Figure 11. Sketch (not to scale) of a propagating rift model from Whitmarsh and Miles (1995) to illustrate Hypothesis 2 presented here. The model includes (A) unthinned continental crust; (B) continental crust thinned by tectonic extension with upper crust normal faults; (C) a transitional crust consisting of blocks of faulted continental crust and a high density of intrusives (black), which are oriented parallel to the seafloor spreading anomalies; (D) oceanic crust produced by seafloor spreading. Crosses indicate outcrops of mantle ultramafic rocks (peridotite ridge).

Figure 11. Sketch (not to scale) of a propagating rift model from Whitmarsh and Miles (1995) to illustrate Hypothesis 2 presented here. The model includes (A) unthinned continental crust; (B) continental crust thinned by tectonic extension with upper crust normal faults; (C) a transitional crust consisting of blocks of faulted continental crust and a high density of intrusives (black), which are oriented parallel to the seafloor spreading anomalies; (D) oceanic crust produced by seafloor spreading. Crosses indicate outcrops of mantle ultramafic rocks (peridotite ridge).