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Experimental modeling of structure-forming deformations in rift zones of mid-ocean ridges

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Abstract

The modern methods of physical modeling of structure-forming deformations in extension zones of oceanic lithosphere are discussed; the methods differ in their experimental equipment, model material, and experimental techniques. The simulation performed with an elastic-ductile model has demonstrated that extension of a brittle lithospheric layer results in disruption of its continuity and in formation of a rift valley according to the mechanism of running fracture propagation. The modeling results provide insights into qualitative pattern of faulting and fracturing within a rift zone, specific features of rift segmentation, and development of various structural elements (axis bends, echelons of fractures, nontransform offsets, small and large overlaps, etc.) under various geodynamic conditions of spreading. The modeling has shown that origination and evolution of structures of various types depend on the lithosphere’s thickness beneath the rift axis; the width of the lithosphere’s heating zone; the spreading orientation; and, to a lesser degree, on the spreading rate. A relatively rectilinear rift broken into particular segments bounded by small-amplitude offsets with or without minor overlaps arises in the case of both a small width of the heating zone, closely related to the axial magma chamber, and a small thickness of the lithosphere (fast-spreading conditions). In the case of a wide heating zone caused by ascent of an asthenospheric wedge or a mantle plume, offsets of rift are more pronounced and deformations embrace a wider region. If, as a result, the thickness of the lithosphere increases, the rift will be less linear and the structural heterogeneity will become more contrasting. In addition to the thickness of the lithosphere, the angle between the rift zone and the extension axis also controls the rift configuration: the greater the angle, the more conspicuous the en echelon arrangement of fractures. For any spreading type, the propagating front of linear microfractures that disrupt the upper brittle layer of the lithosphere predates the origin of mesoscopic fractures and predetermines a general trend of the rift zone. This indicates that the fractures of various sizes propagate simultaneously.

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References

  1. A. L. Grokholskii and T. V. Gazina, “Experimental Study of the Origin and Propagation of Rift in the Oceanic Lithosphere and Formation of Its Morphostructural Features,” in Proceedings of the All-Russia Tectonic Conference on Neogaean Tectonics: Global and Regional Aspects (GEOS, Moscow, 2001), Vol. 1, pp. 184–188 [in Russian].

    Google Scholar 

  2. A. L. Grokholskii and E. P. Dubinin, “Kinematic and Morphometric Features of Spreading Axes Overlap Zones in Mid-Oceanic Ridges,” Tikhookean. Geol. 18(4), 3–15 (1999).

    Google Scholar 

  3. A. L. Grokholskii and A. S. Ushakov, “Experimental Modeling of Geodynamic Processes at the Boundaries of Lithospheric Plates,” in The Earth’s Life. Geodynamics and Ecology (Moscow State Univ., Moscow, 2001), pp. 162–194 [in Russian].

    Google Scholar 

  4. A. L. Grokholskii, E. P. Dubinin, and T. V. Gazina, “Specific Features of the Development of Structural Heterogeneities in the Rift Zones of the Oceanic Lithosphere with Different Spreading Parameters: Physical Modeling Results,” Vest. Mosk. Univ., Ser. 4, Geol., No. 5, 7–14 (2002).

  5. E. P. Dubinin and A. L. Grokholskii, “Geodynamic Nature of the Self-Organization of Structural Segmentation of Rift Zones in Mid-Oceanic Ridges,” in Synergetics (Moscow State Univ., Moscow, 1999), Vol. 2, pp. 137–152 [in Russian].

    Google Scholar 

  6. E. P. Dubinin, A. L. Grokholskii, A. V. Rozova, and A. A. Sveshnikov, “Tectonic Aspects of the Morphostructural Segmentation of Rift Zones of Slow-and Fast-Spreading Mid-Oceanic Ridges,” in Proceedings of the All-Russia Tectonic Conference on Neogaean Tectonics: Global and Regional Aspects (GEOS, Moscow, 2001), Vol. 1, pp. 215–219 [in Russian].

    Google Scholar 

  7. E. P. Dubinin, Yu. I. Prozorov, and N. I. Belaya, “Geodynamic Nature of the Segmentation of Mid-Oceanic Ridges,” in The Earth’s Life. Geodynamics and Geoecology (Moscow State Univ., Moscow, 1992), pp. 46–55 [in Russian].

    Google Scholar 

  8. E. P. Dubinin and S. A. Ushakov, Oceanic Rifting (GEOS, Moscow, 2001) [in Russian].

    Google Scholar 

  9. N. A. Logachev, S. A. Bornyakov, and S. I. Sherman, “Mechanism of the Baikal Rift Zone Formation Based on Results of Physical Modeling,” Dokl. Akad. Nauk 373(3), 388–390 (2000) [Dokl. Earth Sci. 373A (6), 980–982 (2000)].

