Holocene lake development and glacial-isostatic uplift at Lake Skallen and Lake Oyako, Lützow-Holm Bay, East Antarctica: Based on biogeochemical facies and molecular signatures

Yoshinori Takano, Jonathan James Tyler, Hisaya Kojima, Yusuke Yokoyama, Yukiko Tanabe, Takaharu Sato, Nanako O. Ogawa, Naohiko Ohkouchi, Manabu Fukui

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The paleolimnology of two lakes which were isolated as a result of the crustal uplift during the late Holocene along the Soya Coast, Lützow-Holm Bay, East Antarctica were studied. The focus was on temporal variations in the biogeochemical composition of sediment cores recovered from Lake Skallen at Skallen and Lake Oyako at Skarvsnes. Both sets of lake sediments record environmental changes associated with a transition from marine to lacustrine settings, as indicated by analyses of C and N contents, nitrogen isotopic compositions (δ 15N), and major element concentrations. Changes in the dominant primary producers during the marine-lacustrine transition (marine diatom to cyanobacteria) at L. Skallen was clearly revealed by biogenic opal-A, diatom assemblages, and molecular signature from denaturing gradient gel electrophoresis (DGGE) with 16S ribosomal RNA (rRNA) gene analysis. Radiocarbon dating of acid-insoluble organic C suggested that the environmental transition from marine to fresh water occurred at 2940±100calyr BP at L. Skallen and 1060±90calyr BP at L. Oyako. Based on these data, a mean crustal uplift rate of 3.2mmyr -1 is inferred for the history of marine-lacustrine transition via brackish conditions. The geological setting causing glacio-isostatic uplift was the primary factor in controlling the transition event in sedimentary and biological facies.

Original languageEnglish
Pages (from-to)2546-2559
Number of pages14
JournalApplied Geochemistry
Volume27
Issue number12
DOIs
Publication statusPublished - 2012 Dec

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Geochemistry and Petrology

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