Analysis of the Natural DRM/PDRM Lock-In Process in Box- Cored Deep-Sea Sediments

研究人员将直接测量自然沉积的深海沉积物在沉积沉积物表层获得自然剩余磁化的深度分布。研究人员将在一套定向的盒状岩心中研究这种剩磁锁定分布，以及相关的岩石-磁性和沉积特征，这些岩心是在加利福尼亚州大陆边界盆地和巴顿海角以外的深海中收集的。这些盒状岩芯是在之前NSF/资助的一项类似研究的先导研究中收集的。这项初步研究的结果显示了一种有效的方法来估计十个锁定深度和关于沉积物如何获得磁化过程的其他有趣的事实。在这项研究中，研究人员还建议收集箱形岩芯，这些岩芯将对生物扰动和非生物扰动区域进行采样，沉积速率从大约2到50厘米/Ky不等。将剩磁锁定分布的测量与底栖生物在自然环境中的混合和沉积研究相结合，以期对理解沉积物中天然剩磁的获取做出根本性的贡献。

The investigators will directly measure the depth distribution along which naturally-deposited deep-sea sediments acquire their natural remanent magnetization in the surficial layers of sedimentary deposits. The investigators will study this remanence-lock-in distribution, and associated rock- magnetic and sedimentary characteristic, in a suite of oriented box-cores collected in basins of the California Continental Borderland and in the deep ocean beyond the Patton Escarpment. These box cores were collected in a previously NSF/funded pilot study for a similar kind of research. The results of this pilot study show a valid methodology for estimating ten lock-in depths and other interesting facts about the process of how sediments acquire magnetization. In this study, the investigators also propose to collect box-cores that will sample both bioturbated and non-bioturbated localities with sedimentation rates which vary from about 2 to 50 cm/ky. By combing the measurement of the remanence-lock-in distribution with the study of benthic mixing and sedimentation in the natural environment, it is hoped that a fundamental contribution will be made in understanding of acquisition of natural remanent magnetization in sediment.