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首页> 外文期刊>Sedimentary geology >Soft-sediment deformation structures in alkaline lake deposits of Lower Permian Fengcheng Formation, Junggar Basin, NW China: Implications for syn-sedimentary tectonic activity
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Soft-sediment deformation structures in alkaline lake deposits of Lower Permian Fengcheng Formation, Junggar Basin, NW China: Implications for syn-sedimentary tectonic activity

机译：下二叠纪凤城地层碱性湖泊矿床软泥沙变形结构，Junggar Bourin，NW中国：Syn-沉积构造活动的影响

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摘要

Soft-sediment deformation structures (SSDS) are an important tool for interpreting paleoseismicity and depositional environments in ancient basin successions. The northwestern margin of Junggar Basin is a key region for understanding the paleogeography and basin attribute of the Junggar Basin during the early Permian. In the Lower Permian (Kungurian) Fengcheng Formation, nine lithofacies are grouped into fan delta, fluvial delta, and shallow, deep and alkaline lacustrine fades associations. Vertical transitions of the sedimentary environments show that the lake basin experienced expansion during deposition of the Lower (P(1)f(1)) and Middle (P(1)f(2)) members and the shrinkage during the Upper Member (P(1)f(3)), which is consistent with the paleogeographic distribution of lithofacies indifferent members. Conventional cores show a wide variety of SSDS, including ductile (folds, convolute lamination, and load structures), hybrid ductile-brittle, and brittle deformation structures (microfaults, breccias, boudinage and sedimentary dikes). SSDS mainly occurred in a still and deep lacustrine environment. These deformation structures were not formed in any specific lacustrine environment, as there is no difference with the undeformed sedimentary units of the same sedimentary fades. Thus, the triggering mechanism is interpreted as intermittent earthquakes. Lake expansion under arid condition and SSDS intervals with vertical repetition and possible lateral continuity indicate that most seismicity was during the Middle Member (P(1)f(2)), corresponding with the main activity on basin-bounding normal faults. The enhanced faulting at this time generated accommodation, creating lacustrine conditions in the basin depocenter. It is thus clear that the early Permian Mahu sag represents an active rift basin with bounding faults, and is not a foreland basin. (C) 2020 Elsevier B.V. All rights reserved.
机译：软沉积物变形结构（SSD）是解释古盆地演替中古发神病和沉积环境的重要工具。 Junggar Basin的西北边缘是理解Junggar流域的古地理和盆地属性在二叠纪早期的关键区域。在较低的二叠纪（Kungurian）凤城形成，九个岩型遗传学分为粉丝三角洲，氟尿δ，浅，深，碱性湖泊淡化的关联。沉积环境的垂直过渡表明，湖泊盆地在沉积期间（P（1）F（1））和中间（P（1）F（2））构件和上部成员的收缩（P （1）F（3）），这与岩面积无动于衷的成员的古地理分布一致。常规核心显示各种SSD，包括韧性（折叠，卷曲层压和负载结构），杂合的韧性和脆性变形结构（微套，Budcias，Boudinage和沉积堤）。 SSD主要发生在仍然和深层湖泊环境中。这些变形结构未在任何特定的曲线环境中形成，因为与相同沉积的未变形沉积单元没有差异。因此，触发机制被解释为间歇地震。在干旱条件下扩展和具有垂直重复的SSD间隔和可能的横向连续性表明大多数地震性在中间构件（P（1）F（2）），对应于盆地正常故障的主要活动。在此时产生的增强故障产生了住宿，在盆地化中创造湖泊条件。因此显然，二叠纪早期的Mahu SAG代表了一个有边界断层的活跃裂缝盆地，而不是前陆盆地。 （c）2020 Elsevier B.v.保留所有权利。

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