Structure - Orogenies

Age of the Assembly of North America

2.3 Ga to 1.0 Ga

Age of Rifting and Passive Margin

700-500 Ma

Geologic Ages of Antler Orogen

Devonian - Mississippian

Age of Antler Orogen

375-352 Ma

Rollback Induced Extension Between Which Orogenies?

Antler and Sonoma

Age of the Sonoma Orogen

280-200 Ma

Geologic Ages of the Sonoma Orogen

Permian - Triassic

Age of the Sevier Orogen

150-75 Ma

Geologic Ages of the Sevier Orogen

Jurassic - L Cretaceous

Age of the Laramide Orogen

80-50 Ma

Geologic Ages of the Laramide Orogen

L Cretaceous - Tertiary

Age of the MMCC and Ignimbrite Flair-up

45-18 Ma

Age of the Basin and Range

16-0 Ma

Geologic Ages of the Rifting and Passive Margin

L Precambrian - E Paleozoic

Geologic Ages of the Island Arc (related to the Antler Orogen)

Silurian - Ordovician

When is subduction greater than convergence?

Extensional Backarc

When is subduction less than convergence?

Compressional Backarc

When is subduction equal to convergence?

Neutral Backarc

How was the Havallah Basin created?

Slab Rollback

What type of rollback happened in the Triassic?

Neutral Backarc

What type of rollback happened during the Sevier Orogen?

Compressional Backarc

What orogeny had the Sierra Nevada Batholith?

Sevier Orogeny

What orogeny turned off the Sierra Nevada Batholith?

Laramide Orogeny

MMCC are mm and plutonic rocks surrounded by what?

1. Low Angle Normal Fault (window)

2. Faulted volcanic and sedimentary rocks

What event created the San Andreas Fault?

Basin and Range

How was the Basin and Range formed?

High Angle Normal Faults (separating footwall ranges from hanging wall basins)