Petrology and geochemistry of calc-alkaline volcanic and …

These characteristics are generated by the fractionation of amphibole and the suppression of plagioclase crystallization from hydrous calc-alkaline magmas.

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On the development of the calc-alkaline and tholeiitic …

Mantle melting at mid-ocean ridges produces dry magmas that differentiate at low-pressure conditions, resulting in early plagioclase saturation, late oxide precipitation, and Fe …

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Distinct magma evolution processes control the

In thin arcs, porphyry Cu–Au deposits are associated with both low-K and high-K calc-alkaline magmas as well as with alkaline magmas (Chiaradia, 2020).

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Alkaline magmas in shallow arc plutonic roots: a field and …

We propose that such nepheline-normative dykes are a hallmark of hydrous cumulate melting in subvolcanic plumbing systems. Therefore, ne-normative dykes in arc batholiths may indicate periods with high magma fluxes. The online version contains supplementary material available at 10.1007/s00410-023-02047-3.

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Amphibole–melt trace element partitioning of fractionating calc

The most compatible rare earth elements in the amphibole structure are dysprosium (Dy) and holmium (Ho). The fractionation between LREE/MREE ( Amph/L D La / Amph/L D Sm = 0.12–0.08) and ( Amph/L D La / Amph/L D Yb = 0.09–0.06) decreases slightly with temperature for calcic amphiboles (Table 5 ).

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Alkaline magmas in shallow arc plutonic roots: a field and

We propose that such nepheline-normative dykes are a hallmark of hydrous cumulate melting in subvolcanic plumbing systems. Therefore, ne-normative dykes in arc batholiths may indicate periods with high magma fluxes.

WhatsApp: +86 18221755073

On the development of the calc-alkaline and tholeiitic magma series…

Mantle melting at mid-ocean ridges produces dry magmas that differentiate at low-pressure conditions, resulting in early plagioclase saturation, late oxide precipitation, and Fe-enrichment in mid-ocean ridge basalts (MORBs).

WhatsApp: +86 18221755073

Alkaline magmas in shallow arc plutonic roots: a field and

We propose that such nepheline-normative dykes are a hallmark of hydrous cumulate melting in subvolcanic plumbing systems. Therefore, ne-normative dykes in arc …

WhatsApp: +86 18221755073

Amphibole–melt trace element partitioning of fractionating …

The most compatible rare earth elements in the amphibole structure are dysprosium (Dy) and holmium (Ho). The fractionation between LREE/MREE ( Amph/L D La / Amph/L D …

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Source and fractionation controls on subduction-related …

We show that trace element ratios such as Nb/Ta and Dy/Yb systematically decrease with increasing SiO 2, for both the 17–16 Ma calc-alkaline and the 12–13 Ma K-rich …

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Generation of tholeiitic and calc-alkaline arc magmas and its

We show that magnetite starts to fractionate only at MgO ≤ 4 wt% for nearly all arc magmas and thus has no bearing on the early Fe depletion in calc-alkaline arc magmas. The Fe enrichment at MgO > 4 wt% for tholeiitic arc magmas is …

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Generation of tholeiitic and calc-alkaline arc magmas and its

We show that magnetite starts to fractionate only at MgO ≤ 4 wt% for nearly all arc magmas and thus has no bearing on the early Fe depletion in calc-alkaline arc magmas. The Fe enrichment at MgO > 4 wt% for tholeiitic arc magmas is largely caused by clinopyroxene …

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Relationships between high-K magmas and Cu–Au …

Porphyry Cu–Au deposits are typically associated with oxidized intermediate or felsic calc-alkaline magmas (Pettke et al. 2010; Sillitoe 2010; Wilkinson 2013). Porphyry deposits host about two-thirds of the world's Cu resources, critical …

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Alkaline magmas in shallow arc plutonic roots: a field and …

We propose that such nepheline-normative dykes are a hallmark of hydrous cumulate melting in subvolcanic plumbing systems. Therefore, ne-normative dykes in arc …

WhatsApp: +86 18221755073

Source and fractionation controls on subduction-related …

We show that trace element ratios such as Nb/Ta and Dy/Yb systematically decrease with increasing SiO 2, for both the 17–16 Ma calc-alkaline and the 12–13 Ma K-rich transitional magmatism. In contrast, Th/Nb and La/Nb monitor the changes in the source composition of these magmas.

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Generation of alkaline magmas in subduction zones by …

Here we report results from experiments in which natural mélange materials were partially melted at upper mantle conditions to produce alkaline magmas.

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Relationships between high-K magmas and Cu–Au porphyry …

Porphyry Cu–Au deposits are typically associated with oxidized intermediate or felsic calc-alkaline magmas (Pettke et al. 2010; Sillitoe 2010; Wilkinson 2013). Porphyry deposits host about two-thirds of the world's Cu resources, critical for the green energy transition (Singer 2017).

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