Linking sedimentary and speleothem precipitation isotope proxy records to improve lacustrine and marine 14C chronologies. (15th April 2022)

• Record Type: Journal Article
• Authors: Wang, Zheng; Zhang, Fan; Cao, Yunning; Hu, Jing; Wang, Huanye; Lu, Hongxuan; Dong, Jibao; Xing, Meng; Liu, Hu; Wang, Hong; Liu, Weiguo
• Is Part Of: Quaternary science reviews. Volume 282(2022)
• Publication Date: 2022-04-15
• Subjects: Geology, Stratigraphic -- Quaternary -- Periodicals; Stratigraphie -- Quaternaire -- Périodiques; 551.79
• DOI: 10.1016/j.quascirev.2022.107444
• Languages: English
• ISSNs: 0277-3791

Abstract

Abstract: The chronology of geological records in lacustrine, peatland and marine sediments for the late glacial depends mainly on 14 C dating technology, which provides the basic database for global paleoclimate research. However, 14 C reservoir correction always challenges the accuracy of the 14 C chronology of terrestrial and marine sediments and the uncertainty of the 14 C chronology associated with the carbon reservoir effect becomes critical for high resolution paleoclimate studies. Here, based on the hypothesis of synchronization of precipitation isotopes, we verify and identify a series of in-phase points of precipitation isotopes (IPPIs) between sediment leaf-wax hydrogen and stalagmite-calcite oxygen isotopes. Because stalagmite oxygen isotope records are accurately dated by U–Th dating technology, the ages of stalagmite IPPIs could be used to improve 14 C reservoir correction of lacustrine IPPIs. We found that reservoir-corrected 14 C ages of lacustrine, peat, and marine IPPIs are scattered with an average uncertainty of 1 ka when compared with the corresponding IPPIs on U–Th age scales. We suggest that the reservoir age correction at different time intervals could be further adjusted by using the U–Th age-backed IPPIs, which largely reduces the uncertainty of the 14 C chronology and thus provides more accurate paleoclimate records. Highlights: A series of in-phase points of precipitation isotopes (IPPIs) is identified between sediment δDwax and stalagmite δ 18 O. IPPIs' U–Th ages could be used to correct 14 C reservoir values in sediments. The IPPIs correction in lacustrine records is promising for improving climate integration studies.