Emerging Cycles: Diagenesis caught in the act.

Reuning, Lars, Reijmer, John and Mattioli, E. (2006) Emerging Cycles: Diagenesis caught in the act. Sedimentology, 53 (4). pp. 849-866. DOI 10.1111/j.1365-3091.2006.00799.x.

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Abstract

Organic biomarker and nannofossil assemblages are used in combination with sedimentary petrology to identify the role of diagenesis for the formation of a rhythmic calcareous succession. A record from the Early Pliocene of the Maldives (Ocean Drilling Program, ODP Leg 115) is presented containing precession and eccentricity cycles expressed as variable aragonite content. Additional sub-Milankovitch cycles are caused by rhythmic precipitation of calcite cement in the lower part of the interval. Comparison with palaeo-productivity indicators (nannofossils, chlorin, total organic carbon) suggests that cementation occurs preferentially in intervals characterized by increasing or decreasing productivity. The coupled variability in productivity and carbonate diagenesis is attributed to the effect of organic matter degradation in the sediment. The observed combination of primary and diagenetic factors hampers the interpretation of the cyclicity on Milankovitch and sub-Milankovitch scales. Diagenetically stable proxies for palaeo-productivity, such as nannofossil assemblage data, were used to distinguish between palaeoclimate and diagenetic influences.

Document Type: Article
Keywords: Cyclic processes; cyclostratigraphy; differential diagenesis; Maldive Islands;oxidation zone; periplatform carbonates; ODP Leg 115
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1111/j.1365-3091.2006.00799.x
ISSN: 0037-0746
Projects: ODP
Date Deposited: 03 Dec 2008 16:52
Last Modified: 17 Jul 2018 12:23
URI: http://oceanrep.geomar.de/id/eprint/6425

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