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Modern analogs for ancient transpressional basin sedimentary deposits

Modern analogs for ancient transpressional basin sedimentary deposits. Evan Kelly. Outline. The Walden Creek Group Stratigraphy Olistostrome definition Tectonic Setting? Modern transtensional basins Sea of Marmara Korea Baja California Conclusions: do they match?.

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Modern analogs for ancient transpressional basin sedimentary deposits

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  1. Modern analogs for ancient transpressional basin sedimentary deposits Evan Kelly

  2. Outline • The Walden Creek Group • Stratigraphy • Olistostrome definition • Tectonic Setting? • Modern transtensional basins • Sea of Marmara • Korea • Baja California • Conclusions: do they match?

  3. Walden Creek Group – Blue Ridge Wilhite – 1000 m sandy silt/cgl carbonate olistostromes Shields- 750 m white pbl cgl + lenses course ss Licklog – 100 m siltstone / shale

  4. Olistostromes An accumulation of submarine gravity flows as (semi-fluid bodies) Lack true bedding, yet are intercalated between normal sedimentary bedding sequences. http://bio-geo-terms.blogspot.com/2006/12/mlange.html http://en.wikipedia.org/wiki/File:Olistolite_Western_Serbia.JPG

  5. Walden Creek Group: Age Wilhite – fossils in olistostromes Unrug et al 2000

  6. Unrug et al 2000 Wu et al. 2009

  7. Sea of Marmara • Korea • Gulf of California Modern Transtensional Basins http://statelibrary.ncdcr.gov/colls/themes/april.html

  8. Anatolia http://en.wikipedia.org/wiki/North_Anatolian_Fault Carton et al. 2007

  9. Anatolia http://en.wikipedia.org/wiki/North_Anatolian_Fault Carton et al. 2007

  10. Anatolia – Sea of Marmara Wong et al 1995

  11. Anatolia – Sea of Marmara Wong et al 1995

  12. Anatolia – Sea of Marmara Wong et al 1995

  13. South Korea Chough et al. 2010

  14. SW S. Korea - Eumsung Basin SE

  15. Gulf of California

  16. Gulf of CA - San Jose Island Umhoefer et al. 2007

  17. Basin geometry is central to the expected facies patterns in transtensional basins • Olistostromes reasonable IF rapid change in fault offset • Otherwise, don't match other megabreccias • On what was WCG deposited? • How much of WCG is missing? Conclusions/Further Issues

  18. References • Carton, H., Singh, S.C., Hirn, A., Bazin, S., de Voogd, B., Vigner, A., Ricolleau, A., Cetin, S., Ocakoglu, N., Karakoc, F., Sevilgen, V., 2007. Seismic imaging of the three-dimensional architecture of the Cinarcik Basin along the North Anatolian Fault. Journal of Geophysical Research 112, 1-17. • Ryang, W.H., 2003. Contrasting basin fills in a strike-slip setting, Eumsung Basin, Korea. Geosciences Journal 7, 263-275. • Ryang, W.H., Chough, S.K., 1999. Alluvial-to-lacustrine systems in a pull-apart margin: southwestern Eumsung Basin, Korea. Sedimentary Geology 127, 31-46. • Umhoefer, P.J., Schwennicke, T., Del Margo, M.T., Ruiz-Geraldo, G., Ingle, J.C.J., McIntosh, W., 2007. Transtensional fault-termination basins: an important basin type illustrated by the Pliocene San Jose Island basin and related basins in the southern Gulf of California, Mexico. Basin Research 19, 297-322. • Unrug, R., Ausich, W.I., Bednarczyk, J., Cuffey, R.J., Mamet, B.L., Palmes, S.L., Unrug, S., 2009. Paleozoic age of the Walden Creek Group, Ocoee Supergroup, in the western Blue Ridge, southern Appalachians: Implications for evolution of the Appalachian margin of Laurentia. Geological Society of America Bulletin 112, 982-996. • Wong, H.K., Ludmann, T., Ulug, A., Gorur, N., 1995. The Sea of Marmara: a plate boundary sea in an escape tectonic regime. Tectonophysics 244, 231-250. • Wu, J.E., McClay, K., Whitehouse, P., Dooley, T., 2009. 4D analogue modelling of transtensional pull-a-apart basins. Marine and Petroleum Geology 26.8, 1608-1623.

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