Quaternary environmental changes in tropical Lake Towuti, Indonesia, inferred from end‐member modelling of X‐ray fluorescence core‐scanning data

Morlock, Marina A.; Vogel, Hendrik; Russell, James M.; Anselmetti, Flavio S.; Bijaksana, Satria (2021). Quaternary environmental changes in tropical Lake Towuti, Indonesia, inferred from end‐member modelling of X‐ray fluorescence core‐scanning data. Journal of quaternary science JQS, 36(6), pp. 1040-1051. Wiley 10.1002/jqs.3338

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Continental and marine sediments are composed of a mixture from different sources and are influenced by a variety of environmental factors and transport processes prior to deposition. For analysis and interpretation, these sources and processes are often challenging to disentangle. We show that end-member modelling of X-ray fluorescence (XRF) core-scanning data helps to overcome these challenges by unmixing different environmental signals from high-resolution sediment geochemical records. We apply this approach to a 100 m long lacustrine succession from Lake Towuti, Indonesia, to separate the regional climate and tectonic history from local ecological and diagenetic processes. The resulting six end-members (EMs) are interpreted to represent changes in ecological (EM1), climatic (EMs 2–4), tectonic (EM 5) and geomorphic (EM6) processes determining changes in sediment composition. Because end-member analysis allows for the tracking of transient and overlapping processes, climatic changes can be followed throughout the 100 m-long succession, suggesting alternating wet and dry periods in Central Sulawesi over long (several 100 000 years) time scales. We show that end-member analysis on elemental data sets offers a detailed and objective means to disentangle depositional processes in sedimentary successions resulting from varying tectonic and environmental factors involved in sediment formation and deposition.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Morlock, Marina Alexandra; Vogel, Hendrik and Anselmetti, Flavio S.

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0267-8179

Publisher:

Wiley

Language:

English

Submitter:

Hendrik Vogel

Date Deposited:

14 Jul 2021 15:02

Last Modified:

03 Aug 2021 01:34

Publisher DOI:

10.1002/jqs.3338

BORIS DOI:

10.48350/157549

URI:

https://boris.unibe.ch/id/eprint/157549

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