Acquisition of a Superconducting Rock Magnetometer and a Field Free Room

9810773 Diehl这笔拨款为密歇根理工大学（MTU）古磁学实验室购买超导岩石磁力计（SRM）和无场室的费用提供部分支持。SRM将取代目前存在问题的旋转磁力计，旋转磁力计不能可靠地测量弱磁化样品。无场空间将优化SRM的性能，同时消除样品存储和转移过程中实验室诱导的粘性磁化。在MTU添加SRM将允许对弱磁化沉积物以及强磁化火成岩进行快速分析。目前的一些项目将受益于SRM的获取，包括：(1)研究火山灰的磁性，作为火山对比和大气分选指标的辅助；(2)从捷克共和国摩拉维亚喀斯特的洞穴沉积物中重建上更新世和全新世的古环境；(3)研究夏威夷基拉韦厄火山南侧Hilina断裂系统的运动速率。随着SRM的收购，未来的项目将包括以下内容：(1)研究犹他州西南部二叠纪与三叠纪岩石的不整合期；(2)利用基维诺半岛湖芯的磁性特征研究末次冰期以来的区域气候变化；(3)利用苏必利尔湖沉积物的长期变化和对比研究基维诺流的历史。＊＊＊

9810773 Diehl This grant provides partial support of the costs of acquiring a superconducting rock magnetometer (SRM) and field-free room for the paleomagnetics laboratory at Michigan Technological University (MTU). The SRM will replace their present spinner magnetometer that is besieged with problems and cannot be used to reliably measure weakly magnetized samples. The field free room will optimize the performance of the SRM while eliminating the acquisition of laboratory-induced viscous magnetization during storage and transfer of the samples. The addition of a SRM at MTU will allow rapid analyses of weakly magnetized sediments as well as more strongly magnetized igneous rocks. Some of the current projects that will benefit from the acquisition of the SRM include: (1) studies of the magnetic properties of volcanic ash as an aid in tephra correlation and as indicators of atmospheric fractionation, (2) the reconstruction of upper Pleistocene and Holocene paleoenvironments from cave sediments in the Moravian Karst, Czech Republic and, (3) investigations into the rates of movement along the Hilina Fault System on south flank of Kilauea Volcano, Hawaii. Future projects that will be made possible with the acquisition of the SRM include the following: (1) an investigation into the timing of the unconformity that separates Permian rocks from Triassic rocks in southwestern Utah, (2) investigations into regional climate changes since the last glaciation derived from magnetic properties of lake cores from the Keweenaw Peninsula, and (3) historical studies of the Keweenaw current based on secular variation and correlation of Lake Superior sediments. ***