Figure 10: Hypothetical eruption model for El Cajete Series. Stage I. Vertical gradients in a deep magma chamber. Stage II. Magma intruded into a shallow sub-chamber and causing thinning of the compositional zones in the upper part of the subchamber. Stage III. Eruption of ECP and BAT; the plinian eruption of ECP tapped into the lower less silicic zones. Stage IV. Static period. Erosion of ECP and BAT; the sub-chamber re-established the zonation. Stage V. Eruption of BB lava.