A method of discriminating between different types of mid-ocean ridge basalts and continental tholeiites with the Nb1bZr1bY diagram

Major- and trace-element geochemistry; lead, strontium, and neodymium isotopic compositions; and petrography of late Cenozoic basaltic rocks from west central Colorado

“…The Hf/Ta ratio was chosen because the ratio of one high-field-strength element (HFSE) to another is relatively insensitive to small amounts of contamination or fractional crystallization of olivine or plagioclase, and therefore should represent variations in magma sources (e.g. Wood, 1980;Meschede, 1986). The La/Yb ratio was chosen to reflect the degree of LREE enrichment which in turn should represent both the degree of partial melting of the source as well as the nature of the source region (e.g.…”

“…The Hf/Ta ratios are thought to represent primary features of the respective magmas that are relatively insensitive to differentiation or small amounts of crustal contamination (Wood, 1980;Meschede, 1986). The good correlation between Hf/Ta and both εNd and 87 Sr/ 86 Sr suggests that the isotopic values in these samples are also primary features of the magmas.…”

Mineralogy, geochemistry and sulfur isotope characterization of Cerro de Maimón (Dominican Republic), San Fernando and Antonio (Cuba) lower Cretaceous VMS deposits: Formation during subduction initiation of the proto-Caribbean lithosphere within a fore-arc

“…4C-F). Niobium depletion of studied basalts becomes evident in the Nb-Zr-Y discrimination diagram of Meschede (1986) as well, with the whole of the analyses plotting in the volcanic-arc and NMOR basalt field (Fig. 4A).…”

International Lateinamerika-Kolloquium 2009

“…Classification of the amphibolites using the Zr/Ti2O*0.0001 -Nb/Y diagram (Winchester and Floyd, 1977) leads to an alkaline to subalkaline nature for these rocks. On the other hand, the ternary discrimination diagram 2Nb -Zr/4 -Y (Meschede, 1986) points to E-MORB type and within-plate tholeiite affinities. The data of all samples plot along a tholeiitic trend in the AFM diagram.…”