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    Molecular proxies as indicators of freshwater incursion-driven salinity stratification

    227602_227602.pdf (1.123Mb)
    Access Status
    Open access
    Authors
    Tulipani, Svenja
    Grice, Kliti
    Greenwood, Paul
    Schwark, Lorenz
    Böttcher, M.
    Summons, R.
    Foster, C.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Abstract

    Salinity-related stratification in marine environments is one of the main drivers for the development of persistent anoxia and euxinia. It therefore plays a vital role in the sedimentary preservation of organic matter and has also been associated with Oceanic Anoxic Events during several mass extinctions in Earth's history. Here we present a novel molecular proxy using relative abundances of methyltrimethyltridecylchromans (MTTCs) as indicators of riverine freshwater incursions into Middle to Late Devonian paleoreefs exposed to conditions of prevailing anoxia, photic zone euxinia and water column stratification. This paper aims at re-instigating a discussion about the origin of these compounds to potentially broaden their utilization as paleoproxies, adding freshwater stratification to the general salinity reconstructions. The co-variation of MTTC abundance profiles and δ13C values with other biomarker parameters in the sediments studied here indicate a link of MTTCs to terrigenous input, pointing towards a previously suggested early diagenetic formation of these compounds from phytol with higher plant-derived alkylphenols.

    Citation
    Tulipani, S. and Grice, K. and Greenwood, P. and Schwark, L. and Böttcher, M. and Summons, R. and Foster, C. 2015. Molecular proxies as indicators of freshwater incursion-driven salinity stratification. Chemical Geology. 409: pp. 61-68.
    Source Title
    Chemical Geology
    DOI
    10.1016/j.chemgeo.2015.05.009
    ISSN
    0009-2541
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/34594
    Collection
    • Curtin Research Publications

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