| DOI: | 10.1016/j.quascirev.2018.01.020
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| Scopus记录号: | 2-s2.0-85043321322
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| 论文题名: | Is the core top modern? Observations from the eastern equatorial Pacific |
| 作者: | Mekik F.; Anderson R.
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| 刊名: | Quaternary Science Reviews
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| ISSN: | 2773791
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| 出版年: | 2018
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| 卷: | 186 | | 起始页码: | 156
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| 结束页码: | 168
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| 语种: | 英语
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| 英文关键词: | Bioturbation
; Calcite dissolution
; Core top age
; Equatorial Pacific
; Focusing factor
; Holocene
; Mass accumulation rate
; Paleoceanography
; Radiogenic isotopes
; δ18O stratigraphy
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| Scopus关键词: | Biomarkers
; Calcite
; Carbon
; Dissolution
; Focusing
; Organic carbon
; Stratigraphy
; Bioturbation
; Calcite dissolution
; Core tops
; Equatorial Pacific
; Holocenes
; Mass accumulation rates
; Paleoceanography
; Radiogenic isotopes
; Sediments
; accumulation rate
; age determination
; bioturbation
; calcite
; carbonate
; dissolution
; Holocene
; index method
; marine sediment
; observational method
; organic carbon
; oxygen isotope
; paleoceanography
; radionuclide
; sedimentation rate
; stratigraphy
; East Pacific Rise
; Pacific Ocean
; Pacific Ocean (Equatorial)
; Panama Bight
; Globorotalia menardii
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| 英文摘要: | A compilation of ages from 67 core tops in the eastern equatorial Pacific (EEP) does not display an easily discernible regional pattern. The ages range from 790 to over 15,000 years. The youngest core tops with the highest sediment focusing factors are located in the Panama Basin. There are weak but statistically significant inverse relationships between core top age and age-model based mass accumulation rates, bioturbation depth, linear sedimentation rate and sediment focusing factors. However, we found no statistically significant relationship between core top age and calcite dissolution in sediments or 230Th-normalized mass accumulation rates. We found evidence suggesting that greater amount of sediment focusing helps to preserve the carbonate fraction of the sediment where focusing is taking place. When focusing factors are plotted against percent calcite dissolved, we observe a strong inverse relationship, and core tops younger than 4500 years tend to occur where focusing factors are high and percent calcite dissolved values are low. Using labile organic carbon fluxes to estimate bioturbation depth in the sediments results in the observation that where bioturbation depth is shallow (<4 cm), the core top age has a strong, inverse relationship with sediment accumulation rate. We used the Globorotalia menardii Fragmentation Index (MFI) as an indicator of percent calcite dissolved in deep sea sediments. There is a distinct pattern to core top calcite dissolution in the EEP which delineates bands of high surface ocean productivity as well as the clear increase in dissolution downward on the flanks of the East Pacific Rise. © 2018 Elsevier Ltd |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/112233
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| Appears in Collections: | 气候减缓与适应
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| Recommended Citation: | |
Mekik F.,Anderson R.. Is the core top modern? Observations from the eastern equatorial Pacific[J]. Quaternary Science Reviews,2018-01-01,186
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