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Enhanced buckling due to river incision:

Enhanced buckling due to river incision:. the Oxaya Antiform, northern Chile. Gerold Zeilinger, Fritz Schlunegger, Univ. Bern Guy Simpson, ETH Zurich. Outline. Introduction. Examples of transverse rivers intersecting anticlines in compressional belts

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Enhanced buckling due to river incision:

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  1. Enhanced buckling due to river incision: the Oxaya Antiform, northern Chile Gerold Zeilinger, Fritz Schlunegger, Univ. Bern Guy Simpson, ETH Zurich

  2. Outline • Introduction • Examples of transverse rivers intersecting anticlines in compressional belts • Can incision amplify buckling also in active continental margins?

  3. Outline • Introduction • Study area • Geographical position • Tectonic frame • Stratigraphy of important units • Geological overview

  4. Outline • Introduction • Study area • Anticline structure • Oxaya Anticline geometry • Basement – Tertiary units unconformity • Tertiary units fold geometry • Spatial distribution of structures

  5. Outline • Introduction • Study area • Anticline structure • Interpretation • Timing of anticline growth • (River incision history) • (Regional compression)

  6. Outline • Introduction • Study area • Anticline structure • Interpretation • Conclusion •  Does the incision of the studied valleys influence the deformation of the surrounding Oxaya Anticline?

  7. Introduction Worldwide examples

  8. Introduction Worldwide examples • Pyrenees: Segre River at Oliana Anticline

  9. Introduction Worldwide examples • Pyrenees: Segre River at Oliana Anticline • Swiss Alps: Reuss above Lake Lucerne

  10. Introduction Worldwide examples • Pyrenees: Segre River at Oliana Anticline • Swiss Alps: Reuss above Lake Lucerne • French Alps: Fier river at Val du Fier

  11. Introduction Worldwide examples • Pyrenees: Segre River at Oliana Anticline • Swiss Alps: Reuss above Lake Lucerne • French Alps: Fier river at Val du Fier • Himalaya: Arun river

  12. Introduction Worldwide examples • Pyrenees: Segre River at Oliana Anticline • Swiss Alps: Reuss above Lake Lucerne • French Alps: Fier river at Val du Fier • Himalaya: Arun river • Apennine: Fold-thrust belt of the Umbria–Marche Apennines

  13. Study area Location

  14. Study area Location

  15. Study area Location

  16. Study area Location

  17. Study area Stratigraphy

  18. Study area Stratigraphy

  19. Study area

  20. Study area Stratigraphy

  21. Study area

  22. Study area Stratigraphy

  23. Study area

  24. Study area Stratigraphy

  25. Study area

  26. Study area Stratigraphy

  27. Study area

  28. Study area Stratigraphy

  29. Study area

  30. Study area Stratigraphy

  31. Study area

  32. Study area Simplified Geological Map (after Uhlig, 1999 and Garcia, 2003 unpublished)

  33. Study area Simplified Geological Map (after Uhlig, 1999 and Garcia, 2003 unpublished)

  34. Study area Schematic Profiles

  35. Anticline structure Oxaya Anticline Geometry

  36. Anticline structure Oxaya Anticline Geometry

  37. Anticline structure Oxaya Formation Mesozoic Basement Basement – Tertiary units unconformity E W

  38. Anticline structure Azapa Formation Mesozoic Basement Basement – Tertiary units unconformity W E Image by Michi Strasser

  39. Anticline structure Tertiary Units Mesozoic Basement Tertiary Units Mesozoic Basement Tertiary units fold geometry E W Azapa Valley Lluta Valley W E

  40. Anticline structure Spatial distribution of structures

  41. Anticline structure E W Spatial distribution of structures

  42. Anticline structure Spatial distribution of structures

  43. Anticline structure W E Spatial distribution of structures

  44. Anticline structure Spatial distribution of structures

  45. Anticline structure E W Spatial distribution of structures

  46. Anticline structure Spatial distribution of structures

  47. Anticline structure W E Spatial distribution of structures

  48. Anticline structure Spatial distribution of structures

  49. Anticline structure Spatial distribution of structures

  50. Interpretation Timing of anticline growth

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