High Resolution Paleomagnetic Secular Variation and SedimentHistory in Sediments from the Gulf of California: DSDP Site 480 and Atlantis II Cores

褶皱状的沉积物沿着 加州湾的海水中的污染物。 时间 这些沉积物的空间分布仍然是 他们的决心，他们的觉悟，他们的觉悟。 起源不确定。 卡林博士研究了 DSDP测站这些物质的古地磁特征 480. 目前的奖励是重新采样本网站，并 我在90年6月参加了一次取芯巡航， 集 他有五个目标：1）完善古地磁时间 现场480的天平，校准到Δ O 18记录， 在WHOI进行测量，并进行自动纹管计数 技术与A.苏塔 （斯克里普斯）在6月收集的盒芯上; 2）重建 过去250 Kyrs的生产力，海洋环流， 大陆性气候的XRF和LECO地球化学分析， 480号站点; 3）检查过去20 Kyrs的古地磁长期 变化记录在即将到来的活塞核心，日期与 AMS C14、Δ O 18和纹孔计数; 4）联合收割机岩石 磁性、沉积学和地球化学研究， 成岩作用对古地磁保真度的影响 在快速沉积的沉积物中记录的信号;以及5）使用 类似岩石的磁性和地球化学分析， 过去20年的时空变化 生产力和陆源输入到加州湾。

Anoxic, varved sediments are accumulating along the margins of the Gulf of California at especially high rates. The temporal and spatial distribution of these sediments remains to be determined, and consequently a full understanding of their origin is uncertain. Dr. Karlin has studied the geochemical and paleomagnetic character of these materials at DSDP Site 480. The present award is to resample this Site and to participate on a coring cruise in June '90 to augment this data set. He has five objectives: 1) refine the paleomagnetic time scale at Site 480, calibrating to a delta O18 record that will be measured at WHOI, and to an automated varve-counting technique in collaboration with similar work by A. Soutar (Scripps) on box cores to be collected in June; 2) reconstruct the last 250 Kyrs of productivity, ocean circulation , and continental climate from XRF and LECO geochemical analyses from Site 480; 3) examine the last 20Kyrs of paleomagnetic secular variation recorded in the upcoming piston cores, dating with AMS C14, delta O18 and varve counting; 4) combine rock magnetic, sedimentological and geochemical studies to evaluate the effects of diagenesis upon the fidelity of paleomagnetic signals recorded in rapidly deposited sediments; and 5) use similar rock magnetic and geochemical analyses to characterize the last 20Kyrs of spatial and temporal variations in productivity and terrigenous input to the Gulf of California.