The launch of a new GVP website is scheduled for Monday, May 20, 2013.
|
|
Country: | México | |
| Subregion Name: | México | ||
| Volcano Number: | 140106=A | ||
| Volcano Type: | Caldera | ||
| Volcano Status: | Pleistocene-Fumarolic | ||
| Last Known Eruption: | Pleistocene | ||
| Summit Elevation: | 3400+ m | 11,155 feet | |
| Latitude: | 19.85°N | 19°51'0"N | |
| Longitude: | 100.63°W | 100°38'0"W | |
| The Los Azufres volcanic center is one of several silicic volcanic complexes with active geothermal systems that lie north of the axis of the Mexican Volcanic Belt. Located about 200 km NW of Mexico City, the Los Azufres center consists of a 18 x 20 km wide early Pleistocene caldera that was later partially filled by resurgent dacitic-to-rhyolitic lava domes. Two magmatic cycles lasting about 200,000 years each took place between 1.4 and 0.8 Ma (million years), consisting of silicic, followed by basaltic volcanism. The latest magmatic cycle, beginning about 0.6 Ma, involved resurgent doming of the southern part of the caldera, the eruption of chemically diverse basaltic-to-rhyolitic products, and the emplacement of dacitic-rhyolitic lava domes. The latest paroxysmal eruptions produced ignimbrites between 38,000 and 26,000 years ago. Hot springs and fumaroles are located along E-W-trending faults, and Los Azufres is an active producing geothermal field. | |||
