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首页> 外文期刊>Stratigraphy >Eocene biogeochronology and magnetostratigraphic revision of ODP Hole 762C, Exmouth Plateau (Northwest Australian Shelf)
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Eocene biogeochronology and magnetostratigraphic revision of ODP Hole 762C, Exmouth Plateau (Northwest Australian Shelf)

机译：埃克斯茅斯高原（澳大利亚西北大陆架）ODP Hole 762C的始新世生物地球年代学和地层学修订

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摘要

We present a chronostratigraphic model for the Eocene from ODP Leg 122 Hole 762C (northwest Australian shelf), integrating calcareous nannofossil data with previously published planktonic foraminiferal data, magnetostratigraphy and stable isotopic data. This ～240m thick interval extends from magnetic polarity Chron C25r to Chron C15r, and nannofossil zones CP6/7 to CP16a (NP7/8-NP21). Examination of the calcareous nannofossil biostratigraphy showed several potential hiatuses within this stratigraphic section at Hole 762C. The presence of these hiatuses was supported by cross-correlation of planktonic foraminiferal P-zones, magnetostratigraphic reversals and δ 13C and δ 18O isotopic excursions. These biostratigraphic and isotopic data were used to re-evaluate the original magnetostratigraphy, and this revised framework was integrated into a new age model. The original depositional model from Leg 122 proposed a continuous section with relatively low sedimentation rates in the Lutetian and basal Ypresian (< 1.0cm/ky); however, our results suggest that sedimentation rates were relatively high but that the section is interrupted by four hiatuses, each ～1-2 myr in duration. This new age model allowed revision of sedimentation rates at Hole 762C. These revised rates are used to estimate the ages of calcareous nannofossil bioevents, which are compared to several additional, globally distributed localities.
机译：我们介绍了ODP Leg 122 Hole 762C（西北澳大利亚陆架）始新世的年代地层模型，将钙质纳米化石数据与先前发表的浮游有孔虫数据，地磁地层学和稳定的同位素数据相结合。 〜240m厚的间隔从磁极Chron C25r延伸到Chron C15r，以及纳米化石带CP6 / 7至CP16a（NP7 / 8-NP21）。钙质纳米化石生物地层学检查显示，在762C孔的该地层剖面内有几种潜在的裂隙。浮游有孔虫P区的互相关，地磁地层反转以及δ13C和δ18O同位素偏移支持了这些裂隙的存在。这些生物地层学和同位素数据用于重新评估原始地磁地层学，并将这一修订后的框架整合到新的年龄模型中。 Leg 122的原始沉积模型提出了一个连续的断面，在Lutetian和基底伊普尔人中沉积速率相对较低（<1.0cm / ky）。然而，我们的结果表明，沉积速率相对较高，但该断面被四个裂隙打断，持续时间约〜1-2 myr。这种新的年龄模型允许修订762C孔的沉积速率。这些修订后的比率用于估算钙质纳米化石生物事件的年龄，并将其与其他几个全球分布的地区进行比较。

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