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(阿根廷)巴塔哥尼亚一个所谓马尔的拉古纳·波特罗克·艾克的调查的关键贡献。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年一次探险期间获得的现有地震剖面上进行，是深井钻探阶段之前的地震现场勘测的重要组成部分。该项目有四个主要主题：(I)调查较低的沉积层，以便为计划中的ICDP深井钻探找到一个不受干扰的适当取心位置；(Ii)提高对湖泊动力学的了解，包括其湖面因气候条件变化而剧烈波动；(Iii)重建拟议的MAAR结构的几何形状，以证明其熔岩岩浆的起源，并将其与其他描述良好的MAAR进行比较；(Iv)计算物质平衡，以揭开陨石坑的初始几何形状，并可能将其描述为风沙和尘埃的来源。

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.