International Ocean Discovery Program (IODP) Expedition 382 in the Scotia Sea’s Iceberg Alley recovered among the most continuous and highest resolution stratigraphic records in the Southern Ocean near Antarctica spanning the last 3.3 Myr. Sites drilled in Dove Basin (U1536/U1537) have well‐resolved magnetostratigraphy and a strong imprint of orbital forcing in their lithostratigraphy. All magnetic reversals of the last 3.3 Myr are identified, providing a robust age model independent of orbital tuning. During the Pleistocene, alternation of terrigenous versus diatomaceous facies shows power in the eccentricity and obliquity frequencies comparable to the amplitude modulation of benthic δ¹⁸O records. This suggests that variations in Dove Basin lithostratigraphy during the Pleistocene reflect a similar history as globally integrated ice volume at these frequencies. However, power in the precession frequencies over the entire ∼3.3 Myr record does not match the amplitude modulation of benthic δ¹⁸O records, suggesting Dove Basin contains a unique record at these frequencies. Comparing the position of magnetic reversals relative to local facies changes in Dove Basin and the same magnetic reversals relative to benthic δ¹⁸O at North Atlantic IODP Site U1308, we demonstrate Dove Basin facies change at different times than benthic δ¹⁸O during intervals between ∼3 and 1 Ma. These differences are consistent with precession phase shifts and suggest climate signals with a Southern Hemisphere summer insolation phase were recorded around Antarctica. If Dove Basin lithology reflects local Antarctic ice volume changes, these signals could represent ice sheet precession‐paced variations not captured in benthic δ¹⁸O during the 41‐kyr world.

中文翻译：

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冰山胡同对上新世的南极气候节律的新地磁学见解

在斯科省海冰山胡同中进行的国际海洋发现计划（IODP）382号探险在南极洲附近的南大洋中恢复了最连续，最高分辨率的地层记录，跨越最近的3.3迈尔。在多芬盆地（U1536 / U1537）钻探的站点地磁地层学得到了很好的解决，并且在岩石地层学中具有强烈的轨道强迫印记。最后3.3 Myr的所有磁反转都被识别，提供了独立于轨道调谐的稳健的年龄模型。在更新世，陆源与在偏心和倾角频率硅藻土相节目功率的交替媲美底栖δ的幅度调制¹⁸O记录。这表明更新世期间鸽子盆地岩石地层学的变化反映了与这些频率下全球冰积总量相似的历史。然而，功率在进动的频率在整个~3.3秘耳记录不匹配底栖δ的调幅^18条Ø记录，提示鸠盆地包含在这些频率的唯一记录。相对于鸠盆地的磁性逆转相对于底栖δ地方相比较变化磁场逆转的位置¹⁸ Ø在北大西洋IODP网站U1308，我们证明鸽子盆地相在不同的时间比底栖δ变化¹⁸在大约3到1 Ma之间的时间间隔内为O。这些差异与岁差相移是一致的，并且表明在南极洲附近记录了南半球夏季日照期的气候信号。如果鸠盆地岩性反映本地南极冰量的变化，这些信号可表示底栖δ不捕获冰盖进动节奏的变化¹⁸在41-KYR世界中O操作。