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Late Cretaceous and early Paleogene nutrient and paleoproductivity records from Blake Nose, western North Atlantic Ocean

机译:北大西洋西部布莱克鼻子的白垩纪晚期和古近纪早期营养和古生产力记录

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摘要

We evaluate phosphorus (P) and biogenic barium (bio-Ba) as nutrient burial and export productivity indicators for the Late Cretaceous and early Paleogene, combining these with calcium carbonate (CaCO_3), organic carbon (C), and bulk CaCO_3 C isotopes (δ~(13)C). Sample ages span 36-71 Ma (~1 sample/0.5 m.y.) for a depth transect of sites in the western North Atlantic (Blake Nose, Ocean Drilling Program Leg 171B, Sites 1052, 1051, and 1050). We use a multitracer approach including redox conditions to investigate export productivity surrounding the global Paleocene δ~(13)C maximum (~57 Ma). Reducing conditions render most of the bio-Ba record not useful for export productivity interpretations. P and organic C records indicate that regional nutrient and organic C burial were high at ~61 and ~69 Ma, and low during the Paleocene δ~(13)C maximum, a time of proposed global high relative organic C burial. Observed organic C burial changes at Black Nose cannot explain this C isotope excursion.
机译:我们评估磷(P)和生物钡(bio-Ba)作为白垩纪晚期和古近纪营养埋葬和出口生产力的指标,并将其与碳酸钙(CaCO_3),有机碳(C)和大量CaCO_3 C同位素结合起来( δ〜(13)C)。在北大西洋西部(Blake Nose,海洋钻探计划第171B号腿,站点1052、1051和1050)的深度断面,样本年龄跨度为36-71 Ma(〜1样本/0.5 m.y.)。我们使用包括氧化还原条件在内的多示踪方法来研究全球新世δ〜(13)C最大值(〜57 Ma)周围的出口生产力。减少的条件使大多​​数生物钡记录不能用于出口生产力的解释。磷和有机碳记录表明,区域营养物和有机碳埋藏在〜61和〜69 Ma时较高,而在古新世δ〜(13)C最大时期(建议的全球相对有机碳埋藏时间)较低。在黑鼻子处观察到的有机碳埋藏变化无法解释这种C同位素偏移。

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