Sedimentary and Diagenetic Features in the Sulfide-Bearing Sedimentary Dikes and Strata of Lower Ordovician Dolomites, Decaturville, Missouri, U.S.A.

  • R. A. Zimmermann
  • A. C. Spreng
Conference paper


Additional studies of the Decaturville cryptovolcanic structure in western Missouri, USA, in a new exposure, has revealed additional information on distribution of sulfide minerals and sedimentary features associated with this structure.

The new roadcut exposes a nearly complete section of the Lower Ordovician Jefferson City and Cotter dolomites, permitting detailed examination of features about two km from the center of the structure along the inner margin of the ring fault which surrounds the structure.

The formations consist almost entirely of dolomite with some sandstone, shale, and chert. Sandstones, in beds from 3 to 300 cm thick in this area, and breccias are interpreted to mean a closer proximity to the source area than other exposures in the Ozarks. In addition, the beds have a cyclic arrangement, whose pattern suggests oscillation from very shallow marine conditions to subaerial exposure. This feature is also not apparent in exposure in the Ozarks although poorer exposures may have obscured necessary details in other places.

Sulfides occur both as stratiform blebs in a few layers and more particularly within the matrix and some breccia clasts in sedimentary dikes which occur in the upper part of the section. They make about 1% of the volume of the dike, sufficient to give the dikes a gray to dark gray color.

The sulfides of the dikes consist of pyrite, marcasite, some galena and sphalerite. The sulfides occur in the following forms: (1) pyrite and marcasite spheres, containing framboids, (2) fragments of pyrite-marcasite with porous pyrite framboids, (3) isolated pyrite framboids, (4) minute fragments of fine-grained marcasite, pyrite or mixed pyrite-marcasite fragments, (5) fragments of colloform pyrite, (6) limonite-coated colloform pyrite fragments, and (7) fragments of sphalerite(?). Each of these occurrences is illustrated and a paragenetic sequence for these is given.

It is postulated that the sulfides were transported into the dikes as detritals along with detrital sand and clay from source beds which can be defined for most dikes.


