Seismic site characterization of the proposal ICDP drilling project in the Baza Basin (Southern Spain)

西班牙南部的巴扎山内盆地是贝提克山脉晚新近世大陆盆地中最大的一个。它提供了从晚中新世到中更新世长达2.5公里厚的湖泊和附属大陆沉积物档案。巴扎盆地的充填主要是由湖泊杂岩同心相带的细粒沉积进行的。这些巢状古环境的扩张和收缩是气候变化的高度敏感指标，使巴扎盆地成为欧洲东南部最后7Ma古气候综合研究的独特地点。计划中的LARSEI钻探项目（Iberia SE湖相记录；提交给ICDP的预提案）提议钻探Baza蒸发盆地，以建立一个真实的古气候记录，该记录很可能反映了西地中海地区的事件以及全球气候里程碑。钻井活动的前提是对盆地构造和局部新构造变形带有深刻的认识，主要与盆地以西的巴扎断裂有关。我们建议获取地震多通道剖面，提供盆地和相关构造单元（即断层）的高分辨率图像。这些测量的结果将有助于指导钻井活动（包括钻井地点的选择、前期研究）和更好地了解巴扎盆地的构造和演化。

The intra-mountain Baza Basin in Southern Spain is the largest of the Late Neogene continental basins of the Betic Cordillera. It provides an up to 2.5 km thick archive of lacustrine and ancillary continental deposits from the Late Miocene to Middle Pleistocene. Infilling of the Baza Basin proceeded mainly by deposition of fine-grained deposits arranged in concentric facies belts in a lake complex. The expansion and contraction of these nested paleoenvironments serve as highly sensitive indicators of climate change which makes the Baza Basin a unique site for an integrated paleoclimate-oriented study of the last 7Ma of SE Europe. The planned LARSEI drilling project (LAcustrine Record of SE Iberia; submitted pre-proposal to ICDP) proposes to drill the Baza evaporitic basin in order to establish a realistic paleo-climatic record through the final Neogene (including the entire Pliocene) that very likely reflects regional events in the western Mediterranean as well as global climate milestones. Prerequisite for the drilling activities is the profound knowledge of the basin structure and local zones of neo-tectonic deformation, mainly related to the Baza fault bounding the basin to the West. We propose to aquire seismic multichannel profiles providing high-resolution images of the basin and related structural units (i.e. faults). The results of these measurements will both help to guide the drilling activities (including drilling site selection; presite study) and to better understand the structure and evolution of the Baza basin.