Intra-Panthalassa Ocean subduction zones revealed by fossil arcs and mantle structure

Journal name:
Nature Geoscience
Volume:
5,
Pages:
215–219
Year published:
DOI:
doi:10.1038/ngeo1401
Received
Accepted
Published online

The vast Panthalassa Ocean once surrounded the supercontinent Pangaea. Subduction has since consumed most of the oceanic plates that formed the ocean floor, so classic plate reconstructions based on magnetic anomalies can be used only to constrain the ocean’s history since the Cretaceous period1, 2, and the Triassic–Jurassic plate tectonic evolution of the Panthalassa Ocean remains largely unresolved3, 4. Geological clues come from extinct intra-oceanic volcanic arcs that formed above ancient subduction zones, but have since been accreted to the North American and Asian continental margins4. Here we compile data on the composition, the timing of formation and accretion, and the present-day locations of these volcanic arcs and show that intra-oceanic subduction zones must have once been situated in a central Panthalassa location in our plate tectonic reconstructions5, 6, 7. To constrain the palaeoposition of the extinct arcs, we correlate them with remnants of subducted slabs that have been identified in the mantle using seismic-wave tomographic models8, 9. We suggest that a series of subduction zones, together called Telkhinia, may have defined two separate palaeo-oceanic plate systems—the Pontus and Thalassa oceans. Our reconstruction provides constraints on the palaeolongitude and tectonic evolution of the Telkhinia subduction zones and Panthalassa Ocean that are crucial for global plate tectonic reconstructions and models of mantle dynamics.

At a glance

Figures

  1. Present understanding of the Panthalassa Ocean.
    Figure 1: Present understanding of the Panthalassa Ocean.

    Modified plate tectonic reconstruction5, 6, 7 centred at the 180° meridian at a, the present time and b, 200Myr ago (earliest Jurassic). Continental blocks in absolute plate reference frames: slab-fitted frame7, light grey; hybrid true-polar-wander-corrected frame5, 6, 22, dark grey. Light blue denotes preserved Jurassic (140–175Myr old) old crust of the Pacific plate. Yellow zigzag shows the presumed spreading ridge. White ellipses represent terranes: AK, Anadyr–Koryak; KO, Kolyma–Omolon; ON, Oku–Niikappu; S, Stikinia; WR, Wrangellia.

  2. Tomographic slices.
    Figure 2: Tomographic slices.

    Two cross-sections of the tomographic model8 centred at the 180° meridian of a, vertical slice at 4°N and b, horizontal slice at 1,900km depth. Fast (blue) P-wave speed anomalies at the centre of each tomography section show the suggested Triassic–Jurassic slab remnants. Yellow stars represent central Pacific seismic scatterers, caused by subducted and folded oceanic crust26. Zones of low- or absent image resolution occur above the inclined large-dashed line in the lower panel of a. Numbers along the horizontal axis in a denote arc-degrees along the section. The horizontal solid black line in b shows the location of section a.

  3. Comparison of tomographic models.
    Figure 3: Comparison of tomographic models.

    Tomographic slice a, at 2,300km depth8, showing positive P-wave speed anomalies below the central Pacific, depicted here by black dashed oval, and b, at 2,400km depth9, showing S-wave speed anomalies9 with zero to positive S-wave speed amplitudes, separating the LLSVP with strong negative amplitude into a western and eastern region. Black arrow shows the modelled extent of the western LLSVP high along a northwest–southeast profile28.

  4. Plate tectonic interpretation of tomography.
    Figure 4: Plate tectonic interpretation of tomography.

    a, Tomographic8 depth slice at 2,300km. Colour scale as in Fig. 3. Discussed slabs: EC, east China; F, Farallon; GI, Georgia Islands; Tk, Telkhinia slab group. b, Modified plate tectonic reconstruction5, 6, 7 200Myr ago (Jurassic–Triassic boundary). Red lines with triangles denote interpreted subduction zones, polarities are speculative. Yellow zigzag denotes presumed spreading ridge. Green line denotes presumed transform zone. White ellipses denote inferred position of the discussed exotic terranes (see also Fig. 1).

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Author information

Affiliations

  1. Institute of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands

    • D. G. van der Meer,
    • W. Spakman &
    • M. L. Amaru
  2. Nexen Petroleum UK Ltd, Charter Place, Vine Street, Uxbridge, Middlesex UB8 1JG, UK

    • D. G. van der Meer
  3. Physics of Geological Processes, University of Oslo, NO-0316 Oslo, Norway

    • T. H. Torsvik &
    • D. J. J. van Hinsbergen
  4. Center for Geodynamics, Geological Survey of Norway, NO-7494 Trondheim, Norway

    • T. H. Torsvik
  5. School of Geosciences, University of the Witwatersrand, WITS 2050 Johannesburg, South Africa

    • T. H. Torsvik
  6. Center for Advanced Study, Norwegian Academy of Science and Letters, Drammensveien 78, NO-0271 Oslo, Norway

    • T. H. Torsvik &
    • D. J. J. van Hinsbergen
  7. Chevron Energy Technology Company, 1500 Louisiana St, Houston, Texas 77002, USA

    • M. L. Amaru

Contributions

D.G.v.d.M. carried out the slab identification and plate tectonic reconstruction modifications. W.S. co-developed the tomographic model. T.H.T. provided the plate tectonic reconstructions. D.J.J.v.H. provided integration between surface geology, orogenesis and subduction. M.L.A. developed the tomographic model as part of her PhD work at Utrecht University. All authors shared in writing the article.

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The authors declare no competing financial interests.

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