Seismic investigation of sedimentary fill and bedrock geometry of maar lake "Potrok Aike", Southern Patagonia (potential ICDP drill site)

计划中的项目是对位于巴塔哥尼亚（阿根廷）一个假定的马尔的拉古纳Potrok Aike的调查的一个关键贡献。该湖被认为揭示了长达77万年的可能未受干扰的高分辨率古气候记录，并已被确定为国际大陆钻探计划（ICDP）的下一个优先事项之一。这里提议的项目将在2005年考察期间获得的现有地震剖面上进行，这是深钻阶段之前的地震现场前调查的一个重要部分。该项目有四个关键主题：㈠调查较低的沉积层，以便为计划中的ICDP深钻找到一个不受干扰的、适当的取芯位置; ㈡增进对湖泊动态的了解，包括对气候条件变化引起的湖平面剧烈波动的了解; ㈢重建拟议的玛珥结构的几何形状，以证明其来源于蒸汽岩浆作用，并将其与其他已详细描述的玛珥进行比较;以及（iv）计算质量平衡，以揭示陨石坑的初始几何形状，并可能将其描述为风成沙和尘埃的来源。

The planned project is a key contribution to investigations at Laguna Potrok Aike located in a supposed maar in Patagonia (Argentina). The lake is thought to reveal a probably undisturbed, high-resolution paleoclimate record of up to 770,000 years and has been identified as one of the next priorities of the International Continental Drilling Program (ICDP). The project proposed here will be conducted on the existing seismic profiles that were acquired during an expedition in 2005 and is an essential part of the seismic pre-site survey prior to the deep drilling phase. The project has four key themes: (i) investigation of the lower sedimentary layers in order to find an undisturbed, adequate coring location for the planned ICDP deep drilling; (ii) improve the understanding of the lake dynamics including its strong fluctuations in lake level due to changing climate conditions; (iii) the reconstruction of the geometry of the proposed maar structure in order to prove its phreatomagmatic origin and to compare it with other, welldescribed maars; and (iv) the calculation of mass balances in order to unravel the crater's initial geometry and to probably describe it as a source of eolian sand and dust.