Collaborative Research: Magnetofossils in Marine Sediments:Rock Magnetic Experiments on Artifical and Natural Samples

9725822莫斯科维茨海洋沉积物可以提供大陆沉积物或火山岩无法获得的地磁场行为的连续记录。趋磁细菌产生的单磁区磁铁矿颗粒被认为是海洋沉积物中重要的磁化记录器。然而，生物成因磁铁矿在磁化过程中的作用仍然知之甚少。P.I.S将在岩石磁学最新进展的基础上进行一系列实验，旨在测量海洋沉积物中磁化石的丰度和取向分布。这些实验将有助于确定磁性化石作为剩磁载体的作用(或缺乏)、趋磁细菌与沉积物氧化还原之间的联系、磁性化石的保存程度以及这些因素与海洋沉积物中剩磁锁定之间的相互关系。***

9725822 Moskowitz Marine sediments can provide continous records of geomagnetic field behavior that connot be obtained from continental sediments or volcanic rocks. Single-magnetic-domain particles of magnetite produced by magnetotactic bacteria have been proposed as important recorders of magnetization in marine sediments. Yet, the role of biogenic magnetite in the magnetization process remains poorly understood. The P. I.s will conduct a series of experiments based upon recent advances in rock-magnetism designed to measure the abundance and orientation-distribution of magnetofossils in marine sediments. These experiments will help to establish the role (or lack thereof) of magnetofossils as remanence carriers, links between magnetotactic bacteria and sediment redox, the degree of magnetofossil preservation, and the inter-relationships between these factors and the lock-in of magnetic remanence in marine sediments. ***