DOI: 10.1016/j.quageo.2019.101021
论文题名: Cyclostratigraphic age constraining for Quaternary sediments in the Makarov Basin of the western Arctic Ocean using manganese variability
作者: Park K. ; Kim J.-H. ; Asahi H. ; Polyak L. ; Khim B.-K. ; Schreck M. ; Niessen F. ; Kong G.S. ; Nam S.-I.
刊名: Quaternary Geochronology
ISSN: 18711014
出版年: 2020
卷: 55 语种: 英语
英文关键词: Cyclostratigraphy
; Glacial-interglacial cycles
; Laurentide Ice Sheet
; Manganese
; Western Arctic Ocean
Scopus关键词: age determination
; chronostratigraphy
; cyclostratigraphy
; diagenesis
; geochronology
; glacial-interglacial cycle
; Laurentide Ice Sheet
; manganese
; marine sediment
; paleoenvironment
; paleomagnetism
; Quaternary
; radiocarbon dating
; sedimentation rate
; Arctic Ocean
; Makarov Basin
英文摘要: The Quaternary paleoenvironmental history of the Arctic Ocean remains uncertain, mainly due to the limited chronological constraints, especially beyond the 14C dating limits of accelerator mass spectrometry (AMS). The difficulty in establishing reliable chronostratigraphies is mainly attributed to low sedimentation rates and diagenetic sediment changes, resulting in very poor preservation of microfossils and altered paleomagnetic records. In the absence of independent chronostratigraphic data, the age model of Pleistocene sediments from the Arctic Ocean is mainly based on cyclostratigraphy, which relates lithologic changes to climatic variability on orbital time scales. In this study, we used the Mn/Al record measured from the sediment core ARA03B-41GC retrieved from the Makarov Basin in the western Arctic Ocean. The Mn/Al variation was tuned to the global benthic oxygen isotope stack (LR04) curve under different assumptions for computational correlation. Regardless of assumptions, our computational approach led to similar ages of about 600–1,000 ka for the bottom part of the core. These age models were up to about 200 ka older than those derived from lithostratigraphic approaches. Interestingly, our new age models show that the Ca/Al peak, a proxy for a detrital input from the Laurentide Ice Sheet, first occurred about 150 ka earlier than those previously proposed. Therefore, our results suggest that the glaciers in northern North America developed more extensively at about 810 ka than in earlier glacial periods, and influenced the sedimentary and paleoceanographic environments of the Arctic Ocean much earlier than previously thought. In order to establish a more comprehensive age model, more work is needed to validate our findings with different sediment cores recovered from the western Arctic Ocean. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159903
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Division of Polar Paleoenvironment, Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon, 21990, South Korea; Department of Oceanography, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, South Korea; Byrd Polar and Climate Research Center, Ohio State University, 1090 Carmack Rd, Columbus, OH 43210, United States; Department of Geosciences, UiT-The Arctic University of Norway, Troms, N-9037, Norway; Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, Bremerhaven, D-27570, Germany; Korea Institute of Geoscience and Mineral Resources, 124 Gwahak-ro, Yuseong-gu, Daejeon, 34132, South Korea
Recommended Citation:
Park K.,Kim J.-H.,Asahi H.,et al. Cyclostratigraphic age constraining for Quaternary sediments in the Makarov Basin of the western Arctic Ocean using manganese variability[J]. Quaternary Geochronology,2020-01-01,55