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首页> 外文期刊>Sedimentology: Journal of the International Association of Sedimentologists >Using ichnological relationships to interpret heterolithic fabrics in fluvio-tidal settings
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Using ichnological relationships to interpret heterolithic fabrics in fluvio-tidal settings

机译：使用Ichnological关系来解释猪潮汐环境中的异质织物

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In fluvio-tidal settings, the sediment is dominantly derived from the river systems. However, the importance of landward tidal transport of sediment in tidally influenced sedimentary environments is difficult to assess, particularly in the rock record. This problem is addressed using two intervals within the Lower Cretaceous McMurray Formation, each representing a distinct inclined heterolithic stratification motif. The ichnological variation between the heterolithic intervals is analyzed to determine which lithosomes are associated with brackish-water (tidally influenced) colonization windows. From this, the relative fluvial influence responsible for the deposition of the fine and coarse members can be determined. Both of the inclined heterolithic stratification fabrics studied record the deposition of fluvio-tidal point bars wherein the heterolithic bedding represents variations in river discharge. The first fabric comprises inclined heterolithic stratification in which bioturbation only occurs in mudstone beds. This fabric indicates that deposition occurred in more proximal positions within a fluvio-tidal system (i.e. the outermost inner to middle estuary or distributary channels). In this example sand deposition is interpreted to represent high-energy, freshwater dune migration within a fluvial-dominated setting, whereas mud beds reflect brackish-water suspension deposition during times of low river discharge. The second fabric, which is interpreted to have developed in more distal depositional positions (i.e. the middle estuary or seaward of the turbidity maximum in deltas), consists of inclined heterolithic stratification with laminated mudstone and bioturbated sandstone. In these inclined heterolithic stratification successions the mudstone beds were deposited under the influence of freshwater and heightened sedimentation rates, whereas bioturbated sandstone was colonized under brackish-water conditions and in the presence of tidally facilitated sediment transport. In both examples, the bioturbated lithosomes are related to colonization windows that indicate the predominance at that time of marine or tidally influenced processes over fluvial processes.
机译：在Flyvio-Tidal设置中，沉积物主要来自河流系统。然而，沉积物在整个沉积环境中沉积物的陆地潮汐运输的重要性难以评估，特别是在岩石记录中。使用下白垩纪MCMurray形成内的两种间隔来解决该问题，每个间隔各自表示不同的倾斜异质分层基序。分析了异质间隔之间的IChnological变化，以确定哪些岩素与咸水（薄薄的）殖民化窗相关。由此，可以确定负责沉积精细和粗构件的相对河流影响。两者倾斜的异象分层织物研究记录潮流潮点杆的沉积，其中杂物床上用品代表河流排放的变化。第一织物包括倾斜的异象分层，其中生物扰动仅发生在泥岩床中。该织物表明诸如潮流潮汐系统内的更近侧位置（即中内部到中间河口或分销通道）的沉积发生。在该实施例中，砂沉积被解释为代表氟普齐特的设置内的高能量，淡水沙丘迁移，而泥浆床在低河流排放期间反射咸水悬浮沉积。第二种织物被解释为在更远侧沉积位置（即饮水中浊度最大的中间河口或浊度的海洋），由层压泥岩和生物干扰砂岩组成。在这些倾斜的异象分层继承中，泥岩床在淡水和加强沉降速率的影响下沉积，而生物干扰砂岩在咸水条件下进行殖民，并且存在于促进沉积物的存在下。在两个示例中，生物扰动的岩性睫状体物与殖民化窗口有关，该窗口指示在母猪过程中当时的越野或整个影响的过程。

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