...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Journal of Geology: a semi-quarterly magazine of geology and related sciences >Spatial and temporal distribution of sand-containing basin fills in the Holocene Rhine-Meuse delta, the Netherlands
【24h】

Spatial and temporal distribution of sand-containing basin fills in the Holocene Rhine-Meuse delta, the Netherlands

机译：荷兰全新世莱茵-默兹三角洲含砂盆地填充物的时空分布

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The quantitative significance of coarse-grained deposits in the overbank realm, such as crevasse-splay deposits, has not been studied at the delta scale or at the Holocene timescale. Such knowledge would be beneficial for understanding and explaining sediment distribution in delta plains. This study addresses delta-scale distribution of sand-containing basin fills and their sand-body proportion variability, based on eight valleywide cross sections in the Holocene Rhine-Meuse delta in the Netherlands. We found that sand-containing basin fills form 7.1% of the fluviodeltaic wedge, of which splay deposits are most frequently observed midway between the delta apex and the coast. Organic-clastic lake fills and bay-head delta deposits, in contrast, are limited to the distal delta plain. Over four successive periods (between 9000 and 800 cal yr BP), the largest proportions of splay deposits remain at 50-150 km downstream of the upstream-shifting delta apex. We show that intermediate floodbasin widths (between 3.1 and 3.6 km in the Holocene Rhine-Meuse delta) yield the highest proportions of splay deposits. High rates of base-level rise and wide floodplains both facilitate the creation of accommodation, which in turn provides conditions for peat-forming wetlands in which organic-clastic lake fills can develop. The results show that sand bodies form 26%-30% of sand-containing basin fills. This proportion is shown to be controlled by, among other variables, channel planform and superelevation of the trunk channel and substrate composition. We conclude that potentially large volumes of nonchannel sand bodies exist in distal delta plains. They constitute up to 39% of the reservoir volume in the distal Rhine-Meuse delta and yield relatively high connectedness ratios.
机译：尚未在三角洲规模或全新世时间尺度上研究过岸领域的粗粒沉积物（如裂隙-张开沉积物）的定量意义。这些知识将有助于理解和解释三角洲平原的沉积物分布。这项研究基于荷兰全新世莱茵-默兹三角洲的八个谷宽剖面，研究了含砂盆地填充物的三角尺度分布及其沙体比例变异性。我们发现含砂盆地填充物形成了潮汐三角洲楔形区的7.1％，其中三角洲和海岸之间的中部最常观察到张开沉积物。相比之下，有机碎屑湖充填物和湾头三角洲沉积物仅限于远三角洲平原。在四个连续的时期内（在9000和800 cal yr BP之间），最大比例的成层沉积物保留在上游漂移三角洲顶点下游50-150 km。我们表明，中间的流域宽度（在全新世的莱茵河－默兹三角洲之间在3.1至3.6 km之间）产生了最大比例的八角形矿床。较高的基础水位上升速度和宽泛的洪泛区都促进了适应的产生，反过来又为形成泥炭的湿地创造了条件，在这些湿地中可以形成有机碎屑湖。结果表明，砂体占含砂盆地填充物的26％-30％。除其他变量外，该比例显示受通道平面形状以及主干通道和基材成分的超高控制。我们得出结论，在三角洲远端平原可能存在大量的非河道砂体。它们最多占莱茵河-默兹河三角洲远端储层容积的39％，并且产生相对较高的连通率。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号