Paleoclimate studies in Patagonia show a high Holocene climate variability, strongly controlled by the intensity and latitudinal position of the Southern Westerly Winds. In this study, environmental and climate variability, and in particular winter precipitation, was reconstructed over the last centuries through sedimentological and geochemical analyses of a core from Lake Jeinimeni in North East Patagonia. Visual description, X-ray radiographies and thin section observations point to finely laminated sediments, made by fine sands and light brown clayey silts forming an annual deposition (varves) occasionally interrupted by two Hudson volcano-related tephras and 15 pluri-millimetre to pluri-centimetre coarser sandy to gravely layers. Varve counting confirmed by ²¹⁰Pb and ¹³⁷Cs indicates a detrital sequence of at least 750 yr. Based on a correlation with local meteorological data for the 1930–1988AD interval, varve thickness and statistical treatment of XRF geochemical data give information on transport pathway and sedimentary deposit conditions. The sandy laminae correspond to the deposition of high sedimentary load delivered by austral spring snowmelt whereas the clayey silt laminae result of particle settling in the water column during low hydrodynamical conditions. Thicker varves observed in dry conditions underline the importance of aeolian transport in sedimentary deposition. During locally dry and windy summer, the wind may erode and remobilise the sedimentary deposits along the lake margins. The sandy and gravely layers record massive erosional events due to proximal watershed perturbation driven by climatic or tectonic mechanisms. The clastic varves of Lake Jeinimeni document environmental decadal to multidecadal variability in East Patagonia over the last centuries. The more pronounced sediment transition around 1750 CE is consistent with the inception of the Little Ice Age-type event, in agreement with North Patagonian paleoclimate reconstructions derived from glacier advances, lacustrine varve thickness and tree-ring records.

巴塔哥尼亚的古气候研究表明，全新世气候变化很大，受到南部西风的强度和纬度位置的强烈控制。在这项研究中，通过对巴塔哥尼亚东北部 Jeinimeni 湖岩心的沉积学和地球化学分析，重建了过去几个世纪的环境和气候变化，尤其是冬季降水。视觉描述、X 射线照片和薄片观察表明，由细砂和浅棕色粘土质粉砂制成的细层沉积物形成年度沉积物（瓦弗斯），偶尔被两个与哈德逊火山有关的火山灰和 15 毫米至多毫米的火山灰中断。厘米粗的沙质至砾质层。Varve 计数由²¹⁰ Pb 和¹³⁷确认Cs 表示至少 750 年的碎屑序列。根据与 1930-1988AD 区间当地气象数据的相关性，XRF 地球化学数据的变层厚度和统计处理提供了有关传输路径和沉积沉积条件的信息。沙质薄层对应于南方春季融雪带来的高沉积负荷的沉积，而粘土质粉质薄层是在低水动力条件下颗粒在水体中沉降的结果。在干燥条件下观察到的较厚的斑纹强调了沉积沉积中风成输运的重要性。在当地干燥多风的夏季，风可能会侵蚀和重新移动沿湖边缘的沉积物。由于气候或构造机制驱动的近端流域扰动，沙质和砾质层记录了大规模的侵蚀事件。Jeinimeni 湖的碎屑岩记录了过去几个世纪东巴塔哥尼亚的环境年代际变化。公元 1750 年左右更明显的沉积物转变与小冰河时代类型事件的开始一致，这与从冰川前进、湖泊海温厚度和树木年轮记录得出的北巴塔哥尼亚古气候重建一致。