Figure from Cambrian magmatic rocks of the Ellsworth Mountains, West Antarctica

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Figure 3. Cartoon, which is not to scale, represents three proposed phases of tectonic and magmatic events recorded in the Cambrian Heritage Group. EM represents the approximate relative location of the Ellsworth Mountains. A. Rifting initiating formation of a narrow ocean basin. B. Continued spread of narrow ocean basin and lithosphere delamination. C. Initiation of narrow ocean basin closure with associated subduction related magmatism and deformation.