Magma commonly forms during continental breakup in response to stretching and thinning of the lithosphere and decompression melting of the asthenospheric mantle (White and McKenzie, 1989). This magma may stall during its ascent and intrude the crust in the form of sills, dikes, or inclined sheets, and/or be expelled at the earth’s surface to form volcanoes or volcanogenic vents. Because continental stretching precedes the formation of continental margins, the emplacement of intrusive and extrusive igneous rocks is common during continental breakup, with these igneous products being particularly common in some of the world’s most prolific hydrocarbon provinces (e.g.,...

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