    Google Scholar 

  10. B. V. Malkin and A. I. Shemenda, “Mechanism of Continental Rifting,” Geotektonika 24(5), 24–37 (1989).

    Google Scholar 

  11. V. G. Talitskii and V. A. Galkin, “Experimental Study of Deformations in Structured Media and Implications for Tectonic Mechanisms,” Geotektonika 31(1), 82–89 (1997) [Geotectonics 31 (1), 76–82 (1997)].

    Google Scholar 

  12. A. I. Shemenda, “Similarity Criteria for Mechanic Modeling of Tectonic Processes,” Geol. Geofiz. 24(10), 10–19 (1983).

    Google Scholar 

  13. A. I. Shemenda and A. L. Grokholskii, “Formation and Evolution of Spreading Axis Overlap Zones,” Tikhookean. Geol. 7(5), 97–107 (1988).

    Google Scholar 

  14. B. Appelgate and A. N. Shor, “The Northern Mid-Atlantic and Reykjanes Ridges: Spreading Center Morphology Between 55°50′ N and 63°00′ N,” J. Geophys. Res. 99(B9), 17935–17956 (1994).

    Article  Google Scholar 

  15. C. Basile and J. P. Brun, “Transtensional Faulting Patterns Ranging from Pull-Apart Basins to Transform Continental Margins: An Experimental Investigation,” J. Struct. Geology 21, 23–37 (1999).

    Google Scholar 

  16. V. Benes and P. Davy, “Modes of Continental Lithospheric Extension: Experimental Verification of Strain Localisation Processes,” Tectonophysics 254, 69–87 (1995).

    Google Scholar 

  17. M. Bonini, T. Souriot, M. Boccaletti, and P. Brun, “Successive Orthogonal and Oblique Extension Episodes in a Rift Zone: Laboratory Experiments with Application to the Ethiopian Rift,” Tectonics 16, 347–362 (1997).

    Article  Google Scholar 

  18. S. Constable, M. Sinha, and L. MacGregor, et al., “RAMESSES Finds a Magma Chamber Beneath a Slow-Spreading Ridge,” InterRidge News 6(1), 18–22 (1997).

    Google Scholar 

  19. O. Dauteuil and J.-P. Brun, “Oblique Rifting in a Slow-Spreading Ridge,” Nature 361, 145–148 (1993).

    Article  Google Scholar 

  20. O. Dauteuil, O. Bourgeois, and T. Mauduit, “Lithosphere Strength Controls Oceanic Transform Zone Structure: Insights from Analogue Models,” Geophys. J. Int. 150, 706–714 (2002).

    Article  Google Scholar 

  21. O. Dauteuil and Y. Mart, “Analogue Modeling of Faulting Pattern, Ductile Deformation, and Vertical Motion in Strike-Slip Fault Zones,” Tectonics 17, 303–310 (1998).

    Article  Google Scholar 

  22. R. S. Detrick, H. D. Needham, and V. Renard, “Gravity Anomalies and Crustal Thickness Variations along the Mid-Atlantic Ridge between 33° N and 40° N,” J. Geophys. Res. 100(B3), 3767–3787 (1995).

    Article  Google Scholar 

  23. C. Durand, V. Ballu, P. Gente, and J. Dubois, “Horst and Graben Structures on the Flanks of Mid-Atlantic Ridge,” Tectonophysics 265, 275–297 (1996).

    Google Scholar 

  24. D. Gapais, G. Fiquet, and P. Cobbold, “Slip System Domains. 3. New Insights in Fault Kinematics from Plane Strain Sandbox Experiments,” Tectonophysics 188, 143–157 (1991).

    Article  Google Scholar 

  25. P. Gente, R. Pockalny, C. Durand, et al., “Characteristics and Evolution of the Segmentation of the Mid-Atlantic Ridge between 20° N and 24° N during Last 10 Million Years,” Earth Planet. Sci. Lett. 129, 55–71 (1995).

    Article  Google Scholar 

  26. J.A. Goff, A. Malinverno, D. J. Fornari, and J. R. Cochran, “Abyssal Hills Segmentation: Quantitative Analysis of the East Pacific Rise Flanks 7° S-9° S,” J. Geophys. Res. 98(B8), 13851–13862 (1993).

    Google Scholar 

  27. J. Goslin and Triatnord Scientific Party, “Extent of Azores Plume Influence on the Mid-Atlantic Ridge North of the Hotspot,” Geology 27(11), 991–994 (1999).

    Article  Google Scholar 

  28. N. R. Grindlay, J. A. Madsen, C. Rommevaux, et al., “Southwest Indian Ridge 15°–35° E: A Geophysical Investigation of an Ultra-Slow Spreading Mid-Ocean Ridge System,” InterRidge Phase 2 Project 5(2) 7–12 (1996).

