DOI: 10.5194/cp-9-2391-2013
Scopus记录号: 2-s2.0-84887107038
论文题名: Re-evaluation of the age model for North Atlantic Ocean Site 982 - Arguments for a return to the original chronology
作者: Lawrence K.T. ; Bailey I. ; Raymo M.E.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 5 起始页码: 2391
结束页码: 2397
语种: 英语
Scopus关键词: depth determination
; geochronology
; hiatus
; marine isotope stage
; Ocean Drilling Program
; oxygen isotope
; paleomagnetism
; Pliocene
; sedimentation rate
; stable isotope
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: Recently, the veracity of the published chronology for the Pliocene section of North Atlantic Ocean Drilling Program Site 982 was called into question. Here, we examine the robustness of the original age model as well as the proposed age model revision. The proposed revision is predicated on an apparent misidentification of the depth to the Gauss-Matuyama (G/M) polarity chronozone reversal boundary (2.581 Ma) based on preliminary shipboard paleomagnetic data, and offers a new chronology that includes a hiatus between ∼3.2 and 3 Ma. However, an even more accurate shore-based, u-channel-derived polarity chronozone stratigraphy for the past ∼2.7 Ma supports the shipboard composite stratigraphy and demonstrates that the original estimate of the depth of the G/M reversal in the Site 982 record is correct. Thus, the main justification forwarded to support the revised chronology no longer exists.We demonstrate that the proposed revision results in a pronounced anomaly in sedimentation rates proximal to the proposed hiatus, erroneous assignment of marine-isotope stages in the Site 982 Pliocene benthic stable oxygen isotope stratigraphy, and a markedly worse correlation of proxy records between this site and other regional paleoclimate data. We conclude that the original chronology for Site 982 is a far more accurate age model than that which arises from the published revision.We strongly recommend the use of the original chronology for all future work at Site 982. © Author(s) 2013. CC Attribution 3.0 License. 资助项目: NSF, National Science Foundation
; NSF, National Science Foundation
; NSF, National Science Foundation
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49357
Appears in Collections: 气候变化与战略
There are no files associated with this item.
Recommended Citation:
Lawrence K.T.,Bailey I.,Raymo M.E.. Re-evaluation of the age model for North Atlantic Ocean Site 982 - Arguments for a return to the original chronology[J]. Climate of the Past,2013-01-01,9(5)