Eruptive history and chemical evolution of the precaldera and postcaldera basalt-dacite sequences, Long Valley, California; implications for magma sources, current seismic unrest, and future volcanism.

Abstract

The Long Valley Volcanic Field in east-central California straddles the East Sierran frontal fault zone, overlapping the Sierra Nevada and western Basin and Range Provinces. Long Valley volcanism began about 4 Ma during Pliocene time and has continued intermittently through the Holocene. The current (post-1980) seismic unrest at Long Valley, accompanied by uplift of the resurgent dome, may signal the onset of a new episode of regional extension and basalt injection into the residual magma chamber.

66 samples from this reference