Pioneer Seamount
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Pioneer Seamount is 11.0±0.1 million years old (Davis et al., in press) and is nearly equidimensional with width and length of about 12.8 kilometers. It rises about 1930 meters above the surrounding seafloor to a minimum water depth of 820 meters. It has a volume of about 135 km3. Samples recovered from Pioneer are alkalic basalt, hawaiite, and mugearite. Like samples from Davidson Seamount, all samples are highly vesicular.
| Index Map | Axial Volcano | Gorda Ridge | Cleft Segment | Taney Seamounts |
| Guide, Gumdrop, Pioneer Seamounts | Mendocino Fracture Zone | President Jackson Seamount | Davidson Seamount | Vance Seamounts |