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What are the differences between N-MORB, E-MORB and OIB with regards to: Tectonic setting Geochemical features There are several types of basalts, but I can't find a clearly explained article.
E-MORB, are more evolved than N-MORB from comparable regions of the ocean and there are a higher proportion of E-MORB in the Atlantic (31%) compared to the Pacific (12%) and Galapagos Spreading Center region (7%).
ALL MORB and N-MORB are substantially more enriched than early estimates of normal ridge basalts. The mean composition of back-arc spreading centers requires higher extents of melting and greater concentrations of fluid-mobile elements, reflecting the influence of water on back-arc petrogenesis.
Understanding the Differences: N-MORB, E-MORB, and OIB Hotspots and Earth science provide a fascinating window into the dynamic processes occurring beneath the surface of our planet. When it comes to studying volcanic activity and the composition of magmas, three different types of volcanic rocks play a critical role: N-MORB, E-MORB, and OIB.
These E-MORB subsequently spread away from the AST, and, finally, were preserved on the seafloor through asymmetric construction of the extrusive layer.
It is generally considered that both N-MORB and OIB are independent end-members from depleted and enriched mantle-derived rocks, while E-MORB is the result of mixing N-MORB with OIB.
We propose a new model accounting for E-MORB genesis We investigate the nature of the mantle heterogeneity at 14degN in the MAR The OIB/seamount recycling model is applicable to other ridges in the...
E-MORB magmas beneath the APR seen to have been produced by low-degree melting at deeper regime, where enriched materials have preferentially participated in the melting. The occurrence of E-MORB at the APR is a good example to better understand what kinds of magmatism would occur in association with extinction of the ridge spreading.
Complementary trace element modeling yielded compositionally similar E-MORB and OIB sources with moderately incompatible element enrichments in the OIB source due to the in uence of recycled oceanic crust (Prytulak & Elliott, 2007).
Collections of mid-ocean ridge basalts (MORB) do not represent a perfectly random sampling of the mid-ocean ridge system. Thus, a bias is introduced into characterizations of the global MORB reservoir, and by inference geochemical models of the Depleted MORB Mantle (DMM) and the bulk silicate Earth (BSE), based on measurements of these samples. Of particular importance and a subject of ongoing ...