The "chimney forest" of the deep Montenegrin margin, south-eastern Adriatic Sea

L. Angeletti, S. Canese, F. Franchi, P. Montagna, J. Reitner, E. O. Walliser, M. Taviani

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    A spectacular field of columnar carbonates has been discovered on the Montenegrin margin in the southern Adriatic Sea at a depth of about 450 m. The site exposes many columnar carbonates protruding from the substrate or abated on the bottom. Such carbonates attain maximum visible lengths of ca. 60 cm with diameters up to 20 cm; display an annular growth, and are either hollow or plugged by indurated sediment. Petrographic and geochemical analyses document the pervasive presence of dolomite, and δ13C values as low as -30‰ VPDB. These 'chimneys' are therefore interpreted as former conduits related to hydrocarbon expulsion in this sector of the Adriatic basin. However, available data suggest that hydrocarbon flows at this site have ceased. Our results show that chimneys formed inside the local depositional units, glacial Pleistocene shelf shelly-rich muddy sediment and were successively exhumed from the host sediment. Today, the chimneys offer substrate to benthic life, including cold water corals and sponges. The U-series dating of these carbonate concretions is complicated by the presence of a significant fraction of detrital sediment, which represents a major source of initial 230Th. AMS-14C and 87Sr/86Sr dating of shells embedded in one of the chimney provided ages beyond the range of radiocarbon dating and <600 kyrs, indicating a Pleistocene age of the host sediment. Uncorrected U-series dating of the carbonate chimneys yielded and age of ca. 250-270 kyrs, providing a temporal upper limit for conduit formation driven by lithification caused by the degradation of seeping hydrocarbons. In addition, U/Th dating of cold water coral bases settled on chimneys indicates a Holocene age for their first exposure after exhumation and subsequent function as hard substrate for benthic organisms. The Montenegrin 'chimney forest' is a rare case where many such carbonate columnar concretions are still in their original vertical position.

    Original languageEnglish
    Pages (from-to)542-554
    Number of pages13
    JournalMarine and Petroleum Geology
    Volume66
    DOIs
    Publication statusPublished - Sep 1 2015

    Fingerprint

    Adriatic Sea
    chimneys
    margins
    dating
    carbonates
    sediments
    carbonate
    cold water
    sediment
    hydrocarbons
    concretion
    hydrocarbon
    substrate
    coral
    Pleistocene
    lithification
    Alpha Magnetic Spectrometer
    expulsion
    accelerator mass spectrometry
    radiocarbon dating

    All Science Journal Classification (ASJC) codes

    • Oceanography
    • Geophysics
    • Geology
    • Economic Geology
    • Stratigraphy

    Cite this

    Angeletti, L. ; Canese, S. ; Franchi, F. ; Montagna, P. ; Reitner, J. ; Walliser, E. O. ; Taviani, M. / The "chimney forest" of the deep Montenegrin margin, south-eastern Adriatic Sea. In: Marine and Petroleum Geology. 2015 ; Vol. 66. pp. 542-554.
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    The "chimney forest" of the deep Montenegrin margin, south-eastern Adriatic Sea. / Angeletti, L.; Canese, S.; Franchi, F.; Montagna, P.; Reitner, J.; Walliser, E. O.; Taviani, M.

    In: Marine and Petroleum Geology, Vol. 66, 01.09.2015, p. 542-554.

    Research output: Contribution to journalArticle

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    AU - Angeletti, L.

    AU - Canese, S.

    AU - Franchi, F.

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