High resolution seismic investigations of the south-western Baltic sea: A seismic pre-site survey for the IODP-Proposal 'Paleo-environmental evolution of the Baltic Sea Basin through the last glacial cycle'

波罗的海盆地（BSB）是世界上最大的大陆内盆地之一。BSB在其整个地质历史中一直充当沉积汇，积累的沉积物构成了一个独特的高分辨率古环境档案，其中保存了流域和盆地本身的历史。IODP Pre-Proposal 672-Pre’s last glacial旋回波罗的海盆地的古环境演化主要研究过去间冰期-冰期旋回的气候发展，重点研究末间冰期Eemian及其向Weichselian的过渡。科学指导和评估小组认为波罗的海盆地间冰期记录是一个非常令人兴奋的钻探目标，但也指出有必要用地震数据证明，已经选择了面积最大、干扰最小的钻探地点。提供足够质量的数据并提供解释框架是本应用程序的主要目标。在6月02日至16月02日期间，RV Heincke在卡特加特和波罗的海南部的五个建议的IODP钻井地点进行了地震预勘探，收集了数据。由于水深较浅且需要高分辨率，因此使用特别设计的50米48通道浅水拖缆和300米48通道常规拖缆组合记录数据。首先对新获得的数据进行分析，表明三个调查区域非常有希望恢复覆盖末次冰期旋回的完整复合沉积序列，这需要通过对数据的详细处理和解释来证实。

The Baltic Sea Basin (BSB) is one of the world¿s largest intra-continental basins. BSB has served as depositional sink throughout its geological history and accumulated sediments comprise a unique high-resolution paleoenvironmental archive where the history of the drainage area and the basin itself is preserved. The IODP Pre-Proposal 672-Pre `Paleoenvironmental evolution of the Baltic Sea Basin through the last glacial cycle¿ mainly aims in investigating the climatic development during the past interglacial-glacial cycle, with emphasis on the last interglacial, the Eemian, and its transition into the Weichselian. The Science Steering and Evaluation Panel regards the Baltic Sea basin interglacial record as a very exciting drilling target but also points out that it is necessary to demonstrate with seismic data that most expanded and least disturbed locations for drilling has been chosen. To provide these data in sufficient quality and to provide an interpretational framework is the main objective of this application. Data were collected around five suggested IODP drilling sites in the Kattegat and the southern Baltic Sea during a seismic presite-survey onboard RV Heincke from 06.02.06-16.02.06. Due to the shallow water depth and the required high resolution, data were recorded with a combination of an especially designed 50 m 48 channel shallow water streamer and a 300 m 48 channel conventional streamer. First analyses of the newly acquired data indicate the three of the surveyed areas are very promising locations for the recovery of a complete composite sedimentary sequence covering the last glacial cycle, which needs to be confirmed by detailed processing and interpretation of the data.