Small masses of intraplate mafic plutonic and volcanic rocks are exposed in the Navajo volcanic field (26–24 Ma), Dulce dike swarm (25–20 Ma), and western San Juan Mountains (7–0.6 Ma) along the eastern boundary of the Colorado Plateau. Geochemical and Sr-Nd isotopic data for these rocks were employed to assess the time-space variations in melt compositions and to investigate the contributions from different mantle and crustal sources during magma production.
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Gonzales et al. (2016) studied this question.
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