DOI: 10.1016/j.quascirev.2018.03.012
Scopus记录号: 2-s2.0-85043450674
论文题名: A leaf wax biomarker record of early Pleistocene hydroclimate from West Turkana, Kenya
作者: Lupien R.L. ; Russell J.M. ; Feibel C. ; Beck C. ; Castañeda I. ; Deino A. ; Cohen A.S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 186 起始页码: 225
结束页码: 235
语种: 英语
英文关键词: Continental biomarkers
; East Africa
; Human evolution
; Hydrogen isotopes
; Organic geochemistry
; Paleoclimatology
; Pleistocene
; Turkana basin
Scopus关键词: Climatology
; Geochemistry
; Incident solar radiation
; Isotopes
; Lakes
; Solar radiation
; Spectrum analysis
; Time series analysis
; East Africa
; Human evolution
; Hydrogen isotope
; Organic geochemistry
; Paleoclimatology
; Pleistocene
; Turkana basin
; Biomarkers
; biomarker
; eccentricity
; fossil record
; hominid
; human evolution
; hydrogen isotope
; isotopic composition
; organic geochemistry
; paleoclimate
; Pleistocene
; progradation
; East Africa
; East African Lakes
; Lake Turkana
; Turkana Basin
英文摘要: Climate is thought to play a critical role in human evolution; however, this hypothesis is difficult to test due to a lack of long, high-quality paleoclimate records from key hominin fossil locales. To address this issue, we analyzed organic geochemical indicators of climate in a drill core from West Turkana, Kenya that spans ∼1.9–1.4 Ma, an interval that includes several important hominin evolutionary transitions. We analyzed the hydrogen isotopic composition of terrestrial plant waxes (δDwax) to reconstruct orbital-timescale changes in regional hydrology and their relationship with global climate forcings and the hominin fossil record. Our data indicate little change in the long-term mean hydroclimate during this interval, in contrast to inferred changes in the level of Lake Turkana, suggesting that lake level may be responding dominantly to deltaic progradation or tectonically-driven changes in basin configuration as opposed to hydroclimate. Time-series spectral analyses of the isotopic data reveal strong precession-band (21 kyr) periodicity, indicating that regional hydroclimate was strongly affected by changes in insolation. We observe an interval of particularly high-amplitude hydrologic variation at ∼1.7 Ma, which occurs during a time of high orbital eccentricity hence large changes in processionally-driven insolation amplitude. This interval overlaps with multiple hominin species turnovers, the appearance of new stone tool technology, and hominin dispersal out of Africa, supporting the notion that climate variability played an important role in hominin evolution. © 2018 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112243
Appears in Collections: 气候减缓与适应
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作者单位: Brown University, Department of Earth, Environment, and Planetary Sciences, 324 Brook Street, Providence, RI 02906, United States; Rutgers University, Department of Earth and Planetary Sciences, 610 Taylor Road, Piscataway, NJ 08854, United States; Hamilton College, Department of Geosciences, 198 College Hill Road, Clinton, NY 13323, United States; University of Massachusetts Amherst, Department of Geosciences, 627 North Pleasant Street, Amherst, MA 01002, United States; Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, United States; University of Arizona, Department of Geosciences, 1040 East 4th Street, Tucson, AZ 85721, United States
Recommended Citation:
Lupien R.L.,Russell J.M.,Feibel C.,et al. A leaf wax biomarker record of early Pleistocene hydroclimate from West Turkana, Kenya[J]. Quaternary Science Reviews,2018-01-01,186