Cyclostratigraphy and paleoenvironmental inference from downhole logging of sediments in tropical Lake Towuti, Indonesia

A. Ulfers, Katja Hesse, C. Zeeden, James M. Russell, Hendrik Vogel, S. Bijaksana, T. Wonik

Research output: Contribution to journalArticlepeer-review

Abstract

Lake Towuti is located on central Sulawesi/Indonesia, within the Indo Pacific Warm Pool, a globally important region for atmospheric heat and moisture budgets. In 2015 the Towuti Drilling Project recovered more than 1000 m of drill core from the lake, along with downhole geophysical logging data from two drilling sites. The cores constitute the longest continuous lacustrine sediment succession from the Indo Pacific Warm Pool. We combined lithological descriptions with borehole logging data and used multivariate statistics to better understand the cyclic sequence, paleoenvironments, and geochronology of these sediments. Accurate chronologies are crucial to analyze and interpret paleoclimate records. Astronomical tuning can help build age-depth models and fill gaps between age control points. Cyclostratigraphic investigations were conducted on a downhole magnetic susceptibility log from the lacustrine facies (10–98 m below lake floor) from a continuous record of sediments in Lake Towuti. This study provides insights into the sedimentary history of the basin between radiometric ages derived from dating a tephra layer (~ 797 ka) and C14-ages (~ 45 ka) in the cores. We derived an age model that spans from late marine isotope stage (MIS) 23 to late MIS 6 (903 ± 11 to 131 ± 67 ka). Although uncertainties caused by the relatively short record and the small differences in the physical properties of sediments limited the efficacy of our approach, we suggest that eccentricity cycles and/or global glacial-interglacial climate variability were the main drivers of local variations in hydroclimate in central Indonesia. We generated the first nearly complete age-depth model for the lacustrine facies of Lake Towuti and examined the potential of geophysical downhole logging for time estimation and lithological description. Future lake drilling projects will benefit from this approach, since logging data are available just after the drilling campaign, whereas core descriptions, though more resolved, only become available months to years later. © 2021, The Author(s).
Original languageEnglish (US)
Pages (from-to)377-392
Number of pages16
JournalJournal of Paleolimnology
Volume65
Issue number4
DOIs
StatePublished - 2021

Bibliographical note

Funding Information:
This research project was funded by the German Research Foundation (DFG, Grant No. WO672/15-1. The Towuti Drilling Project was funded, in part, by grants from the International Continental Scientific Scientific Drilling Program (ICDP), the US National Science Foundation (NSF), the German Research Foundation (DFG, Grant No. ME 1169/2Rag6), the Swiss National Science Foundation (SNSF; 20FI21_153054/1 and 200021_153053/1), Brown University, Genome British Columbia, and the Ministry of Research, Technology and Higher Education (RISTEK). We thank the Towuti Drilling Project team for helpful discussions of results during and after post-drilling workshops. Our special thanks go to our technical staff, Thomas Grelle and Jan-Thorsten Blanke, for acquisition of geophysical downhole logging data on site, and Henrike Baumgarten and Cornelia M?ller, for sample handling and laboratory work in the Leibniz Institute for Applied Geophysics. We also appreciate the work of anonymous reviewers and editors.

Funding Information:
This research project was funded by the German Research Foundation (DFG, Grant No. WO672/15-1. The Towuti Drilling Project was funded, in part, by grants from the International Continental Scientific Scientific Drilling Program (ICDP), the US National Science Foundation (NSF), the German Research Foundation (DFG, Grant No. ME 1169/2Rag6), the Swiss National Science Foundation (SNSF; 20FI21_153054/1 and 200021_153053/1), Brown University, Genome British Columbia, and the Ministry of Research, Technology and Higher Education (RISTEK). We thank the Towuti Drilling Project team for helpful discussions of results during and after post-drilling workshops. Our special thanks go to our technical staff, Thomas Grelle and Jan-Thorsten Blanke, for acquisition of geophysical downhole logging data on site, and Henrike Baumgarten and Cornelia Müller, for sample handling and laboratory work in the Leibniz Institute for Applied Geophysics. We also appreciate the work of anonymous reviewers and editors.

Publisher Copyright:
© 2021, The Author(s).

Keywords

  • Cyclostratigraphy
  • Geophysical downhole logging
  • Indo Pacific Warm Pool
  • Lake Towuti
  • Paleoclimate

Continental Scientific Drilling Facility tags

  • TDP

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