PRELIMINARY DATA FROM THE FIRST RECORD OF THE EARLY TOARCIAN OCEANIC ANOXIC EVENT IN THE SEDIMENTS OF THE PINDOS ZONE (GREECE)
Περίληψη
The Early Toarcian Oceanic Anoxic Event (ca 183 Ma) coincides with high palaeotemperatures, regional anoxia to euxinia, marine transgression, mass extinction and high rates of organic-carbon burial in a global context. Most of the detailed studies of this event have investigated deposits formed in the epicontinental seas of northern Europe, although coeval organic-rich shales are known locally in the Tethyan region. However, the global or regional character of this event is still under debate. In this study we present, for the first time, a high-resolution geochemical record of the Early Toarcian Oceanic Anoxic event in pelagic sediments (Kastelli Pelites) formed in a long-lived Mesozoic deep-sea basin, corresponding to the western passive margin of the Pindos Ocean of western Greece. Our data record both the positive excursion in total organic carbon (TOC) and the characteristic negative excursion in δ13Ccarb. The δ13Ccarb values are very stable in the bottom of the section (~2‰), whereas higher in the section the values drop down to ~ -5‰. Following this negative excursion, the carbonate carbon-isotope ratios return to background values. The TOC excursion is modest, rising from a background of 0.05% to ~ 2% and then returning to a background of 0.04%. Because both relative enrichment in TOC and the negative carbon-isotope excursion that characterize the Toarcian OAE are recorded in some of the deepest marine sediments of the Tethyan region, the global significance of the event is reinforced.
Λεπτομέρειες άρθρου
- Πώς να δημιουργήσετε Αναφορές
-
Kafousia N., K. N., Karakitsios, V., & Jenkyns, H. (2010). PRELIMINARY DATA FROM THE FIRST RECORD OF THE EARLY TOARCIAN OCEANIC ANOXIC EVENT IN THE SEDIMENTS OF THE PINDOS ZONE (GREECE). Δελτίο της Ελληνικής Γεωλογικής Εταιρείας, 43(2), 627–633. https://doi.org/10.12681/bgsg.11225
- Ενότητα
- Παλαιοντολογία, Στρωματογραφία και Ιζηματολογία
Αυτή η εργασία είναι αδειοδοτημένη υπό το CC Αναφορά Δημιουργού – Μη Εμπορική Χρήση 4.0.
Οι συγγραφείς θα πρέπει να είναι σύμφωνοι με τα παρακάτω: Οι συγγραφείς των άρθρων που δημοσιεύονται στο περιοδικό διατηρούν τα δικαιώματα πνευματικής ιδιοκτησίας επί των άρθρων τους, δίνοντας στο περιοδικό το δικαίωμα της πρώτης δημοσίευσης. Άρθρα που δημοσιεύονται στο περιοδικό διατίθενται με άδεια Creative Commons 4.0 Non Commercial και σύμφωνα με την οποία μπορούν να χρησιμοποιούνται ελεύθερα, με αναφορά στο/στη συγγραφέα και στην πρώτη δημοσίευση για μη κερδοσκοπικούς σκοπούς. Οι συγγραφείς μπορούν να: Μοιραστούν — αντιγράψουν και αναδιανέμουν το υλικό με κάθε μέσο και τρόπο, Προσαρμόσουν — αναμείξουν, τροποποιήσουν και δημιουργήσουν πάνω στο υλικό.
Λήψεις
Τα δεδομένα λήψης δεν είναι ακόμη διαθέσιμα.
Αναφορές
Bailey, T. R., Rosenthal, Y., McArthur, J. M. and van der Schootbrugge, B., 2003. Paleoceanographic
changes of the Late Pliensbachian–Early Toarcian interval: a possible link to the genesis of an
Oceanic Anoxic Event. Earth and Planetary Science Letters 212, 307-320.
XLIII, No 2 – 631
Fig. 3: Lithological column, bulk TOC and stable carbon carbonate-isotope profile for the Kastelli section.
De Wever, P. and Origlia-Devos, I., 1982. Datation par les Radiolaires des niveaux siliceux du Lias de
la Série du Pinde–Olonos (Formation de Drimos, Péloponnèse et Grèce continentale). C. R. Acad.
Sci. Paris, sér. II 294, 1191-1198.
Degnan, P. J. and Robertson, A. H. F., 1998. Mesozoic–early Tertiary passive margin evolution of the
Pindos ocean (NW Peloponnese, Greece). Sedimentary Geology 117, 33-70.
Fleury, J. J., 1980. Les zones de Gavrovo-Tripolitza et du Pinde-Olonos (Grèce continentale et Péloponèse
du nord). Evolution d’une plate-forme et d’un bassin dans leur cadre alpin. Publication Societé
Géol. Nord 4, 1-473.
Hesselbo, S. P., Gröcke, D. R., Jenkyns, H. C., Bjerrum, C. J., Farrimond, P., Morgans Bell, H. S. and
Green, O. R., 2000. Massive dissociation of gas hydrate during a Jurassic oceanic anoxic event. Nature
, 392-395.
