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Carbonates and Evaporites

, Volume 4, Issue 2, pp 177–194 | Cite as

Compositional zoning characteristics of late dolomite cement in the cambrian bonneterre formation, Missouri: Implications for parent fluid migration pathways

  • M. R. Farr
Article

Abstract

Four major luminescent zones within dolomite cement of the Cambrian Bonneterre Formation can be recognized throughout much of southern Missouri. In the most complete zoning sequence, each of the first three major zones consists of an inner portion of dully luminescent (Fe-enriched) cement and an outer portion which is more brightly luminescent (Fe-depleted) and complexly banded. Manganese and iron determined by electron microprobe vary sympathetically within the zoning sequence, and the major control on luminescence is the absolute concentration of iron which quenches luminescence. Both the minor element variation and presence of dissolution surfaces within the cement are consistent with the zones forming from cyclical “pulses” of fluids originating in the source basin.

The vertical variation in the number of luminescent growth bands in the Bonneterre is controlled by the presence of shaly horizons which acted as barriers to fluid flow. The number of observable growth bands and the proportion of iron-dampened luminescent bands within shale-defined subunits of the Bonneterre show similar regional variation. Both parameters decrease westward from the northwestern margin of the Mississippi Embayment and northward from south-central Missouri.

These regional trends imply that parent fluids entered the region from the east and the south. The southerly source for fluids was probably the Arkoma Basin. The eastern source could have been either the Reelfoot Rift depression to the southeast or the Illinois Basin to the northeast. If fluids entered from the Reelfoot Rift, the ultimate source for these fluids could have been the Ouachita-Arkoma Basin, which may have been open to the Reelfoot Rift during much of the Paleozoic.

Keywords

Dolomite Growth Band Compositional Zoning EX11 Dolomite Cement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 1989

Authors and Affiliations

  • M. R. Farr
    • 1
  1. 1.Department of Geological SciencesThe University of Texas at AustinAustin

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