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

磁极反转时间尺度是板块构造学的一个组成部分。这个时间尺度对其他领域的研究也很有价值，但大部分时间尺度是基于间接方法，没有绝对的日期。使用40ar / 39ar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。霍尔计划在轨道调谐的时间尺度上校准波动的年龄，这样尺度就可以扩大，并精确地确定重大磁极逆转的日期。PI拥有精确测定灰烬中矿物质年代的设备，这样就可以确定时间尺度上较早的部分。

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.