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Arc-continent collisions in the tropics set Earth’s climate state

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Science  12 Apr 2019:
Vol. 364, Issue 6436, pp. 181-184
DOI: 10.1126/science.aav5300
  • Fig. 1 Reconstructions of ophiolite-bearing sutures.

    All sutures within the compilation are shown in present-day coordinates in the 0 Ma map and are color-coded by age. The tropical rain belt is shaded green. Continental outlines shown are tectonic units of Torsvik and Cocks (30). Paleogeographic reconstructions of these tectonic units and actively exhuming sutures are shown at the times of peaks in total suture length (Fig. 2). The Triassic (250 Ma) peak in total suture length is at a nonglacial interval (red) with minimal suture length in the tropics. The Carboniferous (300 Ma) and Ordovician (445 Ma) peaks are both during glacial intervals (blue) and have extensive suture length in the tropics.

  • Fig. 2 Phanerozoic suture length in the tropics compared to the latitudinal extent of continental glaciation.

    (A) Total length of active suture length. (B) Total length of active sutures that are reconstructed to be within 10°, 15°, and 20° of the equator over the past 520 million years. (C) Blue marks the latitudinal extent of continental ice sheets, excluding Alpine glaciers (table S3).

Supplementary Materials

  • Arc-continent collisions in the tropics set Earth's climate statem

    Francis A. Macdonald, Nicholas L. Swanson-Hysell, Yuem Park, Lorraine Lisiecki, Oliver Jagoutz

    Materials/Methods, Supplementary Text, Tables, Figures, and/or References

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    • Materials and Methods
    • Figs. S1 to S9
    • Tables S1 to S4
    • Caption for Movie S1
    • References

    Images, Video, and Other Media

    Movie S1
    Five-million year snapshots of paleogeographic reconstruction of active sutures from 520 Ma to present. Continental outlines shown are the tectonic units of Torsvik and Cocks (30). Green band is 15° above and below the equator. Blue shade is ice-extent from database (Table S3). For simplicity and visualization ice-extent is shown as uniform along a given longitude, where in reality there were regional differences. Methods described in Materials and Methods section.
     
    Correction (3 May 2019):The units of the area columns in table S2 have been corrected to Mm2.
    The original version is accessible here.

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