DOI: 10.1016/j.palaeo.2015.09.035
论文题名: The sedimentary response to a rapid change in lake level in Lake Tanganyika
作者: McManus J. ; Severmann S. ; Cohen A.S. ; McKay J.L. ; Montanye B.R. ; Hartwell A.M. ; Brucker R.L.P. ; Wheatcroft R.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 440 起始页码: 647
结束页码: 658
语种: 英语
英文关键词: Geochemistry
; Lake Tanganyika
; Little Ice Age
; Transgression
; δ13C
; δ15N
英文摘要: We present records of sedimentary organic carbon, nitrogen, and carbonate, and stable isotope records of organic material and carbonate from a series of sediment cores that straddle the permanent chemocline in Lake Tanganyika. Sedimentation rates for these cores are consistent among the sites (~0.05-0.1cm y-1), and all records show an increase in sedimentary carbonate (aragonite) content centered at ~1879. The mid-19th century coincides with a major (~10m) lake level transgression. Throughout the period of lake level transgression and subsequent regression, the organic matter δ13C and δ15N records develop a prominent and coincident negative excursion followed by a return to values similar to those prior to the lake level transgression. This negative excursion in δ15N and δ13C is also coincident with an increase in carbonate-corrected organic carbon. We interpret the δ13C results as a decline in primary production during the transgression with the δ15N results signaling a concomitant increase in the reliance on nitrogen fixation as the nitrogen source. The coincident peak in organic carbon is interpreted as being a result of enhanced preservation driven by the precipitation and burial of aragonite. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68756
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Department of Geosciences, University of Akron, Akron, OH, United States; College of Earth Ocean and Atmospheric Sciences, Oregon State University, 104 CEOAS Admin Bldg, Corvallis, OR, United States; Department of Marine and Coastal Science, Rutgers, The State University of New JerseyNJ, United States; Department of Geosciences, University of Arizona, Tucson, AZ, United States
Recommended Citation:
McManus J.,Severmann S.,Cohen A.S.,et al. The sedimentary response to a rapid change in lake level in Lake Tanganyika[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,440