Late glacial sedimentology, foraminifera and stable isotope stratigraphy of the Hebridean Continental Shelf, northwest Scotland
Late glacial sedimentology, foraminifera and stable isotope stratigraphy of the Hebridean Continental Shelf, northwest Scotland
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苏格兰西北部赫布里底大陆架的晚冰期沉积学、有孔虫和稳定同位素地层学
DOI：
10.1144/gsl.sp.1996.111.01.13
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
D. Kroon
中科院分区：
文献类型：
--
作者：
William E. N. Austin;D. Kroon
摘要 介绍了来自苏格兰西北部赫布里底大陆架的两个浅海岩心的详细地层学。结果提供了大约 15.2 ka BP 冰川消退时间的证据，并有证据表明冷、低盐度的水持续存在于陆架上，直到至少 13.5 ka BP。在 13.5 ka BP 之后，可能在 13.0 ka BP 之前不久，温暖的浅陆架海形成并在大部分间质层中持续存在。有一些证据表明间质期气候不稳定，并且从 11.6 ka BP 之后开始出现变冷趋势。直到大约 11ka BP 之前，大陆架的冰川均衡回弹似乎一直与海平面上升保持同步。新仙女木体育场完全发育的条件直到距今 11ka 才被观测到。从海洋记录来看，北大西洋火山灰区 1 的火山灰峰首次被解析为一系列喷发事件，并表明大片海冰在整个新仙女木期侵入了英国西部大陆架。新仙女木期的气候条件一直持续到 10.2 ka BP 的初始前兆变暖，随后显着变暖约 8°C，并在 10 ka BP 之前完全建立了全新世早期的温度。新仙女木期期间积累的近 5 m 沉积物记录的许多变化可能与相对海平面和水源供应的变化有关。
Abstract The detailed stratigraphies of two shallow marine cores from the Hebridean shelf of northwest Scotland are presented. The results provide evidence on the timing of deglaciation from about 15.2 ka BP, with evidence of cold, low salinity water persisting on the shelf until at least 13.5 ka BP. After 13.5 ka BP, probably shortly before 13.0 ka BP, warm shallow shelf seas were established and persisted throughout much of the interstadial. There is some evidence for climatic instability during the interstadial and for a cooling trend from after 11.6 ka BP. Glacial isostatic rebound of the shelf seems to have kept pace with eustatic sea level rise until about 11 ka BP. The fully developed conditions of the Younger Dryas stadial are not observed until 11 ka BP. For the first time from the marine record the constituent tephra peaks of North Atlantic Ash Zone 1 are resolved into a sequence of eruptive events and demonstrate that extensive sea ice transgressed the western UK continental shelf throughout the Younger Dryas. The climatic conditions of the Younger Dryas persist until an initial, precursor warming at 10.2 ka BP, followed by a marked warming of about 8°C and fully established early Holocene temperatures before 10 ka BP. Many of the changes recorded through nearly 5 m of sediments accumulated during the Younger Dryas can be related to changing relative sea levels and source supply.