Correlated patterns in hydrothermal plume distribution and apparent magmatic budget along 2500 km of the Southeast Indian Ridge

摘要: Multiple geological processes affect the distribution of hydrothermal venting along a mid-ocean ridge. Deciphering role specific process is often frustrated by simultaneous changes in other influences. Here we take advantage almost constant spreading rate (65–71 mm/yr) 2500 km Southeast Indian Ridge (SEIR) between 77°E and 99°E to examine spatial density relative regional segment-scale apparent magmatic budget. We use 227 vertical profiles light backscatter (on 41 profiles) oxidation-reduction potential 27 first second-order ridge segments on adjacent Amsterdam-St. Paul (ASP) Plateau map ph, fraction casts detecting plume. At scale, five crossing magma-thickened hot spot plateau entirely suppressed (ph = 0.02). Conversely, combined ph (0.34) from all follows global trend versus rate. Off ASP Plateau, multisegment trends track axial depth, high where depth increases low it decreases. individual segment robust correlation cross-axis inflation for first-order shows that different budgets among are expressed as levels density. This absent segments. Eighty-five percent plumes occur eight clusters totaling ∼350 km. hypothesize these minimum estimate length melt lenses underlying this section SEIR.