Hesselbo, S. P., Jenkyns, H. C., Duarte, L. V. and Oliveira, L. C. V., 2007. Carbon-isotope record of the
Early Jurassic (Toarcian) Oceanic Anoxic Event from fossil wood and marine carbonate (Lusitanian
Basin, Portugal). Earth and Planetary Science Letters 253(3-4), 455.
Jenkyns, H. C., 1988. The early Toarcian (Jurassic) anoxic event: stratigraphic, sedimentary, and geochemical
evidence. American Journal of Science 288, 101-151.
Jenkyns, H. C., 2003. Evidence for rapid climate change in the Mesozoic-Palaeogene greenhouse world.
Phil Trans. R. Soc., Series A 361, 1885-1916.
Jenkyns, H. C. 2010. The geochemistry of Oceanic Anoxic Events. Geochem. Geophys. Geosyst.,
doi:10.1029/2009GC002788, in press.
Jenkyns, H. C. and Clayton, C. J., 1986. Black shales and carbon isotopes in pelagic sediments from
the Tethyan Lower Jurassic. Sedimentology 33, 87-106.
Jenkyns, H. C. and Clayton, C. J., 1997. Lower Jurassic epicontinental carbonates and mudstones from
England and Wales: chemostratigraphic signals and the early Toarcian anoxic event. Sedimentology
, 687-706.
Jenkyns, H.C., Sarti, M., Masetti, D. and Howarth, M.K. 1985. Ammonites and stratigraphy of Lower
Jurassic black shales and pelagic limestones from the Belluno Trough, Southern Alps, Italy. Eclogae
Geologicae Helvetiae, 78, 299-301.
Jenkyns, H. C., Gale, A. S. and Corfield, R. M., 1994. Carbon- and oxygen-isotope stratigraphy of the
English Chalk and Italian Scaglia and its palaeoclimatic significance. Geological Magazine 131,
-34.
Jenkyns, H. C., Gröcke, D. R. and Hesselbo, S. P., 2001. Nitrogen isotope evidence for water mass
denitrification during the Early Toarcian (Jurassic) Oceanic Anoxic Event. Paleoceanography 16,
-603.
Jenkyns, H. C., Jones, C. E., Gröcke, D. R., Hesselbo, S. P. and Parkinson, D. N., 2002. Chemostratigraphy
of the Jurassic System; applications, limitations and implications for palaeoceanography.
Journal of the Geological Society of London 159, 351-378.
Karakitsios, V., 1995. The influence of preexisting structure and halokinesis on organic matter preservation
and thrust system evolution in the Ionian Basin, Northwest Greece. American Association
of Petroleum Geologists Bulletin 79, 960-980.
Kemp, D. B., Coe, A. L., Cohen, A. S. and Schwark, L., 2005. Astronomical pacing of methane release
in the Early Jurassic period. Nature 437, 396-399.
Little, C. T. S. and Benton, M. J., 1995. Early Jurassic mass extinction: A global long-term event. Geology
, 495-498.
Littler, K., Hesselbo, P. S. and H.C., J., 2010. A carbon-isotope perturbation at the Pliensbachian-ToarXLIII,
No 2 – 632
cian boundary: evidence from the Lias Group, NE England. Geological Magazine, doi:
1017/S0016756809990458, in press.
Lyberis, N., Chotin, P. and Doubinger, J., 1980. Précisions stratigraphiques sur la série du Pinde
(Grèce): la durée de sédimentation des «radiolarites». Comptes Rendus de l’ Académie des Sciences,
Paris, série D, 290, 1513-1516.
Rigakis, N. and Karakitsios, V., 1998. The source rock horizons of the Ionian Basin (NW Greece). Marine
and Petroleum Geology 15, 593-617.
Sabatino, N., Neri, R., Bellanca, A., Jenkyns, H. C., Baudin, F., Parisi, G. and Masetti, D., 2009. Carbon-isotope
records of the Early Jurassic (Toarcian) oceanic anoxic event from the Valdorbia (Umbria–Marche
Apennines) and Monte Mangart (Julian Alps) sections: palaeoceanographic and
stratigraphic implications. Sedimentology 56, 1307-1328.
Schlanger, S. O. and Jenkyns, H. C., 1976. Cretaceous oceanic anoxic events: causes and consequences.
Geologie en Mijnbouw 55, 179-184.
Suan, G., Mattioli, E., Pittet, B., Mailliot, S. and Lecuyer, C., 2008. Evidence for major environmental
perturbation prior to and during the Toarcian (Early Jurassic) oveanic anoxic event from the
Lusitanian Basin, Portugal. Paleoceanography 23, PA1202, doi: 10.1029/2007PA001459.
van der Schootbrugge, B., McArthur, J. M., Bailey, T. R., Rosenthal, Y., Wright, J. D. and Miller, G.
K., 2005. Toarcian oceanic anoxic event: An assessment of global causes using belemnite C isotope
records. Paleoceanography 20, PA3008, doi: 10.1029/2004PA001102.
Woodfine, R.G., Jenkyns, H.C., Sarti, M., Baroncini, F. and Violante, C. 2008. The response of two
Tethyan carbonate platforms to the early Toarcian (Jurassic) oceanic anoxic event: environmental
change and differential subsidence. Sedimentology, 55, 1011-1028.
