SCATTER - Investigating a potential systematic link between the flux of cosmic material and Earth’s orbital eccentricity throughout the Phanerozoic.

几十年来，旋回地层学一直是建立精确的年龄深度模型和了解古气候动力学的一个非常有价值的工具。最近，旋回地层学研究已越来越多地被用于这些传统用途之外的一系列应用。在这里，我们评估了米兰科维奇周期和整个显生界的宇宙尘埃之间的潜在联系。对地球轨道运动的数值模拟表明，在10万年的时间尺度上，地球对宇宙尘埃的捕获率变化了2到3倍，并与地球轨道偏心率成反比。到目前为止，由于目前使用的每一种化学和物理示踪剂都受到自己的一系列限制，重建显生界期间地外通量到地球的过程受到了阻碍。通过比较研究充分的显生界和新生代剖面，并增加一个新的替代品(化石微陨石)，该项目旨在澄清宇宙尘埃与地球轨道偏心率变化之间的关系，无论是在现代地质历史还是深部地质过去。微陨石化石十分丰富，根据最近建立的方案，可以通过溶解大量的沉积物或沉积岩(~4公斤/样品)从地质记录中恢复。如果能够系统地确定增强周期，就可以根据氧同位素系统学确定特定的尘埃源区，之后将从所获得的数据集中过滤出较短期的随机影响，并测试地外通量与偏心率之间的潜在关系。

Cyclostratigraphy has been a highly valuable tool for creating precise age-depth models and understanding paleoclimate dynamics for several decades now. More recently, cyclostratigraphic research has been increasingly used for a range of applications beyond these traditional uses. Here, we evaluate a potential link between Milankovitch cycles and cosmic dust throughout the Phanerozoic. Numerical modelling of Earth’s orbital motion suggests that, on 100,000-year timescales, Earth’s capture rate of cosmic dust varies by a factor of 2 to 3 and anti-correlates with Earth’s orbital eccentricity. To date, reconstructions of the extraterrestrial flux to Earth during the Phanerozoic are hindered as each of the chemical and physical tracers currently used, is riddled by its own set of limitations. By comparing well-studied Phanerozoic and Cenozoic sections and adding a novel proxy (fossil micrometeorites), this project aims to clarify the relation between cosmic dust and changes in the orbital eccentricity of the Earth, both in the recent and deep geological past. Fossil micrometeorites are abundant and can be recovered from the geological record by dissolving large volumes of sediments or sedimentary rock (~4 kg/sample) following recently established protocols. If periods of enhancement can systematically be identified, specific dust source regions may be defined based on oxygen isotope systematics, after which shorter-term, stochastic effects will be filtered out of the obtained data sets, and the potential relationship between extraterrestrial flux and eccentricity tested.