The launch of a new GVP website is scheduled for Monday, May 20, 2013.
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Country: | México | |
| Subregion Name: | México | ||
| Volcano Number: | 1401008B | ||
| Volcano Type: | Caldera | ||
| Volcano Status: | Pleistocene-Hot Springs | ||
| Last Known Eruption: | Pleistocene | ||
| Summit Elevation: | 1300+ m | 4,265 feet | |
| Latitude: | 27.60°N | 27°36'0"N | |
| Longitude: | 112.53°W | 112°32'0"W | |
| El Aguajito caldera (also known as Santa Ana caldera) is located along the Gulf of California immediately NE of Tres Vírgenes volcano and NW of La Reforma caldera. The rim of the approximately 10-km-wide resurgent caldera is not exposed, but an arcuate line of andesitic-to-rhyolitic lava domes covers its northern margin. Formation of the rhyolitic caldera was associated with the eruption of ignimbrites, K-Ar dated at 0.76 +/- 0.06 million years ago (Ma), most of which were deposited in the Gulf of California. Rhyolitic lava domes on the northern margin have been dated at 0.5 +/- 0.04 Ma; dacitic lava domes on the southern side of the caldera appear to be older. The regional NNE-SSW-trending Cimarron fault cuts across the center of the caldera. Hot springs are located along the southern caldera margin, and active seismicity was noted during geothermal exploration. | |||
