Figure 1: Cross-section through a mid-ocean ridge. | Nature

Figure 1: Cross-section through a mid-ocean ridge.

From: Molten rocks in motion

Figure 1

Chemical differences between volcanic rocks found at the ridge axis and at off-axis locations support a passive model of mantle flow, as discussed by Spiegelman and Reynolds1. In passive flow, upwelling of 'liquid' magma (solid lines) and solid mantle (dotted lines) is in response to (rather than the cause of) plate motion. The magma is concentrated at the ridge crest but converges from a wide area beneath the ridge.

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