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Global Correlations of Ocean Ridge Basalt Chemistry with Axial Depth and Crustal Thickness

Global Correlations of Ocean Ridge Basalt Chemistry with Axial Depth and Crustal Thickness,10.1029/JB092iB08p08089,Journal of Geophysical Research,Emi

Global Correlations of Ocean Ridge Basalt Chemistry with Axial Depth and Crustal Thickness   (Citations: 562)
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Journal: Journal of Geophysical Research , vol. 92, no. B8, pp. 8089-8115, 1987
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    • ...0; Klein and Langmuir 1987), showed that the degree of melting of the mantle is higher beneath the ELSC and VFR than beneath the CLSC (e...

    Quanshu Yanet al. Geochemistry of basaltic lavas from the southern Lau Basin: input of c...

    • ...spreading ridges, then melting models that assume that the mantle is homogenous at the scale of the melting region [e.g., Klein and Langmuir, 1987; Salters and Hart, 1989; McKenzie and O’Nions, 1991; Spiegelman and Elliott, 1993] are unlikely to be realistic...
    • ...of primitive MORB magmas are both sensitive to the degree of mantle melting [Klein and Langmuir, 1987; Langmuir et al., 1992; Niu and O’Hara, 2008]; melts produced by smaller degrees of mantle melting have higher Na2O, lower SiO2 for a given MgO...
    • ...integrated source ratios inferred from 176 Hf/ 177 Hf and 143 Nd/ 144 Nd. This observation apparently conflicts with the major element systematics of MORB, which have been interpreted to indicate that beneath shallow ridge segments the mantle is hotter and begins melting deeper, so that a greater proportion of the melt is generated within the stability field of garnet [Klein and Langmuir, 1987; Langmuir et al., 1992]...

    Karsten M. Haaseet al. Insights into mantle composition and mantle melting beneath mid-ocean ...

    • ...This simplification is appropriate for a situation in which melts migrate through the mantle in channels with inconsequential interaction with the wall rock (i.e., fractional or disequilibrium melting, e.g., Klein and Langmuir [1987], Johnson et al. [1990],...

    Todd Anthony Biancoet al. Geochemical variations at intraplate hot spots caused by variable melt...

    • ...In addition to the elevated Na contents, they are richer in Si and poorer in Fe. This type of melts was distinguished in some oceanic provinces, including the Cayman Trough [13], Australia–Antarctica Discordance [14], and equatorial Atlantic [15]...
    • ...Figure 4 shows variations in Na and Fe contents recalculated to 8 wt % MgO [13] in the glasses of the Mohns and Knipovich ridges...
    • ...This is why these parameters were proposed by Klein and Lang� muir [13] as indicators of the relative depths of tholei� ite magma generation beneath mid�ocean ridges...
    • ...Fig. 4. Variations in Na 8 and Fe 8 parameters [13] in the glasses from various ridges of the North Atlantic according to the data of [7–12]...
    • ...The arrow shows changes in Na and Fe related to a decrease in the depth and oceanic mantle degree of melting [13]...

    N. M. Sushchevskayaet al. Magmatism of the junction region of the Knipovich and Mohns Ridges (Po...

    • ...It can be seen in the Na 8 –Fe 8 diagram (content of elements in glass recalculated to 8 wt % MgO [11]) (Fig. 3) that the compositions of cruise 24 glasses fall within the field of previously analyzed glasses from 77° N and are different from the compositions of glasses from more southerly areas of the Knipovich, Mohns, and Kolbeinsey ridges in lower Fe8 (5.5–7.0) and higher Na8 values (2.7–3.0)...
    • ...Fig. 3. Variations of Na 8 and Fe 8 values [11] in glasses from various ridges of the North and Polar Atlantic according to [7, 8, 10, 12, 13]...

    N. M. Sushchevskayaet al. Conditions of formations of slightly enriched tholeiites in the northe...

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