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首页> 外文期刊>AAPG Bulletin >Depositional processes of uniform mud deposits (unifites), Hedberg Basin, northwest Gulf of Mexico: New perspectives
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Depositional processes of uniform mud deposits (unifites), Hedberg Basin, northwest Gulf of Mexico: New perspectives

机译：墨西哥湾西北部海德堡盆地均匀淤泥沉积（单品）的沉积过程：新观点

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摘要

Structureless mud deposits (unifites) are a common depositional phenomenon in the intraslope basins of the continental slope of the northwest Gulf of Mexico. High-resolution acoustic data and long sediment cores from Hedberg Basin (middle slope) were used to provide a better insight into the origin of these enigmatic depositional units. The unifite, occurring in Hedberg Basin, is structureless under visual observations, but x-ray radiographs reveal that it consists of three divisions: (1) "U1 division," representing waning sequences of fine-grained (mud) turbidites, (2) "U2 division," characterized by faint, normally graded mud layers with occasionally wispy, silty interlaminae, and (3) "U3 division," characterized by a uniform appearance with no obvious sedimentological structures other than a faint banding of slightly siltier and slightly more clayey layers. High-resolution geophysical data reveal that there is no connection between intrabasinal sediment failures and the occurrence of unifites. We suggest that unifites have resulted from the deposition of a long-lasting (1.5–3 months), pulsating (showing internal surges), fine-grained turbidity current (dated at 28.6–29 ka) that originated from the flow transformation of a series of massive sediment failures on the shelf edge and/or upper continental slope. The fine-grained nature of the turbidity current is probably caused by the depositional segregation of the flow by depositing its coarsest material in intraslope basins in more proximal locations. We propose that the uniform texture of the unifite is attributed to the development of a stratification interface (lower stratified layer) generated by the continuous introduction of a turbulent sediment cloud in the intraslope basins. The lowest two unifite divisions are considered to develop prior to and during the development of the stratified layer.
机译：无结构泥浆沉积物（单品）是墨西哥西北海湾大陆斜坡 的斜坡内盆地的常见沉积现象。 使用了来自海德堡盆地（中坡）的高分辨率声波数据 和长的沉积物岩心，以更好地了解这些神秘的 的起源。沉积单位。在目视观察下，发生在海德堡盆地的 是无结构的，但是X射线照片 显示它由三个部分组成：（1）“ U1区域”，“ < sup> 表示细颗粒（泥状）浊度的递减序列， （2）“ U2分区”，其特征在于通常在正常情况下淡淡的泥层 纤细，粉质层间和（3） “ U3分区”，其特征是外观均匀，没有 明显的沉积结构，除了带状 略有淤泥和略多的黏土层。高分辨率的 地球物理数据表明， 基岩内沉积物破坏与单一岩的发生之间没有联系。 我们建议，单一岩是由 的沉积时间长（1.5–3个月），脉动（显示内部 浪涌），细颗粒浊度电流（日期为28.6–29 ka），这是由一系列 在陆架边缘和/或上 大陆坡上的大量沉积物破坏的流动转换引起的。浊度 流的细粒度性质可能是由于 流的沉积偏析，其原因是通过将其最粗糙的物质沉积在斜坡内盆地 中而引起的。近端位置。我们建议统一的统一纹理 归因于连续 的引入产生的分层 界面（下分层层）的发展。 盆地内的湍流沉积物云。最低的两个unifite分区被视为在分层层开发之前和期间进行 开发。

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    《AAPG Bulletin》 |2004年第6期|00000825-00000840|共16页
  • 作者

    Efthymios K. Tripsanas; William R. Bryant; Brett A. Phaneuf;

  • 作者单位

    Texas A&M University, Department of Oceanography, College Station, Texas 77843-3146thymios@ocean.tamu.edu;

    Texas A&M University, Department of Oceanography, College Station, Texas 77843-3146wbryant@ocean.tamu.edu;

    Texas A&M University, Department of Oceanography, College Station, Texas 77843-3146;

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