Some lateral moraines contain a rich record of Holocene glacial expansion. Previous workers have used such evidence to document glacial fluctuations in western Canada, Alaska, and the U.S. Pacific Northwest, but similar studies in Patagonia are uncommon. Here we report on the late Holocene behavior of Stoppani Glacier, a 75 km2 glacier sourced in the Cordillera Darwin, southernmost Patagonia. Based on radiocarbon-dated wood and organic material contained in the glacier's northeast lateral moraine, we infer that Stoppani Glacier advanced shortly before 3.8–3.6, at 3.2–2.8, 2.3–2.1, and 0.3–0.2, and possibly sometime before 1.4–1.3 and 0.8–0.7 cal ka BP. These advances culminated at 0.3–0.2 cal ka BP, when the glacier constructed a prominent end moraine, marking its greatest extent of the past 4000 years. Although the timing of several of the advances overlap with the age range of glacial expansion recognized elsewhere in Patagonia, some do not. Asynchronous behavior observed in the glacial record may arise from the type of evidence (e.g., lateral stratigraphy vs. end moraine) used to document glacial fluctuations or variations in climate or glacial response times. A significant difference between the Stoppani record and some other Patagonian records is that the former indicates general expansion of ice over the last 4000 years, whereas the latter indicate a net decrease in extent over that period.

中文翻译：

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巴塔哥尼亚最南端斯托帕尼冰川的晚全新世波动

一些横向冰碛包含丰富的全新世冰川扩张记录。以前的工作人员已经使用这些证据来记录加拿大西部、阿拉斯加和美国太平洋西北部的冰川波动，但在巴塔哥尼亚进行的类似研究并不常见。在这里，我们报告了 75 公里的 Stoppani 冰川的晚全新世行为。2冰川起源于巴塔哥尼亚最南端的达尔文山脉。根据冰川东北侧冰碛中包含的放射性碳年代测定木材和有机物质，我们推断斯托帕尼冰川在 3.8-3.6、3.2-2.8、2.3-2.1 和 0.3-0.2 之前不久推进，可能在 1.4-1.3 之前的某个时间和 0.8–0.7 cal ka BP。这些进展在 0.3–0.2 cal ka BP 达到顶峰，当时冰川形成了一个突出的末端冰碛，标志着它在过去 4000 年中的最大程度。尽管一些进展的时间与巴塔哥尼亚其他地方承认的冰川扩张的年龄范围重叠，但有些则不然。在冰川记录中观察到的异步行为可能来自用于记录冰川波动或气候或冰川响应时间变化的证据类型（例如，横向地层与末端冰碛）。