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• W2019940244 abstract "Silicate liquid immiscibility in basalt petrogenesis is a contentious issue. Immiscible iron- and silica-rich liquids were reported in melt inclusions of lunar basalt and in groundmass glasses of terrestrial volcanics. In fully crystallized plutonic rocks, however, silicate liquid immiscibility has yet to be proven. Here we report the first finding of natural, immiscible iron- and silica-rich melts in a plutonic environment documented in the Skaergaard intrusion, East Greenland. Primary melt inclusions (now finely crystallized) in apatite are either dark or light colored. The predominant dark colored type contains 30.9 ± 4.2 wt% FeO t and 40.7 ± 3.6 wt% SiO 2 , whereas the light colored type contains 8.6 ± 5.9 wt% FeO t and 65.6 ± 7.3 wt% SiO 2 . Similar light colored melt inclusions in olivine and fine-grained dark and light colored interstitial pockets also give evidence of crystallization from emulsion of silica and iron-rich liquids. On the outcrop scale, silica-rich (melanogranophyre) pods and layers in iron-rich ferrodiorite of the Upper Zone of the Skaergaard intrusion witness segregation of the two liquids. These findings demand that silicate immiscibility is considered in basalt petrogenesis. Some granitic rocks may represent unmixed silica-rich melt, whereas the dense, iron-rich melt is likely to sink in the crust and could mix with hot mantle-derived magma to form unusual rocks, like ferropicrites, otherwise interpreted as products of heterogeneous mantle sources." @default.
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• W2019940244 date "2005-01-01" @default.
• W2019940244 modified "2023-10-16" @default.
• W2019940244 title "Immiscible iron- and silica-rich melts in basalt petrogenesis documented in the Skaergaard intrusion" @default.
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• W2019940244 doi "https://doi.org/10.1130/g21724.1" @default.
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