Marmara and Black seas: piston coring and high-resolution seismic surveying

在西南部黑海和东北马尔马拉海的工作需要20个海洋日，用于活塞和重力取心以及地震剖面图。在2005年和2008年由NSERC资助的两次巡航中，使用Kongsberg EM3000系列多波束系统、Huntec深海拖曳婴儿潮剖面仪和声学多普勒海流剖面仪对黑海西南部进行了全面测绘。2010年，使用安装在英国AUV AutoSub-III上的ADCP测量了与该地区强烈的沟道化盐水潜流有关的海流速度，并获得了一组海底抓取样本和电导率-温度-深度(CTD)剖面，以表征表层沉积物和盐水潜流的物理性质。拟议的取心是这项早期工作的重要后续工作，目的是了解地球物理数据集中成像的沉积地层的地面真实年龄和相，以及与现代咸水潜流有关的沉积过程。如果没有岩心样品的年代沉积记录，地震和多波束记录的价值有限，对这些沉积物的成因和与黑海与世界海洋重新连接的全新世有关的古海洋学的解释仍然是推测的。1998年、2000年、2002年、2005年和2008年，使用Huntec深拖式火花剖面仪和短取样器对东北马尔马拉海进行了调查和采样。需要较长的活塞芯来确定关键表面和沉积物的年龄。关键问题仍然没有得到回答，和/或受到其他工作人员质疑的已发表的解释需要更多的支持。

Twenty sea days are requested for work in the SW Black Sea and NE Marmara Sea, forpiston and gravity coring and seismic profiling. The SW Black Sea was thoroughly mapped in two NSERC-funded cruises in 2005 and 2008 using a Kongsberg EM3000-series multibeam system, a Huntec deep-tow boomer profiler and an acoustic Doppler current profiler. In 2010 current velocities associated with a strong channelized saline underflow in this area were measured using an aDcp deployed on the British AUV AutoSub-III, and a set of bottom grab samples and conductivity-temperature-depth (CTD) profiles were obtained to characterize surface sediments and physical properties of the saline underflow. The proposed coring is an essential follow-up to this earlier work in order to ground-truth ages and facies of the sedimentary strata imaged in the geophysical data sets, and sedimentary processes associated with the modern saline underflow. Without dated sedimentary records from core samples, the seismic and multibeam records have limited value, and interpretations of the genesis of these deposits and the paleoceanography related to Holocene reconnection of the Black Sea to the world ocean remain speculative. The NE Marmara Sea was surveyed and sampled in 1998, 2000, 2002, 2005 and 2008 using a Huntec deep-tow sparker profiler, short corer. Long piston cores are needed to establish the ages of key surfaces and deposits. Key questions remain unanswered and/or published interpretations which have been challenged by other workers need additional support.