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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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Presentation Transcript
outline
Outline
  • The Walden Creek Group
    • Stratigraphy
    • Olistostrome definition
    • Tectonic Setting?
  • Modern transtensional basins
    • Sea of Marmara
    • Korea
    • Baja California
  • Conclusions: do they match?
walden creek group blue ridge
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

olistostromes
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

walden creek group age
Walden Creek Group: Age

Wilhite – fossils in olistostromes

Unrug et al 2000

slide6

Unrug et al 2000

Wu et al. 2009

modern transtensional basins

Sea of Marmara

  • Korea
  • Gulf of California
Modern Transtensional Basins

http://statelibrary.ncdcr.gov/colls/themes/april.html

anatolia
Anatolia

http://en.wikipedia.org/wiki/North_Anatolian_Fault

Carton et al. 2007

anatolia1
Anatolia

http://en.wikipedia.org/wiki/North_Anatolian_Fault

Carton et al. 2007

south korea
South Korea

Chough et al. 2010

gulf of ca san jose island
Gulf of CA - San Jose Island

Umhoefer et al. 2007

conclusions further issues

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
references
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.