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Carbonates and Evaporites

, Volume 12, Issue 2, pp 163–176 | Cite as

Dolomitization of the periplatform carbonate slope deposit, the Machari Formation (Middle to Late Cambrian), Korea

  • Gong S. Chung
  • Lynton S. Land
Article

Abstract

An ancient periplatform carbonate slope deposit, the Machari Formation (late Middle to early Late Cambrian), Korea shows five dolomite types of which dolomitization conditions, dolomitizing fluids and recrystallization are closely associated with depositional setting and burial history.

Mosaic dolomite I, uniformly red luminescent hypidiotopic to xenotopic medium- crystalline dolomite, forms massive dolomite rock about 40 m thick. The dolomite shows radiogenic87Sr/86Sr ratios (0.71160), low δ18O(−7.0‰ PDB) and δ13C (0.6‰, PDB) values, low Sr (47 ppm), high Fe (0.22 mol %) and Mn (0.13 mol %) contents. Petrography and geochemistry suggest that the dolomite has been initially formed from seawater in the shallow burial environment and then it was recrystallized by the basin-derived fluids from the underlying Sambangsan Formation in the deep burial setting during the Late Ordovician. Mosaic dolomite II, uniformly red luminescent hypidiotopic to xenotopic medium-crystalline dolomite forms discrete beds in limestone a few tens of cm to a few m in thickness with very radiogenic87Sr/86Sr ratios (0.71547), low δ18O(−8.3‰, PDB) and δ13C (0.8‰, PDB) values, 64 ppm Sr, 0.6 mol % Fe and 0.29 mol % Mn contents is interpreted to have formed by the fluids from crustal rocks in the deep burial setting during the Late Silurian. Patchy ferroan dolomite crystals of a few hundreds of (m to several cm consisting of fine- to medium-crystalline nonluminescent dolomite show an average87Sr/86Sr ratios of 0.71013, −6.3‰δ18O and 1.9‰δ13C values, and 110 ppm Sr, 4.38 mol % Fe and 0.51 mol % Mn contents; it is interpreted to have formed by the fluids from the siliciclastics of the Pyongan Supergroup in the deep burial setting during the Permian. The saddle dolomite, coarse crystalline xenotopic rhombs of severe undulose extinction is seemed to have formed during this orogeny. The disseminated dolomite which shows diverse texture and CL pattern is interpreted to have formed at various times based on cross-cutting relationship with other diagenetic features.

The Machari Formation reveals following aspects of ancient periplatform dolomitization: 1) Seawater was the main source of Mg for the initial dolomitization of ancient periplatform carbonate slope limestone. 2) The basin-derived fluids recrystallized the early dolomite in the deep burial setting. 3) After the initial formation of early dolomite, origin and modification of dolomites were affected by tectonic and burial histories. 4) Dolomitizing fluids were diverse; however, the fluids other than seawater dolomitized the limestone only at limited scale.

Keywords

Dolomite Dolomitization Stylolite Deep Burial Burial History 
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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References

