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

OCE-9521114霍尔磁极反转时标是板块构造的基石。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，并不是绝对的。使用40Ar/39Ar的绝对日期现在可以通过一种独立的时间测量来检查，该时间测量基于与地球轨道变化有关的气候的周期性波动。霍尔计划校准轨道调谐时间刻度中的波动年龄，以便刻度可以扩大，并准确地确定重大磁反转的日期。PI拥有精确测定灰烬中矿物的年代的设备，这样就可以确定时间刻度的较老部分。

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.