Rubin, K. H. and J. Sinton (2007). "Inferences on mid-ocean ridge thermal and magmatic structure from MORB compositions." EARTH AND PLANET SCI LETT 260(1-2): 257-276

Interplays among magma accumulation, differentiation, heat loss, and eruption as functions of space and time at mid ocean ridges are key for understanding the creation and structure of oceanic crust. Using new observations of systematic, regional compositional variations in a global MORB dataset (>11000 samples compiled from PetDB), we propose a new ocean ridge magma chamber model in which the number, size and depth of shallowest melt segregations vary smoothly with spreading rate and magma supply. Magma reservoir depth in this model is dynamically controlled by the long-term melt flux to the crust. Highest melt supplies promote shallower and thermally more variable magmatic differentiation conditions, accompanied by a dramatic reduction in chemical variance for parameters related to parental melt compositions (i.e., those obtained in Earth's mantle). In contrast, low melt supply promotes the eruption of less differentiated magma from deeper magma chambers of more uniform differentiation degree but more variable mantle parentage. This new perspective on crustal magma bodies provides a framework for understanding structural, geophysical, hydrothermal and volcanological attributes of ridges. The major element, trace element, and radiogenic isotope data within PetDB made this research possible. - K. Rubin

 

 Rubin, K. H. and J. Sinton (2007). "Inferences on mid-ocean ridge thermal and magmatic structure from MORB compositions." EARTH AND PLANET SCI LETT 260(1-2): 257-276.doi:10.1016/j.epsl.2007.05.035

 

 

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