nerc.ac.uk

Evaluation of mumiyo deposits from East Antarctica as archives for the Late Quaternary environmental and climatic history

Berg, S.; Melles, M.; Hermichen, W.-D.; McClymont, E.L.; Bentley, M.J.; Hodgson, Dominic A. ORCID: https://orcid.org/0000-0002-3841-3746; Kuhn, G.. 2019 Evaluation of mumiyo deposits from East Antarctica as archives for the Late Quaternary environmental and climatic history. Geochemistry, Geophysics, Geosystems, 20 (1). 260-276. 10.1029/2018GC008054

Before downloading, please read NORA policies.
[thumbnail of Berg_et_al-2019-Geochemistry,_Geophysics,_Geosystems.pdf]
Preview
Text
©2018. American Geophysical Union. All Rights Reserved
Berg_et_al-2019-Geochemistry,_Geophysics,_Geosystems.pdf - Published Version
Available under License Creative Commons Attribution 4.0.

Download (8MB) | Preview

Abstract/Summary

Mumiyo deposits form in the vicinity of snow petrel (Pagodroma nivea) nesting sites and consist of fossil stomach oil (mumiyo), guano, and minerogenic material. Here we evaluate mumiyo deposits from the inland mountain ranges of central Dronning Maud Land as high‐resolution archives for paleoenvironmental reconstructions in Antarctica. Investigation of internal structures and chemical composition shows that the lamination reflects progressive sedimentation, despite the irregular outer morphology of the deposits. Detailed radiocarbon analysis demonstrates that stratigraphies are intact: 14C ages become successively younger upwards in the deposits. Fatty acid and n‐alcohol composition was determined on samples from eight mumiyo deposits. Dominance of low molecular weight compounds (C14 to C18) points to a dietary signal; however, the relatively low proportions of unsaturated compounds compared to fresh stomach oils indicates some postdepositional degradation. We found marine diatoms in the mumiyo, which potentially provide a proxy for sea ice conditions in the foraging habitat of the petrels. Age ranges of the investigated deposits suggest occupation of the analyzed sites by snow petrels from 17 ka to >58 ka. Changes in deposition rates point to higher occupation frequency in Petermann Range from 46 to 42 ka compared to the late marine isotope stage 3 and the Last Glacial Maximum.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2018GC008054
ISSN: 15252027
Additional Keywords: mumiyo, paleoecology, Dronning Maud land, polynyas, MIS3, snow petrels
Date made live: 22 Jan 2019 13:32 +0 (UTC)
URI: https://nora.nerc.ac.uk/id/eprint/522063

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...