Continent-Ocean Transition Or Boundary? Crowd-Sourced Seismic Interpretations Of The East-India Margin

19TH INTERNATIONAL SYMPOSIUM ON DEEP SEISMIC PROFILING OF THE CONTINENTS AND THEIR MARGINS Continent-Ocean Transition or Boundary? Crowd-sourced seismic Interpretations of the East-India Margin Juan Alcalde, Clare E. Bond, Ramon Carbonell and Rob W.H. Butler On Continental Margins On Continental-Oceanic Boundaries Modified from: Watts and Fairhead (1999) On Continental-Oceanic Boundaries Eagles, G., Pérez-Díaz, L. and Scarselli, N., 2015. Getting over continent ocean boundaries. EarthScience Reviews,151, pp.244-265. The E-India margin On Continental-Oceanic Boundaries Eagles et al., 2015 You ! The E-India margin Eagles et al., 2015 The E-India margin Nemčok et al., 2013 Pindell et al., 2014 Haupert et al., 2016 1–Powell (1998); 2 Krishna et al. (2009); 3 –Rao et al. (1997); 4 – Nemčok;et al. (2013); 5 –Veveers (2009); 6 –Sinha (2010) The E-India margin ? East India line 1-1000 Interpretation Within your group, you are free to interpret the section in any way you wish. Add lines, drawings etc. Label any key features. You can colour in different geological elements. The borders can be used for evolutionary sketches/models etc. To facilitate comparison between the various interpretations arising from the collection of groups, please identify the following features: Different crust (basement) types –continent vs oceanic? Different sedimentary units (e.g. pre-, synand post-tectonic)? The Moho –under the continent, under the ocean and whether/how these connect. Can you identify (and pick) faults? Scale used in the experiment: 1:1 East India line 1-1000 Interpretation Within your group, you are free to interpret the section in any way you wish. Add lines, drawings etc. Label any key features. You can colour in different geological elements. The borders can be used for evolutionary sketches/models etc. To facilitate comparison between the various interpretations arising from the collection of groups, please identify the following features: Different crust (basement) types –continent vs oceanic? Different sedimentary units (e.g. pre-, synand post-tectonic)? The Moho –under the continent, under the ocean and whether/how these connect. Can you identify (and pick) faults? Scale used in the experiment: 1:1 Participants Interpretation examples Interpretation results Heat maps Average interpretations Stretching factor calculations Basement Moho 10000 m A B Crustal Thickness β-factor= A/30 km β-factor= B/30 km … Stretching factor calculations Comparison with other works 1–Powell (1998); 2 Krishna et al. (2009); 3 –Rao et al. (1997); 4 – Nemčok;et al. (2013); 5 –Veveers (2009); 6 –Sinha (2010)