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首页> 外文期刊>Marine Geology >Sedimentology, seismic facies and stratigraphy of a Holocene spit-platform complex interpreted from high-resolution shallow seismics, Lysegrund, southern Kattegat, Denmark
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Sedimentology, seismic facies and stratigraphy of a Holocene spit-platform complex interpreted from high-resolution shallow seismics, Lysegrund, southern Kattegat, Denmark

机译：高分辨率的浅层地震解释的全新世吐槽-台地复合体的沉积学，地震相和地层学，丹麦卡特加特省南部，Lysegrund

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Eighty kilometres of high-resolution seismic profiledata (8 km/km~2) were collected in the Lysegrund area, southernKattegat, Denmark to reconstruct the seismic stratigraphy of aHolocene spit-platform complex. Comparison of two sets ofseismic data shows a significant difference in reflection pattern. Byusing lap style analyses, four Holocene units were recognised inboomer profiles (0.8-2.0kHz). they are closely examined in thispaper and their geometry is illustrated in a series of isopach maps,drawn to understand the development of the deposit in time andspace. Three vibra cores provide the stratigraphic control anddemonstrate the presence of three lithofacies are part of a singlelithofacies succession. In contrast to the boomer profiles, thesubbottom profiles (3.5 kHz) demonstrate continuous accretionsurfaces within the lithofacies succession. Comparisons of theboomer and subbottom profile data therefore indicate that the threeboomer units are genetically coupled and that there are nosignifican time gaps between units. The three boomer units areinterpreted to represent a spit-platform complex that developed inthree phases during a general rapid rise of relative sea-level(>10mm/a) under conditions of excess sediment supply. The sourcematerials were mobilised from glacial-fluvial sediments in aheadland west of and close to the spit-platform. During phase 1,spit development occurred in shallow water. This acted as a core tothe development of a spit-platform during phase 2 that consisted ofthree seismic facies identifiable on 3.5kHz subbottom profiles.During phase 3, true foresets and bottomsets developed. Growthof the platform surface kept pace with sea-level rise and the entirespit-platform complex formed in less than a thousand years.Focusing on differences in the seismic data helps avoid pitfalls inchoosing methods to interpret data. The closely spaced seismicline-net forms the basis of a 3D dynamic model of the spit-platform that resembles the model of Meistrell [Meistrell, F. J.,1972. The split-platform concept: laboratory observations of spitdevelopment. In : Schwartz, M. L. (Ed.), Spits and Bars, Dowden,Hutchinson and Ross, Stroudsberg, pp. 225-283].
机译：在丹麦Kattegat南部的Lysegrund地区收集了八十公里的高分辨率地震剖面数据（8 km / km〜2），以重建全新世吐出平台复合体的地震地层。两组地震数据的比较显示出反射模式存在显着差异。通过搭接式分析，可以识别出四个全新世单元（0.8-2.0kHz）。在本文中对它们进行了仔细的研究，并在一系列等值线图中说明了它们的几何形状，绘制这些图以了解矿床在时空上的发展。三个振动岩心提供地层控制，并证明三个岩相的存在是单岩相演替的一部分。与婴儿潮剖面相反，亚底剖面（3.5 kHz）显示了岩相序列内连续的增生面。因此，对婴儿潮时期和下底剖面数据的比较表明，三个婴儿潮时期的单元是遗传耦合的，并且单元之间没有明显的时间间隔。解释说这三个臂架单元代表了在过量沉积物供应的条件下，相对海平面（> 10mm / a）普遍快速上升期间，分三个阶段形成的吐水平台综合体。源材料是从吐槽平台以西和附近的前陆冰川-河流沉积物中调集的。在第一阶段中，浅水区发生了吐痰。这是第2阶段吐出平台发展的核心，该阶段由在3.5kHz底下剖面上可识别的三个地震相组成。在第3阶段，形成了真实的前兆和下陷。在不到一千多年的时间里，平台表面的增长与海平面的上升保持同步，形成了整个平台平台。关注地震数据的差异有助于避免陷阱成为选择数据解释方法的陷阱。紧密间隔的地震线网形成了类似于Meistrell [Meistrell，F. J.，1972。分裂平台的概念：对唾液发育的实验室观察。在：Schwartz，M. L.（编辑），Spits and Bars，Dowden，Hutchinson和Ross，Stroudsberg，第225-283页]。

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