Abstract The timing of neoglacial advances in the Antarctic Peninsula (AP) is not yet well constrained. Accurate temporal reconstruction of Neoglaciation in the AP is needed to better understand past glacial responses and regional and global teleconnections during the Holocene. Here, we examine all available information about neoglacial advances in the South Shetland Islands (SSI) as well as in the broader geographical context of the AP region and Antarctic continent. In order to shed light on the contrasting chronologies existing for neoglacial advances in these regions, we focused on a case study where a detailed picture of the Holocene deglaciation was already available. Lake sediments revealed that Byers Peninsula, west of Livingston Island (SSI), was fully deglaciated during the Holocene Thermal Maximum. To complement this approach, we identified glacially polished bedrock surfaces, erratic boulders and a moraine ridge near the present front of the glacier in the SE corner. We applied cosmogenic ray exposure (CRE) dating using in situ 36Cl for basalt rocks and 10Be for granitic rocks in: (i) 8 samples from glacial erratic and ice-rafted boulders, (ii) 2 samples from moraine boulders, (iii) 2 samples from polished bedrock surfaces, and (iv) 1 sample from an erratic boulder deposited on one of these surfaces. The CRE dates indicate that the onset of deglaciation started around 9.9 ± 1.2 ka, with two phases of glacier expansion during the Mid-Late Holocene forming moraines at ∼4.1 ± 0.5 and ∼1.0 ± 0.2 ka, respectively. The main neoglacial advances in the AP and the SSI were mostly synchronous and coincided with cold periods, as shown by other records (e.g. glacio-isostatic marine terraces, marine and lake sediments). In addition, these periods of glacial expansion show a similar timing to those recorded in the Arctic. These results suggest that Neoglaciation was driven by global climate forcing in both polar areas despite temporal variations at regional and local scale.

中文翻译：

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南设得兰群岛（南极半岛）新冰川地貌形成的时间：区域和全球影响

摘要 南极半岛（AP）新冰期进展的时间尚未得到很好的限制。需要对 AP 中的新冰川作用进行准确的时间重建，以更好地了解过去的冰川反应以及全新世期间的区域和全球遥相关。在这里，我们研究了有关南设得兰群岛 (SSI) 以及亚太地区和南极大陆更广泛的地理环境中新冰川进展的所有可用信息。为了阐明这些地区新冰期进展存在的对比年表，我们专注于一个案例研究，其中已经可以获得全新世冰川消融的详细图片。湖泊沉积物显示，利文斯顿岛 (SSI) 以西的拜尔斯半岛在全新世极热期完全消融。为了补充这种方法，我们在东南角冰川的当前前沿附近发现了冰川抛光的基岩表面、不规则的巨石和冰碛脊。我们应用宇宙射线暴露 (CRE) 测年，对玄武岩使用原位 36Cl，对花岗岩使用 10Be，用于：(i) 8 个来自冰川不稳定和冰筏巨石的样品，(ii) 2 个来自冰碛巨石的样品，(iii) 2来自抛光基岩表面的样品，以及 (iv) 1 个来自沉积在这些表面之一上的不稳定巨石的样品。CRE 日期表明冰川消融开始于 9.9 ± 1.2 ka 左右，全新世中晚期冰川扩张的两个阶段分别在 ~4.1 ± 0.5 和 ~1.0 ± 0.2 ka 形成冰碛。AP 和 SSI 的主要新冰期进展大多是同步的，并与寒冷时期相吻合，如其他记录所示（例如 冰川等静压海洋阶地、海洋和湖泊沉积物）。此外，这些冰川扩张时期的时间与北极记录的时期相似。这些结果表明，尽管区域和地方尺度的时间变化，新冰川作用是由两极地区的全球气候强迫驱动的。