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[求助]
求助一道题
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题目如下： Rhyolites in the North Shore Volcanic Sequence (MN) yield εNd values of -2 to -15, and rhyolites from the Porcupine Mtns(MI) have even lower values at -9 to -21. Basalts of the Portage Lake lavas(Keweenaw Peninsula) have average 87Sr/86Sr intitial ratio of 0.7035. How can you reconcile these values with each other and with your result for the Pigeon River intruions? 有附图。 大神教我！  1.png |
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