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

箱芯深海沉积物中自然 DRM/PDRM 锁定过程分析

• 批准号: 8718453
• 负责人: Steven Lund
• 金额: $ 18万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-04-01 至 1990-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8718453&HistoricalAwards=false
• 关键词: Analysis; Natural; DRM; PDRM; Lock

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.

研究人员将直接测量自然沉积的深海沉积物在沉积层表层获得自然剩余磁化的深度分布。研究人员将在加利福尼亚大陆边缘地区的盆地和巴顿悬崖外的深海中收集一套定向盒状岩心，研究这种剩磁锁锁分布，以及相关的岩石磁性和沉积特征。这些盒式岩心是在以前由国家科学基金会资助的一项类似研究的试点研究中收集的。这项初步研究的结果显示了一种有效的方法来估计10个锁定深度和其他关于沉积物如何获得磁化过程的有趣事实。在这项研究中，研究人员还建议收集盒芯，这些盒芯将采样生物扰动和非生物扰动的位置，沉降速率从2到50厘米/小时不等。通过对自然环境中底栖生物混合和沉积的研究，结合剩磁锁相分布的测量，希望对了解沉积物中自然剩磁的获取作出根本性的贡献。