Trace element partitioning during incipient melting of phlogopite-peridotite in the spinel and garnet stability fields

Breaking Up Is Hard to Do: Magmatism During Oceanic Arc Breakup, Subduction Reversal, and Cessation

“…The slab melt in Fijian shoshonites seems to have been low‐temperature and zircon‐saturated because their Sm/Hf ratios are >2 which is even higher than in the Northern Marianas shoshonites for which zircon saturation was first invoked (Tollstrup & Gill, 2005). The large enrichments of K, Rb, Ba, and Sr relative to LREE (Figure 6) preclude residual phlogopite (e.g., Condamine et al., 2022). Other than that, the slab component in the shoshonites is not distinctive.…”

Lithology of EM1 Reservoir Revealed by Fe Isotopes of Continental Potassic Basalts

“…For this reason, high Zn/Fe ratio with low MgO content of the high‐δ 57 Fe endmember (Figure 4d), which is similar to those eclogite‐derived, primary low‐MgO basalts from Hannuoba, eastern China (Zou et al., 2022), again suggests the eclogite as the lithology of the EM1 component. The possibility that the high‐δ 57 Fe endmember are generated by melting of a phlogopite‐bearing peridotite is not favored, because this endmember shows significantly lower MgO (<5 wt.%) and higher SiO 2 (>53 wt.%) contents than the melts derived from such lithology (MgO = 8.3–16.7 wt.%, SiO 2 = 44.5–49.0 wt.%) (Condamine et al., 2016, 2022).…”

“…The possibility that the high-δ 57 Fe endmember are generated by melting of a phlogopite-bearing peridotite is not favored, because this endmember shows significantly lower MgO (<5 wt.%) and higher SiO 2 (>53 wt.%) contents than the melts derived from such lithology (MgO = 8.3-16.7 wt.%, SiO 2 = 44.5-49.0 wt.%) (Condamine et al, 2016(Condamine et al, , 2022.…”

“…Comparison between the major oxide compositions for the Cenozoic potassic basalts from northeast China and experimental melts of various lithologies.Major elemental compositions of the potassic basalts from northeast China have been corrected for olivine fractionation (details are shown in Section 4.1.1). Source for the experimental melts at 3-5 GPa are listed as followed: MORB-like eclogite(Pertermann & Hirschmann, 2003;Spandler et al, 2008), Sediment(Johnson & Plank, 2000;Mann & Schmidt, 2015;Spandler et al, 2010), Phlogopite-bearing peridotite(Condamine et al, 2016(Condamine et al, , 2022, and Garnet peridotite(Davis et al, 2011;Walter, 1998).…”

Highly evolved miaskitic syenites deciphering the origin and nature of enriched mantle source of ultrapotassic magmatism in the Variscan orogenic root (Bohemian Massif, Moldanubian Zone)

“…Trace element modelling confirms that low degree (1 %) melting of a phlogopite-bearing mantle source (see Section 5.4. for details) would generate appropriate parental melt compositions. We use the batch melting model of Shaw (1970) for the starting composition glimmerite (Förster et al 2017) and for mineral/melt partition coefficients, we use the values reported in Condamine et al (2022). The most obvious difference between the modeled melt composition and the studied miaskitic syenites is that the proposed parental melt have higher LREE, Sr and Nb (Fig.…”