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Petrochemically, the volcanic rocks are dominantly medium-K calc-alkaline in composition and show enrichment of large ion lithophile elements, as well as depletion of high field strength elements, thus revealing that volcanic rocks evolved from a parental magmas derived from an enriched mantle source.

Chondrite-normalized rare-earth element patterns of the volcanic rocks are concave upwards with low- to-medium enrichment (La) of 0.68 to 1.02 Ga, suggesting an enriched lithospheric mantle source of Proterozoic age.

Such mixtures also produce elevated Sr as the y-axis of the ‘isochron’.

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In contrast, Earth’s most abundant lava rocks, which represent the mantle and make up the major oceanic ridges, have values between 0.703 and 0.705.

This difference may appear small, but, considering that modern instruments can make the determination to a few parts in 70,000, it is quite significant.

Although the Rb-Sr isotope system composition was totally reset at 325 Ma, coincidental with the peak of the Variscan metamorphism, the Nd isotope composition has not been perturbed, and yielded εNd ≈ 0.9–1.25 Ga, thus indicating mantle-derived magmas with a perceptible crustal component.

The chemical features of these rocks: A1-type chemistry, elevated fluorine, exceptionally high HFSE and REE with a large Eu negative anomaly, constant Nb/Ta ≈ 9.4, and (Th/Ta) 3 as Th and Ta increase, cannot be explained by magmatic differentiation of mantle magmas plus bulk-assimilation of continental crust.