Geomagnetic Polarity Time Scale Calibration Using Laser 40Ar/39Ar Dating of Ash Layers from Ocean Drilling Program Cores

OCE-9521114大厅 磁极反转时间尺度是板块构造的一个组成部分。 这个时间尺度对其他研究领域也很有价值，但大部分时间尺度是基于间接方法，没有绝对的日期。 使用40 Ar/39 Ar的绝对日期现在可以通过基于与地球轨道变化相关的气候周期性波动的独立时间测量来检查。 霍尔计划校准轨道调谐时标中波动的年龄，以便可以扩展时标并精确确定重大磁反转的日期。 PI拥有精确测定灰烬中矿物质年代的设备，这样时间尺度的旧部分就可以被束缚住。

OCE-9521114 Hall The magnetic polarity reversal time scale is a building block of plate tectonics. This time scale is also valuable to other fields of research, yet much of the time scale is based on indirect methods that are not dated absolutely. Absolute dates using the 40 Ar/39 Ar can now be checked by an independent measure of time based on the periodic fluctuations in climate that are linked to changes in the Earth's orbit. Hall plans to calibrate ages of fluctuations in the orbitally tuned time scale so that scale can be extended and to precisely date significant magnetic reversals. The PI has the equipment with the precision to date minerals in ashes so that the older parts of the time scale can be tied down.