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首页> 外文期刊>Marine Geology >Post-glacial depositional environments in a mid-high latitude glacially-overdeepened sea loch, inner Loch Etive, western Scotland
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Post-glacial depositional environments in a mid-high latitude glacially-overdeepened sea loch, inner Loch Etive, western Scotland

机译：苏格兰西部内湖中部高纬度冰川过度深化的海湖中的冰川后沉积环境

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摘要

A high-resolution seismic and gravity coring survey has been conducted on inner, and part of outer Loch Etive, a 30 km long, 150 m deep sea loch on the west coast of Scotland. The seismic reflection profiles reveal a 30-60 m thick sediment pile that has accumulated on the floor of the loch since the last (Younger Dryas stadial) glacial re-advance 11-10 ka BP. Four seismic facies have been identified grouped into two seismic sequences, A and B, which are separated by a distinct reflector termed 'E1'. A highly reflective facies is interpreted as direct river input, an acoustically well-laminated, draped facies interpreted as fine-grained river sediments and a well-laminated to transparent facies interpreted as glaciomarine and glaciolacustrine. Throughout the loch, methane gas-rich sediments occur producing a chaotic seismic facies. The transition from glacially-influenced to river-dominated deposition is displayed by the seismic reflector El. Core analysis identified eight lithofacies. The oldest sediments are grey muddy sands and olive sandy silts, overlain by younger laminated greeny-grey muddy sand and greeny-grey and greeny-black homogeneous watery sandy mud. Abundant shell material is present throughout, notably the bivalve Arctica islandica, from which a ~(14)C age of 9490+-90 yr BP was obtained from the laminated greeny-grey muddy sands. The sediments are interpreted as being of glaciomarine and glaciolacustrine (Younger Dryas to early-mid Holocene) and more modern riverine-derived origin (mid-latest Holocene).
机译：在苏格兰西海岸30公里长，深150 m的深海湖泊Etive的内部和外部进行了高分辨率的地震和重力取心调查。地震反射剖面显示，自最后一次（年轻的德里亚斯球场）冰川再行进11-10 ka BP以来，湖底已堆积了30-60 m厚的沉积物堆。已经确定了四个地震相，分为两个地震序列A和B，这两个地震相被一个称为“ E1”的独特反射器隔开。反射性高的相被解释为直接河水输入，声学层合良好的垂褶相被解释为细颗粒河沉积物，层合良好的透明相被解释为冰川海洋和冰川湖相。在整个湖泊中，富含甲烷气体的沉积物出现，产生了混乱的地震相。地震反射器El显示了从冰川影响的沉积到河流为主的沉积的过渡。核心分析确定了八个岩相。最古老的沉积物是灰色的泥沙和橄榄色的沙质粉尘，上面覆盖着较年轻的层层叠叠的灰绿色和灰黑色的泥土，以及灰绿色和灰黑色均匀的水质沙质泥土。整个过程中存在丰富的壳层材料，尤其是双壳类Arctica islandica，从叠层的灰绿色泥沙中获得了〜（14）C年龄为9490 + -90 yr BP。沉积物被解释为是冰晶海洋和冰晶湖相（较年轻的树蛙至全新世早期-中新世）和更现代的河流起源（新世中期）。

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