U/Pb Zircon dating of the Kane Oceanic Core Complex, MAR

学术价值：关于洋中脊的形成和海底许多地方普遍存在的大型分离断层的移动速度，仍有许多未解之谜。该项目利用海底岩石（辉长岩和晚期长英质岩脉）和最先进的地质年代学技术，研究与大西洋中脊凯恩海洋核杂岩相关的剥离断层的运动。岩石样本已经到手了。用单个锆石U/Pb测定日期，确定地壳辉长岩的侵位年龄。分析将使用斯坦福大学的SHRIMP离子探针进行。为了交叉核对年龄，海底磁异常数据将与U/Pb锆石日期进行比较。结果将确定该地区板块扩张和分离断裂的速率，从而为凯恩巨型核杂岩生成地壳增生时间表。更广泛的影响：本研究支持EPScOR州机构的两名研究人员，其中一名是女性，并包括研究生培训部分。这项工作是对国际海洋钻探计划和RIDGE 2000计划的补充，这两个计划都是由nsf资助的研究计划。

Intellectual Merit: There remain many unanswered questions about the formation of mid-ocean ridges and the speed at which large detachment faults, which seem to be prevalent in many parts of the seafloor, move. This project uses seafloor rocks (gabbros and late stage felsic dikes) and state-of-the-art geochronology techniques to investigate the movement of detachment faults associated with the Kane Oceanic Core Complex on the mid-Atlantic Ridge. Rock samples are in-hand. Dates will be obtained using single zircon U/Pb to determine the emplacement ages of crustal gabbros. Analyses will be carried out using the SHRIMP ion probe at Stanford. To cross-check ages, seafloor magnetic anomaly data will be compared to the U/Pb zircon dates. Results should determine the rates of plate spreading and detachment faulting in the area, which will allow generation of a crustal-accretion timeline for the Kane Megamullion Core Complex.Broader Impacts: This research supports two investigators at an institution in an EPScOR state, one of whom is female, and includes a graduate student training component. The work is complementary to both the International Ocean Drilling Program as well as the RIDGE 2000 Program, both of which are NSF-funded research initiatives.