Deglacial chronology from County Donegal, Ireland: implications for deglaciation of the British–Irish ice sheet
Deglacial chronology from County Donegal, Ireland: implications for deglaciation of the British–Irish ice sheet
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爱尔兰多尼戈尔郡的冰消年表：对英国-爱尔兰冰盖冰消的影响
DOI：
10.1144/0016-764903-009
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发表时间：
2003
影响因子：
2.7
通讯作者：
P. Clark
中科院分区：
文献类型：
--
作者：
A. Mccabe;P. Clark
在爱尔兰北部，冰从末次盛冰期的内陆分散中心向北推进到大陆架上。我们约束的时间，随后的三个事件的加速器质谱法14 C测年的海洋微型动物群的淤泥在Corvish，县多尼加尔。早期和快速的冰消期的大陆架关闭西北爱尔兰发生前17.1 K 14 C年BP时，海洋泥浆形成在Trawbreaga湾。冰随后重新进入海湾的一些时间之间的15.0和14.0 K 14 C年BP和压缩当代海栈和海滩鹅卵石到一个山脊Ballycrampsey。早期冰消泥变形，在此冰readvance和再沉积地层反演14 C年龄16.0和15.2 K 14 C年BP。变形泥覆盖由未变形纹层沉积在该地区的最后一次冰消期后14.1 K 14 C年BP。北部早冰消期在c. 17 k 14 C年bp与爱尔兰海盆、爱尔兰西部和苏格兰东北部记录的冰消作用相关，表明整个英国-爱尔兰冰盖对北大西洋早期变暖的反应，导致其质量损失高达三分之二。随后的冰盖readvance之间的15.0和14.1 K 14 C年BP在北部是一个广泛的响应的英国-爱尔兰冰盖海因里希事件1在基拉德点体育场的一部分。高相对海平面，伴随着冰川消退在17 K 14 C年BP，并再次在14.1 K 14 C年BP表示大量的负载和随之而来的均衡抑郁症的英国-爱尔兰冰盖。
In the north of Ireland ice advanced northwards onto the continental shelf from inland centres of dispersion at the last glacial maximum. We constrain the timing of three subsequent events by accelerator mass spectrometry 14C dating of marine microfaunas from muds at Corvish, County Donegal. Early and rapid deglaciation of the continental shelf off northwestern Ireland occurred before 17.1 k 14C years bp when marine muds formed in Trawbreaga Bay. Ice subsequently readvanced into the bay some time between 15.0 and 14.0 k 14C years bp and compressed contemporary sea stacks and beach cobbles into a ridge at Ballycrampsey. Early deglacial muds were deformed during this ice readvance and redeposited with stratigraphically inverted 14C ages between 16.0 and 15.2 k 14C years bp. The deformed mud is overlain by undeformed laminae deposited during the final deglaciation of the area after 14.1 k 14C years bp. The early deglaciation in the north at c. 17 k 14C years bp is correlative with deglaciation recorded in the Irish Sea Basin, western Ireland and northeastern Scotland, indicating a response of the entire British–Irish ice sheet to early warming of the North Atlantic Ocean that resulted in a loss of up to two-thirds of its mass. Subsequent ice-sheet readvance between 15.0 and 14.1 k 14C years bp in the north is part of a widespread response of the British–Irish ice sheet to Heinrich event 1 during the Killard Point Stadial. High relative sea levels that accompanied deglaciation at 17 k 14C years bp and again at 14.1 k 14C years bp indicate substantial loading and attendant isostatic depression by the British–Irish ice sheet.