    Google Scholar 

  29. M. Hempton and R. Neher, “Experimental Fracture, Strain and Subsidence Patterns over en Echelon Strike-Slip Faults: Implications for the Structural Evolution of Pull-Apart Basins,” J. Struct. Geol 8, 597–605 (1986).

    Google Scholar 

  30. M. Keep and K. R. McClay, “Analogue Modeling of Multiphase Rift System,” Tectonophysics 273, 239–270 (1997).

    Article  Google Scholar 

  31. L. S. Kong, S. C. Solomon, and G. M. Purdy, “Microearth-quake Character of a Mid-Ocean Ridge along Axis High,” J. Geophys. Res. 97, 1659–1685 (1992).

    Google Scholar 

  32. J. Lin, G. M. Purdy, H. Schouten, et al., “Evidence from Gravity Data for Focused Magmatic Accretion along the Mid-Atlantic Ridge,” Nature 344, 627–632 (1990).

    Article  Google Scholar 

  33. P. Lonsdale, “Non Transform Offsets of the Pacific-Cocos Plate Boundary and Their Trace on the Rise Flank,” Bull. Geol. Soc. Am. 96, 313–327 (1985).

    Google Scholar 

  34. Y. Ma and J. R. Cochran, “Bathymetric Roughness of the Southeast Indian Ridge: Implications for Crustal Accretion at Intermediate Spreading Rate Mid-Ocean Ridges,” J. Geophys. Res. 102, 17697–17711 (1997).

    Article  Google Scholar 

  35. K. C. Macdonald, P. J. Fox, S. Miller, et al., “The East Pacific Rise and Its Flanks 8°–18° N: History of Segmentation, Propagation and Spreading Direction Based on Sea MARC II and Sea Beam Studies,” Marine Geophys. Res 14, 299–344 (1992).

    Google Scholar 

  36. M. Maia and P. Gente, “Three-Dimensional Gravity and Bathymetry Analysis of the Mid-Atlantic Ridge between 20° N and 24° N: Flow Geometry and Temporal Evolution of the Segmentation,” J. Geophys. Res. 103(B1), 951–974 (1998).

    Article  Google Scholar 

  37. B. V. Malkin and A. I. Shemenda, “Mechanism of Rifting: Considerations Based on Results of Physical Modeling and on Geological and Geophysical Data,” Tectonophysics 199, 193–210 (1991).

    Article  Google Scholar 

  38. G. Mandl, Mechanics of Tectonic Faulting, Models and Basic Concepts (Elsevier, Amsterdam, 1988).

    Google Scholar 

  39. Y. Mart and O. Dauteuil, “Analogue Experiment of Propagation of Oblique Rifts,” Tectonophysics 316, 121–132 (2000).

    Article  Google Scholar 

  40. T. Mauduit and O. Dauteuil, “Small-Scale Models of Oceanic Transform Zones,” J. Geophys. Res. 101, 195–209 (1996).

    Article  Google Scholar 

  41. K. McClay and T. Dooley, “Analogue Models of Pull-Apart Basins,” Geology 23, 711–714 (1995).

    Article  Google Scholar 

  42. K. McClay and P. Ellis, “Geometry of Extensional Fault System Developed in Model Experiments,” Geology 15, 341–344 (1987).

    Article  Google Scholar 

  43. M. J. Phipps and D. Forsyth, “Three-Dimensional Flow and Temperature Perturbations Due to a Transform Offset: Effects on Oceanic Crustal and Upper Mantle Structure,” J. Geophys. Res. 93, 2955–2966 (1998).

    Google Scholar 

  44. G. M. Purdy, L. S. L. Kong, G. L. Chiteson, and S. C. Solomon, “Relationship between Spreading Rate and the Seismic Structure of Mid-Ocean Ridges,” Nature 355, 815–817 (1992).

    Article  Google Scholar 

  45. B. Rahe, D. A. Ferrill, and A. P. Morris, “Physical Analogue Modeling of Pull-Apart Basin Evolution,” Tectonophysics 285, 21–40 (1998).

    Article  Google Scholar 

  46. P. Richard, B. Mocquet, and P. Cobbold, “Experiments on Simultaneous Faulting and Folding above a Basement Wrench Fault,” Tectonophysics 188, 133–141 (1991).

    Google Scholar 

  47. P. Richard, M. Naylor, and A. Koopman, “Experimental Models of Strike-Slip Tectonics,” Pet. Geosci. 1, 71–80 (1995).

    Google Scholar 

  48. G. Schreurs, “Experiments on Strike-Slip Faulting and Block Rotation,” Geology 22, 567–570 (1994).

    Article  Google Scholar 

  49. R. C. Searle, “Location and Segmentation of the Cocos-Nazca Spreading Centre West of 95° W,” Marine Geophys. Res. 11, 15–26 (1989).

