Limestone-Marl Cycles (Periodites): Diagnosis, Significance, Causes — a Review

  • G. Einsele
Conference paper

Abstract

Pelagic to hemipelagic limestone-marl rhythms are described as minor cycles with time information (periodites). They develop and can be recognized in the field only, if (a) the original sediment had a carbonate/clay ratio on the order of 4 and, under oxygenated conditions, if (b) the thickness of somewhat alternating beds was sufficient (5 to 10 cm) to prevent complete mixing by bioturbation. Simple models demonstrate the effect of fluctuating productivity and dissolution of (chiefly biogenic) carbonate as well as its dilution by “clay”. However, small primary differences in carbonate content or texture of alternating beds may be enhanced by diagenesis, including pressure solution, which strongly affect the final field aspect and the faunal content of the rhythmic sequence. Yet there are several criteria to prove the primary origin of such successions.

The exact correlation and timing of limestone-marl sequences is difficult in many cases, but it can hardly be doubted that the time periods of Quaternary and older carbonate cycles coincide in their order of magnitude (20,000 to 100,000 years). This is also true for their sedimentation rate (0.5 to 3 cm/1000 years) which is controlled by pelagic carbonate production.

Limestone-marl rhythms reflect a depositional area below storm-wave base. In the case of continental margins or epicontinental seas, accumulation approximately balances subsidence, and alternating beds appear to be generated mainly by dilution. In the deep sea, cyclic carbonate deposition is found on rises and plateaus, where it is chiefly controlled by dissolution in conjunction with a fluctuating CCD and/or changing bottom currents.

Rhythms of this type occur world-wide since Paleozoic time. They are probably caused by climatic variations, but simultaneous (generally small) sea level fluctuations may also play a part. During periods of widely extented and intensive plant growth on land, the CO2, content of surface waters may have been diminished for some time, whereas the river supply of dissolved old carbonate was increased. Both processes tend to promote the production and preservation of carbonate in shallow and deeper water.

Keywords

Lime Compaction Petrol Holocene Miocene 

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