DOI: 10.1016/j.gloplacha.2015.07.002
论文题名: A reference time scale for Site U1385 (Shackleton Site) on the SW Iberian Margin
作者: Hodell D. ; Lourens L. ; Crowhurst S. ; Konijnendijk T. ; Tjallingii R. ; Jiménez-Espejo F. ; Skinner L. ; Tzedakis P.C. ; Abrantes F. ; Acton G.D. ; Zarikian C.A.A. ; Bahr A. ; Balestra B. ; Barranco E.L. ; Carrara G. ; Ducassou E. ; Flood R.D. ; José-Abel Flores ; Furota S. ; Grimalt J. ; Grunert P. ; Hernández-Molina J. ; Kim J.K. ; Krissek L.A. ; Kuroda J. ; Li B. ; Lofi J. ; Margari V. ; Martrat B. ; Miller M.D. ; Nanayama F. ; Nishida N. ; Richter C. ; Rodrigues T. ; Rodríguez-Tovar F.J. ; Roque A.C.F. ; Goñi M.F.S. ; Sierro F.J. ; Singh A.D. ; Sloss C.R. ; Stow D.A.V. ; Takashimizu Y. ; Tzanova A. ; Voelker A. ; Xuan C. ; Williams T.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2015
卷: 133 起始页码: 49
结束页码: 64
语种: 英语
英文关键词: Cyclostratigraphy
; Iberian Margin
; IODP
; Millennial climate variability
; Oxygen isotopes
; Pleistocene
; Stratigraphic correlation
Scopus关键词: Amplitude modulation
; Calcium
; Climatology
; Continuous time systems
; Isotopes
; Oxygen
; Stratigraphy
; Thermal logging
; Cyclostratigraphy
; Iberian Margin
; IODP
; Millennial climate variabilities
; Oxygen isotopes
; Pleistocene
; Stratigraphic correlation
; Glacial geology
; benthic foraminifera
; biogenic deposit
; carbonate
; chronology
; climate variation
; cyclostratigraphy
; detrital deposit
; glacial deposit
; insolation
; Last Glacial
; oxygen isotope
; timescale
; uranium isotope
; Atlantic Ocean
; Iberian Margin
; Foraminifera
英文摘要: We produced a composite depth scale and chronology for Site U1385 on the SW Iberian Margin. Using log(Ca/Ti) measured by core scanning XRF at 1-cm resolution in all holes, a composite section was constructed to 166.5meter composite depth (mcd) that corrects for stretching and squeezing in each core. Oxygen isotopes of benthic foraminifera were correlated to a stacked δ18O reference signal (LR04) to produce an oxygen isotope stratigraphy and age model.Variations in sediment color contain very strong precession signals at Site U1385, and the amplitude modulation of these cycles provides a powerful tool for developing an orbitally-tuned age model. We tuned the U1385 record by correlating peaks in L* to the local summer insolation maxima at 37°N. The benthic δ18O record of Site U1385, when placed on the tuned age model, generally agrees with other time scales within their respective chronologic uncertainties.The age model is transferred to down-core data to produce a continuous time series of log(Ca/Ti) that reflect relative changes of biogenic carbonate and detrital sediment. Biogenic carbonate increases during interglacial and interstadial climate states and decreases during glacial and stadial periods. Much of the variance in the log(Ca/Ti) is explained by a linear combination of orbital frequencies (precession, tilt and eccentricity), whereas the residual signal reflects suborbital climate variability. The strong correlation between suborbital log(Ca/Ti) variability and Greenland temperature over the last glacial cycle at Site U1385 suggests that this signal can be used as a proxy for millennial-scale climate variability over the past 1.5. Ma.Millennial climate variability, as expressed by log(Ca/Ti) at Site U1385, was a persistent feature of glacial climates over the past 1.5Ma, including glacial periods of the early Pleistocene ('41-kyr world') when boundary conditions differed significantly from those of the late Pleistocene ('100-kyr world'). Suborbital variability was suppressed during interglacial stages and enhanced during glacial periods, especially when benthic δ18O surpassed ~3.3-3.5‰. Each glacial inception was marked by appearance of strong millennial variability and each deglaciation was preceded by a terminal stadial event. Suborbital variability may be a symptomatic feature of glacial climate or, alternatively, may play a more active role in the inception and/or termination of glacial cycles. © 2015 The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938784914&doi=10.1016%2fj.gloplacha.2015.07.002&partnerID=40&md5=3fe1840aa75ae624953ed3743277fd53
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11472
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, United Kingdom
Recommended Citation:
Hodell D.,Lourens L.,Crowhurst S.,et al. A reference time scale for Site U1385 (Shackleton Site) on the SW Iberian Margin[J]. Global and Planetary Change,2015-01-01,133.