Variation in styles of rifting in the Gulf of California

摘要: Constraints on the structure of rifted continental margins and magmatism resulting from such rifting can help refine our understanding strength lithosphere, state underlying mantle transition to seafloor spreading. An important structural classification rifts is by width, with narrow thought form as necking instabilities (where extension rates outpace thermal diffusion) wide require a mechanism inhibit localization, lower-crustal flow in high heat-flow settings. Observations that results range volcanic two three times predicted melting models non-volcanic almost no rift or post-rift magmatism. Such variations magmatic activity are commonly attributed temperature. Here we describe PESCADOR seismic experiment southern Gulf California present crustal-scale images across segments. Over short lateral distances, observe large differences style magmatism--from minor synchronous magmatically robust But many factors believed control evolution during (extension rate, potential temperature heat flow) tend vary over larger length scales. We conclude instead depletion, rather than low temperature, accounts for observed wide, magma-poor margins, fertility possibly sedimentary insulation, account