Diagenesis makes the impossible come true: intersecting beds in calcareous turbidites

Journal article
(Original article)


Publication Details

Author(s): Westphal H, Lavi J, Munnecke A
Journal: Facies
Publisher: Springer Verlag
Publication year: 2015
Volume: 61
Journal issue: 2
ISSN: 0172-9179
Language: English


Abstract


Constructing a time-frame of the past is fundamental for any geological interpretation, and the recognition of orbital cycles preserved in the stratigraphic record has revolutionized our understanding of the global timescale, especially for the Cenozoic. In the past decades, astrochronological and cyclostratigraphic approaches based on Milankovitch cycles have become a widely used tool for precisely dating stratigraphic boundaries by calibrating sedimentary units with astronomically tuned timescales. In many cases, strikingly rhythmic limestone-marl alternations are used for such approaches. Astrochronological approaches as a basic principle rely on the fundamental assumption that such rhythmites reflect fluctuating environmental conditions caused by variations in incident solar radiation such as changes in sea level, temperature, or weathering. Nevertheless, in many cases, the crucial question as to whether such rhythmites represent primary cycles or are purely of diagenetic origin has never been positively decided. In those cases, stratigraphic dating with this method is left unreliable. Here, the ability of diagenesis to produce rhythmic bedding lacking any relation to primary sedimentary signals is demonstrated. The Miocene succession discussed here shows two cemented sets of beds with different inclinations, one parallel to the sedimentary layering, the other, coeval, but in an oblique direction. These two sets merge and do not show distinct boundaries, thus indicating synchronous cementation. It is interpreted that minor early synsedimentary tectonic stress introduced an oblique anisotropy. During early differential diagenesis, this dual anisotropy influenced the geometry of the cemented layers, giving the impression of intersecting layers.



FAU Authors / FAU Editors

Munnecke, Axel Prof. Dr.
Professur für Paläontologie (Schwerpunkt Faziesanalyse)


External institutions
Universität Bremen
University of Manchester


How to cite

APA:
Westphal, H., Lavi, J., & Munnecke, A. (2015). Diagenesis makes the impossible come true: intersecting beds in calcareous turbidites. Facies, 61(2). https://dx.doi.org/10.1007/s10347-015-0427-7

MLA:
Westphal, Hildegard, Jonathan Lavi, and Axel Munnecke. "Diagenesis makes the impossible come true: intersecting beds in calcareous turbidites." Facies 61.2 (2015).

BibTeX: 

Last updated on 2018-08-08 at 11:38