  1. ALLAN, J.R. and WIGGINS, W.D., 1993, Dolomite reservoirs:American Association of Petroleum Geologists Continuing Education Course Note Series, v. 36, 129 p.Google Scholar
  2. BURKE, W.H., DENISON, R.E., HETHERINGTON, E.A., KOEPNICCK, R.B., NELSON, H.F., and OTTO, J.B., 1982, Variation of seawater87Sr/86Sr throughout Phanerozoic time:Geology, v. 10, p. 516–519.CrossRefGoogle Scholar
  3. CHEONG, C.H., 1988, Pyongan Supergroup,in Lee, D.S. (ed.), Geology of Korea. Kyohak-sa Publishing Company and Geological Society of Korea, Seoul, p. 85–148.Google Scholar
  4. CHUNG, G.S. and LEE, E.K., 1992, Late Cambrian carbonate slope deposit, Machari Formation, Korea:Geological Society of America Abstracts with Programs, p. A-141.Google Scholar
  5. CHAUDHURI, S. and CLAUER, N., 1992, Signatures of radiogenic isotopes in deep subsurface waters in continents,in Clauer, N., and Chaudhuri, S. (eds.), Isotopic signatures and sedimentary records. Springer-Verlag, Berlin, p. 497–529.CrossRefGoogle Scholar
  6. CLUZEL, D., CADET, J-P., and LAPIERRE, H., 1990, Geodynamics of the Ogcheon Belt (South Korea):Tectonophysics, v. 183, p. 41–56.CrossRefGoogle Scholar
  7. DICKSON, J.A.D., 1996, Carbonate identification and genesis as revealed by staining:Journal of Sedimentary Petrology, v. 36, p. 491–505.Google Scholar
  8. FRIEDMAN, G.M., 1959, Identification of carbonate minerals by staining methods:Journal of Sedimentary Petrology, v. 29, p. 87–97.Google Scholar
  9. GAO, G. and LAND, L.S., 1991, Early Ordovician Cool Creek Dolomite, Middle Arbuckle Group, Slick Hills, SW Oklahoma, U.S.A.: Origin and modification:Journal of Sedimentary Petrology, v. 61, p. 161–173.CrossRefGoogle Scholar
  10. KIM, O.J., 1988, Tectonic evolution,in Lee, D.S., (ed.), Geology of Korea. Kyohak-sa Publishing Company and Geological Society of Korea, Seoul, p. 253–263.Google Scholar
  11. KOBAYASHI, T., 1966, The Cambrian-Ordovician formations and faunas of South Korea, Part 10, Stratigraphy of the Chosen Group in Korea South Manchuria and its relation to the Cambro-Ordovician Formations of other areas, Sect. A, The Chosen Group of South Korea:Journal of the Faculty of Science, Sec. 2, v. 16, University of Tokyo, p. 1–84.Google Scholar
  12. KOO, K.J., 1992, Dolomitization in the Wagok Formation (Late Cambrian). Unpublished M.S. Thesis, Seoul National University, Seoul, 123 p.Google Scholar
  13. KUPECZ, J.A. and LAND, L.S., 1991, Late-stage dolomitization of the Lower Ordovician Eellenburger Group, west Texas:Journal of Sedimentary Petrology, v. 61, p. 551–574.Google Scholar
  14. LAND, L.S., 1985, The origin of massive dolomite:Journal of Geological Education, v. 33, p. 112–125.CrossRefGoogle Scholar
  15. LEE, E.K., 1993, Depositional environment of the Upper Cambrian Machari Formation in the Machari area, Youngwol-gun, Kangwon-do, Korea. Unpublished M.S. Thesis, Chungnam National University, Taejon, Korea, 83 p. (in Korean).Google Scholar
  16. LEE, H.Y., 1988, Choson Supergroup,in Lee, D.S. (ed.), Geology of Korea. Kyohak-sa Publishing Company and Geological Society of Korea, Seoul, p. 49–85.Google Scholar
  17. MONTANEZ, I.P. and READ, J.F., 1992, Fluid-rock interaction history during stabilization of early dolomites, Upper Knox Group (Lower Ordovician), U.S. Appalachians:Journal of Sedimentary Petrology, v. 62, p. 753–778.Google Scholar
  18. MONTANEZ, I.P., BANNER, J.L., OSLEGER, D.A., BORG, L.E., and BOSSERMAN, P.J., 1996, Integrated Sr isotope variations and sea-level history of Middle to Upper Cambrian platform carbonates: Implications for the evolution of Cambrian seawater87Sr/86Sr:Geology, v. 24, p. 917–920.CrossRefGoogle Scholar
  19. MULLINS, H.T. and COOK, H.E., 1986, Carbonate apron models: Alternatives to the submarine fan model for paleoenvironmental analysis and hydrocarbon exploration:Sedimentary Geology, v. 48, p. 37–79.CrossRefGoogle Scholar
  20. MULLINS, H.T., 1986, Carbonate depositional environments, modern and ancient, Part 4, Periplatform carbonates:Colorado School of Mines Quaterly, v. 81, p. 1–63.Google Scholar
  21. MULLINS, H.T., WISE, S.W., LAND, L.S., SIEGEL, D.I., MASTERS, P.M., HINCHEY, E.J., and PRICE, K.R., 1985, Authigenic dolomite in Bahamian periplatform slope sediment:Geology v. 13, p. 292–295.CrossRefGoogle Scholar
  22. MULLINS, H.T., DIX, G.R., GARDULSKI, A.F., and LAND, L.S., 1988, Neogene deep-water dolomite from the Floridan-Bahamas platform,in Shukla, V., and Baker, P.A., (eds.), Sedimentology and geochemistry of dolostones. Society of Economic Paleontologists and Mineralogists, Special Publication, 43, Tulsa, p. 235–243.Google Scholar
  23. PAIK, I.S., WOO, K.S., and CHUNG, G.S., 1991, Stratigraphic, sedimentologic and paleontologic investigation of the Paleozoic sedimentary rocks in Yeongweol and Gabsan areas: Depositional environments of the Lower Ordovician Mungok Formation in the vicinity of Yeongweol:Journal of the Geological Society of Korea, v. 27, p. 357–370.Google Scholar
  24. PALMER, A.R., 1983, The decade of North American geology, geologic time scale:Geology, v. 11, p. 503–504.CrossRefGoogle Scholar
  25. PARK, B.S., 1982, Tectonic history, in Compilation committee of papers for celebration of retirement of professor O.J. Kim, (ed.), Geology and mineral resources of Korea. Darim Munwha Jeongpansa Publishing Company, Seoul, p. 165–170 (in Korean).Google Scholar
  26. REINEMUND, J.A., 1957, Coalfield of the Republic of Korea, geology of Machari coalfield, pt 2. United States Government Printing Office, Washington, D.C.,Geological Survey Bulletin, 1041-C, 47 p.Google Scholar
  27. TAYLOR, T.R. and SIBLEY, D.F., 1986, Petrographic and geochemical characteristics of dolomite types and the origin of ferroan dolomite in the Trenton Formation, Ordovician, Michigan Basin, U.S.A.:Sedimentology, v. 33, p. 61–86.CrossRefGoogle Scholar
  28. VEIZER, J., 1989, Strontium isotopes in seawater through time:Annual Review of Earth and Planetary Sciences, v. 17, p. 141–167.CrossRefGoogle Scholar
  29. YOO, C.M., 1996, Cyclostratigraphy and dolomitization of the Middle Ordovician Yeongheung Formation, Yeongweol, Korea. Unpublished Ph.D. Dissertation, Seoul National University, Seoul, Korea, p. 187.Google Scholar

Copyright information

© Springer 1997

Authors and Affiliations

  • Gong S. Chung
    • 1
  • Lynton S. Land
    • 2
  1. 1.Department of GeologyChungnam National UniversityTaejonSouth Korea
  2. 2.Department of Geological SciencesUniversity of TexasAustin

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