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首页> 外文期刊>Geochemistry, geophysics, geosystems >Cobalt-based age models of pelagic clay in the South Pacific Gyre
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Cobalt-based age models of pelagic clay in the South Pacific Gyre

机译：南太平洋环流中上层粘土的钴基年龄模型

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Dating pelagic clay can be a challenge due to its slow sedimentation rate, post-depositional alteration, and lack of biogenic deposition. Co-based dating techniques have the potential to create age models in pelagic clay under the assumption that the flux of non-detrital Co to the seafloor is spatially and temporally constant, resulting in the non-detrital Co concentrations being inversely proportional to sedimentation rate. We apply a Co-based method to the pelagic clay sequences from Sites U1365, U1366, U1369, and U1370 drilled during Integrated Ocean Drilling Program (IODP) Expedition 329 in the South Pacific Gyre. We distinguished non-detrital Co from detrital Co using multivariate statistical partitioning techniques. We found that the non-detrital flux of Co at Site U1370 is approximately twice as high as that at the other sites, implying that the non-detrital Co flux is not regionally constant. This regional variation reflects the heterogeneous distribution of Co in the water column, as is observed in the present day. We present an improved approach to Co-based age modeling throughout the South Pacific Gyre and determine that the Co-based method can effectively date oxygenated pelagic clay deposited in the distal open ocean, but is less reliable for deposition closer to continents. When extending the method to geologically old sediment, it is important to consider the paleolocation of a given site to ensure these conditions are met.
机译：由于其缓慢的沉积速度，沉积后的变化以及缺乏生物成因沉积，约会上层粘土可能是一个挑战。基于Co的测年技术有潜力在上层粘土中建立年龄模型，其前提是非碎屑Co到海底的通量在空间和时间上都是恒定的，从而导致非碎屑Co的浓度与沉积速率成反比。我们将基于Co的方法应用于在南太平洋环流的329号综合海洋钻探计划（IODP）远征项目中钻探的站点U1365，U1366，U1369和U1370的浮游粘土序列。我们使用多元统计划分技术将非碎屑Co与碎屑Co进行了区分。我们发现站点U1370处的Co的无损通量约为其他站点的两倍，这表明Co的无损通量在区域上不是恒定的。如今天所观察到的，这种区域变化反映了Co在水柱中的不均匀分布。我们提出了一种改进的方法，用于在整个南太平洋环流中进行基于Co的年龄建模，并确定基于Co的方法可以有效地对沉积在远洋中的含氧远洋粘土进行测年，但是对于靠近大陆的沉积而言可靠性较低。将方法扩展到具有地质学意义的旧沉积物时，重要的是要考虑给定地点的古地点，以确保满足这些条件。

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