Iron Sulfide Pyrite Framboids Diagenetic Feature Breccia Clast Argillaceous Sandstone 
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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  1. Amstutz GC (1964) Impact, cryptoexplosion, or diapiric movements? (A discussion of the origin of polygonal fault patterns in the Precambrian and overlying rocks in Missouri and elsewhere). Kansas Acad Sci Trans 67 /2: 343–356CrossRefGoogle Scholar
  2. Amstutz GC, Ramdohr P, El Baz F, Park WC (1964) Diagenetic behaviour of sulphides. In: Amstutz GC (ed) Sedimentology and ore genesis. Developments in sedimentology, 2. Elsevier, Amsterdam, pp 65–90CrossRefGoogle Scholar
  3. Beales FW, Lozej GP (1975) Ordovician tidalites in unmetamorphosed sedimentary fill of the Brent meteorite crater, Ontario. In: Ginsburg RN (ed) Tidal deposits. Springer, Berlin Heidelberg New York, pp 315–323Google Scholar
  4. Berner RA (1964a) Iron sulfides formed from aqueous solution at low temperatures and atmospheric pressure. J Geol 72: 293–306CrossRefGoogle Scholar
  5. Berner RA (1964b) Stability fields of iron minerals and anaerobic marine sediments. J Geol 72: 826–834CrossRefGoogle Scholar
  6. Berner RA (1968) Calcium carbonate concretions formed by the decomposition of organic matter. Science (Wash DC) 159: 195–197CrossRefGoogle Scholar
  7. Berner RA (1981) Authigenic mineral formation resulting from organic matter decomposition in modern sediments. Fortschr Mineral 59: 117–135Google Scholar
  8. Boctor NZ, Kullerud G, Sweany JL (1976) Sulfide minerals in Seelyville coal III, Chinook Mine, Indiana. Mineral Deposita 11: 249–266CrossRefGoogle Scholar
  9. Buerger MJ (1934) The pyrite-marcasite relation. Am Mineral 19: 37–61Google Scholar
  10. Craig JR, Scott SD (1974) Sulfide phase equilibria. In: Ribbe PH (ed) Sulfide mineralogy. Mineral Soc Am Short Course Notes, vol 1:CS1–CS110Google Scholar
  11. Cressman ER (1981) Surface geology of the Jeptha Knob cryptoexplosion structure, Shelby County, Kentucky. US Geol Sury Prof Pap 1151-B: 16Google Scholar
  12. Dake CL (1921) The problem of the St Peter Sandstone. University of Missouri-Sch of Mines and Metal Tech Ser: 6 No 1Google Scholar
  13. Fenton CL, Fenton MA (1937) Belt series of the north: stratigraphy, sedimentation, paleontology. Geol Soc Am Bull 48: 1837–1970Google Scholar
  14. Gansser A (1960) Über Schlammvulkane und Salzdome. Vierteljahresschrift Naturforsch Ges Zürich 105: 1–46Google Scholar
  15. Gephard PL (1973–1974) Origin of dolomite and distribution of stromatolites of the Jefferson City Formation, Cole County, Missouri. Trans Mo Acad Sci 7–8: 189–193Google Scholar
  16. Logan BW, Rezak R, Ginsburg RN (1964) Classification and environmental significance of algal stromatolites. J Geol 72: 68–83CrossRefGoogle Scholar
  17. Love LG (1967) Early diagenetic iron sulphide in Recent sediments of the Wash (England). Sedimentology 9: 327–352CrossRefGoogle Scholar
  18. Nichols CE (1977) Geology of the southern half of the Stoutland, Missouri Quadrangle. University Missouri, Rolla, PhD DissGoogle Scholar
  19. Norton WH (1971) A classification of breccias. J Geol 25: 160–194CrossRefGoogle Scholar
  20. Offield TW, Pohn HA (1979) Geology of the Decaturville impact structure, Missouri. US Geol Sury Prof Pap 1042: 1–48Google Scholar
  21. Parratt RL, Kullerud G (1979) Sulfide minerals in coal bed V, Minnehaha Mine, Sullivan County, Indiana. Mineral Deposita 14: 195–206CrossRefGoogle Scholar
  22. Shrock RR (1948) Sequence in layered rocks. McGraw-Hill, New York, 507 pGoogle Scholar
  23. Snyder FG, Gerdemann PE (1965) Explosive igneous activity along an Illinois-Missouri-Kansas axis. Am J Sci 263: 465–493CrossRefGoogle Scholar
  24. Snyder FG, Odell JW (1958) Sedimentary breccias in the southeast Missouri lead district. Geol Soc Am Bull 69: 899–925CrossRefGoogle Scholar
  25. Sweeney RE, Kaplan IR (1973) Pyrite framboid formation: laboratory synthesis and marine sediments. Econ Geol 68: 618–634CrossRefGoogle Scholar
  26. Wilshire HG, Offield TW, Howard KA, Cummings D (1972) Geology of the Sierra Madera cryptoexplosion structure, Pecos County, Texas. US Geol Sury Prof Pap 599-H: 42Google Scholar
  27. Zimmermann RA (1976) The Cambro-Ordovician fossil mud volcano of Decaturville, Missouri. Proc Vulcanism, vol 3. Int congr on thermal waters, geothermal energy and vulcanism of the Mediterranean area, Athens, Greece, pp 265–279Google Scholar
  28. Zimmermann RA, Amstutz GC (1965) The polygonal structure at Decaturville, Missouri: new tectonic observations. Neues Jahrb Mineral Monatsh 1965: 288–307Google Scholar
  29. Zimmermann RA, Amstutz GC (1972) The Decaturville sulfide breccia — a Cambro-Ordovician mud volcanoe. Chemie Erde 31: 253–274Google Scholar
  30. Zimmermann RA, Amstutz GC (1973) Intergrowth and crystallization features in the Cambrian mud volcanoe of Decaturville, Missouri, USA. In: Amstutz GC, Bernard AJ (eds) Ores in sediments (Int Union of Geol Sci Ser A, No 3 ). Springer, Berlin Heidelberg New York, pp 339–350Google Scholar
  31. Zimmermann RA, Amstutz GC (1979) Tectonic features in the polygonal structure of Decaturville, west-central Missouri. Neues Jahrb Mineral Monatsh 1979: 443–470Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1984

Authors and Affiliations

  • R. A. Zimmermann
    • 1
  • A. C. Spreng
    • 2
  1. 1.Mineralogisch-Petrographisches Institut der UniversitätHeidelbergGermany
  2. 2.Department of Geology and Geophysics, School of Mines and MetallurgyUniversity of Missouri-RollaRollaUSA

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