This study was carried out on sediment cores collected with a gravity corer from Laguna Cháltel, an almost circular crater lake located in Patagonia, Argentina (49.9°S, 71°W). The main magnetic carrier was Ti-magnetite in the pseudo–single domain range. A model using magnetic grain size and concentration, previously applied to Laguna Potrok Aike to infer lake-level changes, was used for Laguna Cháltel. The main requirement to apply the model is uniform magnetic mineralogy, which is the case for Laguna Cháltel. After magnetic data were compared with previously studied lake levels, it was found that the magnetic proxies that best follow hydrologic changes are ARM/SIRM (anhysteretic remanent magnetisation/saturation of isothermal remanent magnetisation) and ARM. The concentration proxy (ARM measured with a 100 mT alternating field and 0.05 mT direct field) was also used as wind indicator. High wind strength was found at around 3650 cal yr BP, and low wind strength for the last century. ARM/SIRM and ARM were used to infer the strength of fluvial runoff into the lake for a core collected close to the shore and near a tributary. The results show that the magnetic model is promising for inferring lake-level variations, particularly in Patagonian lakes.

中文翻译：

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测试基于岩石磁性代理的湖平面重建，用于 Laguna Cháltel（阿根廷巴塔哥尼亚）的沉积物记录

这项研究是对使用重力取芯器从位于阿根廷巴塔哥尼亚的一个几乎圆形的火山口湖 Laguna Cháltel 收集的沉积物岩心进行的（49.9°S，71°W）。主要磁性载体是伪单畴范围内的钛磁铁矿。Laguna Cháltel 使用了以前应用于 Laguna Potrok Aike 以推断湖泊水位变化的使用磁性粒度和浓度的模型。应用该模型的主要要求是均匀磁性矿物学，Laguna Cháltel 就是这种情况。在将磁数据与先前研究的湖泊水位进行比较后，发现最能跟随水文变化的磁代理是 ARM/SIRM（非滞后剩磁/等温剩磁饱和）和 ARM。浓度代理（ARM 用 100 mT 交变场和 0. 05 mT 直接场）也被用作风向指示器。在 3650 cal yr BP 左右发现了高风强度，而上个世纪的风强度较低。ARM/SIRM 和 ARM 用于推断流入湖中的河流径流强度，用于在靠近海岸和支流附近收集的核心。结果表明，磁模型有望用于推断湖平面变化，特别是在巴塔哥尼亚湖泊中。