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Alkalic lavas have been discovered at two young (∼15–20 ka) submarine radial vents on the western flank of Mauna Loa, a volcano that was thought to have produced only tholeiitic lavas for at least the last ∼240,000 years. Major and trace element data show that the lavas from only one of these eruptions have undergone lower degrees of partial melting, the assumed dominant process for creating alkalic...
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