The Sierra Blanca igneous complex experienced its most recent volcanic eruptions approximately 26 million years ago. This activity was part of a broader period of volcanic and plutonic rock formation that occurred between about 26 to 38 million years ago.
Geological Context of Sierra Blanca Volcanism
The volcanic and plutonic rocks forming the Sierra Blanca igneous complex and the Lincoln County porphyry belt were created through processes of eruption onto and intrusion into the Sierra Blanca basin. This significant geological period spanned several million years, establishing the foundations of the complex we observe today.
| Geological Event | Approximate Timeframe (Millions of Years Ago) |
|---|---|
| Sierra Blanca Volcanic Activity | 26 to 38 |
| Most Recent Eruptions | Around 26 |
Following these ancient volcanic episodes, the Sierra Blanca basin and its associated volcanic centers have been subsequently disrupted by Rio Grande rift extensional faulting. This later geological activity has continued to shape the landscape, long after the primary volcanic phases of the Sierra Blanca complex concluded.
