐和古环境：来自Weaolden连续的岩手证据

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Petrographic datasets from sedimentary rocks are very useful for reconstructing their palaeoenvironmental settings especially when field and fossil datasets are unobtainable or inadequate. This study presents the first detailed and comprehensive petrographic study of the four formations constituting the non-marine Lower Cretaceous of the Weald Sub-basin of south-east England and employed petrographic descriptions to reconstruct their palaeoenvironmental settings. 120 samples were subjected to petrographic (QEMSCAN (R), SEM, and thin section) analyses, which revealed that the framework composition of sediments is largely quartz-dominated (quartz arenites and subarkose) and has minor amounts of feldspar and lithics. The nature of the quartz arenites suggests that the Wealden successions were likely sourced from a stable interior craton/passive platform within a continental block and possibly from recycled flat-lying platforms such as low-lying granitic and gneissic bed-rocks. The nature, maturity and the compositions of the sandstones suggest palaeoclimatic conditions were probably mildly hot and moist at the massifs and these perhaps favoured intense chemical weathering. The significant quantity of micas suggests that the Wealden sediments largely experienced very insignificant degrees of turbulence and agitation en-route depositional sites, thus yielding unwinnowed sediments. The presence of micaceous minerals, poor winnowing effect, and the general absence of diagenetic glauconite validate non-marine depositional environments. The palaeoenvironmental changes that occurred in the Lower Cretaceous in the Weald Subbasin reflect (at least in part) palaeogeographic changes in NW Europe. (C) 2021 Elsevier B.V. All rights reserved.
机译：来自沉积岩石的岩手数据集对于重建古环境设置非常有用，特别是当场和化石数据集无法获得或不足时。本研究介绍了构成西部英格兰妇女盆地非海洋下白垩纪的四种形成的第一个详细综合的岩化研究，并采用了岩体描述来重建古环境环境。 >将120个样品进行岩体（QEMSCAN（R），SEM和薄剖面）分析，这揭示了沉积物的骨架组成主要是石英占主导地位（石英剧集和亚斯科索），并具有少量的长石和岩石。石英恒星的性质表明，Weaolden演替可能来自大陆块内的稳定内部克拉顿/被动平台，可能来自Recycled平板平台，如低洼的花岗岩和神经床岩。砂岩的性质，成熟和组合物表明古生物的病症可能在受体状态下温和，并且这些可能是强烈的化学风化。大量的云母表明，Weaolden沉积物在很大程度上经历了非常微不足道的湍流和搅拌的钝化沉积部位，因此产生了无负沉积物。云母矿物质的存在，缺乏效果差，普通缺乏成岩糖尿病验证非海洋沉积环境。在WEALD子巴西的下层白垩纪发生的古环境变化反映了NW欧洲的古地理变化。 （c）2021 Elsevier B.v.保留所有权利。

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