Westward Migrating Ignimbrite Calderas and a Large Radiating Mafic Dike Swarm of Oligocene Age , Central Rio Grande Rift , New Mexico : Surface Expression of an Upper Mantle Diapir ?

@inproceedings{Chamberlin2003WestwardMI,
  title={Westward Migrating Ignimbrite Calderas and a Large Radiating Mafic Dike Swarm of Oligocene Age , Central Rio Grande Rift , New Mexico : Surface Expression of an Upper Mantle Diapir ?},
  author={Richard Chamberlin and F Jon Chapin and W C. Mcintosh and New Mexico},
  year={2003}
}
(Chamberlin et al., 2002) NNWstriking dikes near Riley should show the NNE dikes cutting the NNW set, where they intersect. Likewise, subparallel dikes at Acoma, Hickman and Pie Town should become younger to the west, which is a trend already suggested by the published low-precision K/Ar data (Fig.1). Detailed mapping of dike crossing relationships and Ar/Ar dating of the radial dike swarm are now underway; preliminary results seem favorable. Thick piles of mafic lavas interleaved with… CONTINUE READING

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