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Correlating Mediterranean shallow water deposits with global Oligocene-Miocene stratigraphy and oceanic events.

Reuter M, Piller WE, Brandano M, Harzhauser M - Glob Planet Change (2013)

Bottom Line: However, the time resolution of most neritic carbonate records is not high enough to be compared with climatic events as recorded in the deep-sea sediment archives.Integrated multi-proxy and facies analyses indicate that CaCO3 and total organic carbon contents as well as gamma-ray display only local to regional processes on the carbonate platform and are not suited for stratigraphic correlation on a wider scale.In contrast, new biostratigraphic data correlate the Decontra stable carbon isotope record to the global deep-sea carbon isotope record.

View Article: PubMed Central - PubMed

Affiliation: Institute for Earth Sciences, University of Graz, Heinrichstrasse 26, 8010 Graz, Austria.

ABSTRACT

Shallow-marine sediment records have the strong potential to display sensitive environmental changes in sedimentary geometries and skeletal content. However, the time resolution of most neritic carbonate records is not high enough to be compared with climatic events as recorded in the deep-sea sediment archives. In order to resolve the paleoceanographic and paleoclimatic changes during the Oligocene-Miocene transition in the Mediterranean shallow water carbonate systems with the best possible time resolution, we re-evaluated the Decontra section on the Maiella Platform (central Apennines, Italy), which acts as a reference for the correlation of Oligocene-Miocene shallow water deposits in the Mediterranean region. The 120-m-thick late Oligocene-late Miocene carbonate succession is composed of larger foraminiferal, bryozoan and corallinacean limestones interlayered with distinct planktonic foraminiferal carbonates representing a mostly outer neritic setting. Integrated multi-proxy and facies analyses indicate that CaCO3 and total organic carbon contents as well as gamma-ray display only local to regional processes on the carbonate platform and are not suited for stratigraphic correlation on a wider scale. In contrast, new biostratigraphic data correlate the Decontra stable carbon isotope record to the global deep-sea carbon isotope record. This links relative sea level fluctuations, which are reflected by facies and magnetic susceptibility changes, to third-order eustatic cycles. The new integrated bio-, chemo-, and sequence stratigraphic framework enables a more precise timing of environmental changes within the studied time interval and identifies Decontra as an important locality for correlating not only shallow and deep water sediments of the Mediterranean region but also on a global scale.

No MeSH data available.


Related in: MedlinePlus

Lithological log and multi-proxy trends. The colours of the depositional units correspond to the informal lithostratigraphic units in Fig. 1.
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f0015: Lithological log and multi-proxy trends. The colours of the depositional units correspond to the informal lithostratigraphic units in Fig. 1.

Mentions: The measured section of the Bolognano Formation (Fig. 3) starts with a 32-m-thick depositional unit of bioclastic packstones, grainstones and rudstones dominated by lepidocyclinids and other larger benthic foraminifers (Amphistegina, nummulitids; Lepidocyclina Limestone; Fig. 4a) that is unconformably overlying Eocene limestones. Small benthic foraminifers and abraded bryozoan, mollusc, echinoderm and corallinacean fragments are associated. The lower part of the Lepidocyclina Limestone (0–21 m in the section) is characterized by moderate angle (20–30°) cross-bedding (Fig. 5a) and the occurrence of Nephrolepidina praemarginata. In contrast, its upper part shows low-angle (< 10°) planar cross-stratification and an upsection increasing amount of planktonic foraminifers. Nephrolepidina morgani replaces N. praemarginata in this part of the section.


Correlating Mediterranean shallow water deposits with global Oligocene-Miocene stratigraphy and oceanic events.

Reuter M, Piller WE, Brandano M, Harzhauser M - Glob Planet Change (2013)

Lithological log and multi-proxy trends. The colours of the depositional units correspond to the informal lithostratigraphic units in Fig. 1.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4376058&req=5

f0015: Lithological log and multi-proxy trends. The colours of the depositional units correspond to the informal lithostratigraphic units in Fig. 1.
Mentions: The measured section of the Bolognano Formation (Fig. 3) starts with a 32-m-thick depositional unit of bioclastic packstones, grainstones and rudstones dominated by lepidocyclinids and other larger benthic foraminifers (Amphistegina, nummulitids; Lepidocyclina Limestone; Fig. 4a) that is unconformably overlying Eocene limestones. Small benthic foraminifers and abraded bryozoan, mollusc, echinoderm and corallinacean fragments are associated. The lower part of the Lepidocyclina Limestone (0–21 m in the section) is characterized by moderate angle (20–30°) cross-bedding (Fig. 5a) and the occurrence of Nephrolepidina praemarginata. In contrast, its upper part shows low-angle (< 10°) planar cross-stratification and an upsection increasing amount of planktonic foraminifers. Nephrolepidina morgani replaces N. praemarginata in this part of the section.

Bottom Line: However, the time resolution of most neritic carbonate records is not high enough to be compared with climatic events as recorded in the deep-sea sediment archives.Integrated multi-proxy and facies analyses indicate that CaCO3 and total organic carbon contents as well as gamma-ray display only local to regional processes on the carbonate platform and are not suited for stratigraphic correlation on a wider scale.In contrast, new biostratigraphic data correlate the Decontra stable carbon isotope record to the global deep-sea carbon isotope record.

View Article: PubMed Central - PubMed

Affiliation: Institute for Earth Sciences, University of Graz, Heinrichstrasse 26, 8010 Graz, Austria.

ABSTRACT

Shallow-marine sediment records have the strong potential to display sensitive environmental changes in sedimentary geometries and skeletal content. However, the time resolution of most neritic carbonate records is not high enough to be compared with climatic events as recorded in the deep-sea sediment archives. In order to resolve the paleoceanographic and paleoclimatic changes during the Oligocene-Miocene transition in the Mediterranean shallow water carbonate systems with the best possible time resolution, we re-evaluated the Decontra section on the Maiella Platform (central Apennines, Italy), which acts as a reference for the correlation of Oligocene-Miocene shallow water deposits in the Mediterranean region. The 120-m-thick late Oligocene-late Miocene carbonate succession is composed of larger foraminiferal, bryozoan and corallinacean limestones interlayered with distinct planktonic foraminiferal carbonates representing a mostly outer neritic setting. Integrated multi-proxy and facies analyses indicate that CaCO3 and total organic carbon contents as well as gamma-ray display only local to regional processes on the carbonate platform and are not suited for stratigraphic correlation on a wider scale. In contrast, new biostratigraphic data correlate the Decontra stable carbon isotope record to the global deep-sea carbon isotope record. This links relative sea level fluctuations, which are reflected by facies and magnetic susceptibility changes, to third-order eustatic cycles. The new integrated bio-, chemo-, and sequence stratigraphic framework enables a more precise timing of environmental changes within the studied time interval and identifies Decontra as an important locality for correlating not only shallow and deep water sediments of the Mediterranean region but also on a global scale.

No MeSH data available.


Related in: MedlinePlus