The Effects of Gas Hydrates on Seismic Properties of Sediments and the Relation between the Occurrence of Bottom Simulating Reflectors and Vertical Tectonics - the Peruvian Margin

99-06891 Pecher99-07137 Clift99-06999 Ruppe建议在秘鲁边缘的利马盆地建立一个海洋地质野外项目，通过模拟和测试垂直构造活动与天然气水合物稳定性之间的关系以及相关的似海底反射体(BSR)的发展来研究天然气水合物的形成动力学。这项工作综合了地震数据、推断的地层关系和沉陷、沉积和侵蚀速率，以及在这一高沉积流体通量、高有机生产力和活跃的垂直构造地区的数值模拟技术。这些特征使秘鲁边缘成为大陆边缘的终端成员，并记录了水合物和BSR的存在。这项研究将作为拟议的秘鲁边缘钻探(消耗臭氧层物质钻探提案355-Full 7)的基准。该实地计划将于2000年在两艘R/V Sonne邮轮上进行，并将包括部署德国海底地震仪的“搭载”海底地震仪工作。这项拟议的工作将对垂直构造可能抑制天然气水合物的形成，从而缺乏BSR形成的假设进行检验。

99-06891 Pecher99-07137 Clift99-06999 RuppelThe recommended proposal is for a marine geological field program in the Lima Basin of the Peruvian margin to examine the dynamics of gas hydrate formation, by modeling and testing the relationship between vertical tectonic activity and the stability of gas hydrate and related development of bottom-simulating reflectors (BSR's). The work integrates seismic data, inferred stratigraphic relationships and subsidence, sedimentation, and erosion rates, and numerical modeling techniques in this area of high sediment fluid flux, high organic productivity, and active vertical tectonism. These characteristics place the Peruvian margin as an end-member in continental margins with documented hydrate and BSR occurrence. The research will serve as a baseline for the proposed Peruvian Margin drilling (ODP drilling proposal 355-Full 7). The field program will occur aboard two R/V Sonne cruises in 2000, and will consist of "piggyback" ocean bottom seismometer work involving the deployment of German ocean-bottom seismometers. The proposed work will provide a test of the hypothesis that vertical tectonics may suppress the formation of gas hydrates, with a subsequent lack of BSR formation.