Oscillating retreat of the last British-Irish Ice Sheet on the continental shelf offshore Galway Bay, western Ireland

Oscillating retreat of the last British-Irish Ice Sheet on the continental shelf offshore Galway Bay, western Ireland
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爱尔兰西部戈尔韦湾近海大陆架上最后一个英国-爱尔兰冰盖的振荡退缩

DOI:
10.1016/j.margeo.2019.106087
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发表时间:
2020
期刊:
影响因子:
2.9
通讯作者:
Callard S
Callard S
中科院分区:
地球科学2区
文献类型:
--
作者:
Callard S

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在末次盛冰期,英国-爱尔兰冰盖延伸到爱尔兰西部高威湾近海的大陆架,并在豪猪滩达到最大的向西延伸。新的海洋地球物理数据,沉积物岩心和放射性碳测年被用来约束的风格和冰盖退缩的时间横跨中间到内架。冰下冰碛物中的放射性碳定年贝壳碎片限制了冰的前进到26.4 ka BP之后。最初的撤退是在24.4 ka BP之前进行的,明显早于以前的重建。地面线的撤退伴随着地面线的静止和/或局部再推进。一个大的复合大陆架中部接地带复合体标志着一个主要的接地线的位置,与冰接地和利润率振荡在这个位置,并可能之后,23万年BP。大陆架无冰17.1 cal。ka BP,但冰盖可能保留了海洋边缘,直到c。15.3 ka BP。撤退发生在一个冰川环境和冰盖边缘的浮动冰架。总的来说,这些证据表明,在最后一次冰消期,爱尔兰西部近海的海洋终止冰盖是动态和振荡的。
During the Last Glacial Maximum, the British-Irish Ice Sheet extended across the continental shelf offshore of Galway Bay, western Ireland, and reached a maximum westward extent on the Porcupine Bank. New marine geophysical data, sediment cores and radiocarbon dates are used to constrain the style and timing of ice-sheet retreat across the mid to inner-shelf. Radiocarbon dated shell fragments in subglacial till on the mid-shelf constrains ice advance to after 26.4 ka BP. Initial retreat was underway before 24.4 ka BP, significantly earlier than previous reconstructions. Grounding-line retreat was accompanied by stillstands and/or localised readvances of the grounding-line. A large composite Mid-Shelf Grounding Zone Complex marks a major grounding-line position, with the ice grounded and the margin oscillating at this position by, and probably after, 23 ka BP. The continental shelf was ice-free by 17.1 cal. ka BP, but the ice sheet may have retained a marine margin until c. 15.3 ka BP. Retreat occurred in a glacimarine setting and the ice sheet was fringed by a floating ice-shelf. Collectively, this evidence indicates a dynamic and oscillatory marine-terminating ice sheet offshore of western Ireland during the last deglaciation.
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