    Google Scholar 

  50. R. C. Searle, P. Field, and R. Owens, “Segmentation and a Nontransform Ridge Offset on the Reykjanes Ridge near 58° N,” J. Geophys. Res. 99(B12), 24159–24172 (1994).

    Article  Google Scholar 

  51. J.-C. Sempere, J. Lin, H. S. Brown, et al., “Segmentation and Morphotectonic Variations along a Slow-Spreading Center: The Mid-Atlantic Ridge (24°00′ N-0°40′ N),” Marine Geophys. Res. 15, 153–200 (1993).

    Google Scholar 

  52. P. R. Shaw and J. Lin, “Model of Ocean Ridge Lithospheric Deformation: Dependence on Crustal Thickness, Spreading Rate, and Segmentation,” J. Geophys. Res. 101, 17977–17993 (1996).

    Google Scholar 

  53. A. I. Shemenda and A. L. Grokholsky, “A Formation and Evolution of Overlapping Spreading Centers (Constrained on the Basis of Physical Modeling),” Tectonophysics 199, 389–404 (1991).

    Article  Google Scholar 

  54. A. I. Shemenda and A. L. Grokholsky, “Physical Modeling of Slow Seafloor Spreading,” J. Geophys. Res. 99, 9137–9153 (1994).

    Article  Google Scholar 

  55. J. Smallwood and R. White, “Crustal Accretion at the Reykjanes Ridge, 61°–62° N,” J. Geophys. Res. 103(B3), 5185–5201 (1998).

    Article  Google Scholar 

  56. D. W. Sparks, E. M. Parmentier, and M. J. Phipps, “Three-Dimensional Mantle Convection beneath a Segmented Spreading Center: Implications for a Long Axis Variations in Crustal Thickness and Gravity,” J. Geophys. Res. 98, 21977–21995 (1993).

    Google Scholar 

  57. T. Tentler, “Analogue Modeling of Overlapping Spreading Centers: Insight into Their Propagation and Coalescence,” Tectonophysics 376, 99–115 (2003).

    Article  Google Scholar 

  58. R. Thibaud, O. Dauteuil, and P. Gente, “Faulting Pattern along Slow-Spreading Segments: A Consequence of along-Axis Variation in Lithospheric Rheology,” Tectonophysics 312, 157–174 (1999).

    Article  Google Scholar 

  59. R. Thibaud, P. Gente, and M. Maia, “A Systematic Analysis of the Mid-Atlantic Ridge Morphology and Gravity between 15° N and 40° N: Constraints of the Thermal Structure,” J. Geophys. Res. 103, 24223–24243 (1998).

    Google Scholar 

  60. C. Tisseau and T. Tonnerre, “Non Steady-State Thermal Model of Spreading Ridges: Implication for Melt Generation and Mantle Outcrops”, in Mantle and Lower Crust Exposed in Ridges and Ophiolites, Ed. by R. L. M. Vissers and A. Nicolas (Kluwer, Rotterdam, 1995), pp. 181–214.

    Google Scholar 

  61. V. Tron and J. Brun, “Experiments on Oblique Rifting in Brittle-Ductile Systems,” Tectonophysics 188, 71–84 (1991).

    Article  Google Scholar 

  62. G. W. Tuckwell, J. M. Bull, and D. J. Sanderson, “Numerical Models of Faulting at Oblique Spreading Centers,” J. Geophys. Res. 103(B7), 15473–15482 (1998).

    Article  Google Scholar 

  63. G. Williams and I. Vann, “The Geometry of Listric Normal Faults and Deformation in Their Hangingwalls,” J. Struct. Geol. 9, 789–795 (1987).

    Google Scholar 

  64. M. Withjack, Q. Islam, and P. LaPoint, “Normal Faults and Their Hangingwall Deformation: An Experimental Study,” Am. Assoc. Pet. Geol. 79, 1–18 (1995).

    Google Scholar 

  65. M. Withjack and W. Jamison, “Deformation Produced by Oblique Rifting,” Tectonophysics 126, 99–124 (1986).

    Article  Google Scholar 

  66. C.J. Wolfe, G.M. Purdy, D.R. Toomey, and S.C. Solomon, “Microearthquake Characteristics and Crustal Velocity Structure at 29° N on the Mid-Atlantic Ridge: the Architecture of a Slow-Spreading Ridge,” J. Geophys. Res. 100, 24449–24472 (1995).

    Article  Google Scholar 

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  1. Physical Geography Museum, Moscow State University, Vorob’evy gory, Moscow, 119992, Russia

    A. L. Grokholskii & E. P. Dubinin

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Grokholskii, A.L., Dubinin, E.P. Experimental modeling of structure-forming deformations in rift zones of mid-ocean ridges. Geotecton. 40, 64–80 (2006). https://doi.org/10.1134/S0016852106010067

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