Question

What happened to the 2 to 12 km-thick pile of volcanic rocks that originally covered the PRB plutons (now a batholith)?

a.The volcanic pile has been transform faulted northward into the Los Angeles basin.
b.The volcanic pile was completely engulfed by magmas of the PRB and foundered into enormous magma chambers to be reborn as granites.
c.The volcanic pile was subjected to massive uplift and erosion and ended up depositing in the Pacific Ocean and on the San Diego Coastal plair
d,The volcanic pile was subjected to massive metamorphism and ended up turning into all the schists and gneisses now found in the batholith.
e.The entire volcanic pile slid off the PRB into the Salton Trough in a massive landslide.

Answer 1

The volcanic rocks that covered the PRB plutons were eroded and materials were deposited in the Pacific Ocean and the San Diego Coastal Plain.

Step-by-step explanation:

The 2 to 12 km-thick pile of volcanic rocks that originally covered the Peninsular Ranges Batholith (PRB) plutons was subjected to massive uplift and erosion processes. Over geological time, the erosional forces gradually stripped away this volcanic pile, with the materials being carried off and deposited elsewhere, including the Pacific Ocean, and onto the San Diego Coastal Plain. This type of geological change involves tectonic activity and extensive weathering and erosion, which is often seen in regions with a history of volcanic activity and mountain building, such as near convergent plate boundaries or hotspots.

The volcanic pile was not transformed faulted northward into the Los Angeles basin, engulfed by magmas of the PRB and foundered into enormous magma chambers to be reborn as granites, subjected to massive metamorphism turning into schists and gneisses in the batholith, or slid off the PRB into the Salton Trough in a massive landslide.