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Natural History of the Salton Trough. Salton Trough. Gulf of California. Colorado River Delta. Peninsular Ranges. Cuyamaca Mountains. San Diego. T. U. M. S. T. U. M. S. Limestone. Great Barrier Reef, Australia. ARIZONA. SAN DIEGO. Stable Continental Crust (craton). Limestone.

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Natural History of the Salton Trough

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Natural history of the salton trough
Natural History of the SaltonTrough


Natural history of the salton trough

Salton Trough

Gulf of California





Natural history of the salton trough

T

U

M

S


Natural history of the salton trough

T

U

M

S


Natural history of the salton trough

Limestone

Great Barrier Reef, Australia


Natural history of the salton trough

ARIZONA

SAN DIEGO

Stable Continental

Crust (craton)

Limestone

Ocean Crust




Natural history of the salton trough

Paleozoic Limestone

Colorado River Delta


Natural history of the salton trough

Algae removes CO2 - acidity decreases

- lime precipitates

Ancient Lake Cahuilla


Natural history of the salton trough

Travertine Point (sort of)

Paleozoic Lime (Marble)

Holocene Lime (Travertine)



Pangaea breakup
Pangaea Breakup

Pangaea’s Breakup ends Paleozoic Stability



Natural history of the salton trough

Plate B

Plate A

Plate C

Fig. 3-16b, p. 75


Natural history of the salton trough

Plate B

Plate A

Gap: divergent plate boundary

Plate C

Fig. 3-16b, p. 75


Natural history of the salton trough

Plate B

Plate A

Overlap: convergent plate boundary

Plate C

Fig. 3-16b, p. 75


Natural history of the salton trough

Sliding: transform plate boundary

Plate B

Plate A

Plate C

Fig. 3-16b, p. 75


Natural history of the salton trough

T

U

M

S


Natural history of the salton trough

Volcanic Arc

Craton

Farallon Plate

North American Plate



Natural history of the salton trough

Batholiths Plutons


Natural history of the salton trough

Accretionary Wedge Plutons

Forearc Basin (Point Loma / Cabrillo Fm.)

Regional Metamorphism

(Santiago Peak Volcanics, Julian Schist, Marble)

Forearc thrusting and subduction erosion

Peninsular Ranges Batholith

Metamorphosed wedge sediments (Catalina - Orocopia schists)


Pangaea breakup1
Pangaea Breakup Plutons

Paleocene (58–66 Ma)

Pleistocene to Recent (0–1.6 Ma)

Pliocene (1.6–5 Ma)

Late Cretaceous (66–88 Ma)

Middle Cretaceous (88–118 Ma)

Miocene (5–24 Ma)

Oligocene (24–37 Ma)

Early Cretaceous (118–144 Ma)

Late Jurassic (144–161 Ma)

Eocene (37–58 Ma)

Subduction Flattens


Natural history of the salton trough

T Plutons

U

M

S


Natural history of the salton trough

U Plutons

Un-roofed batholith

Forearc Basin

(La Jolla / Poway groups)

Undulating peneplain

Catalina Schist

Uplift

Orocopia Schist

subduction erosion

Underplating

Unusually thick Farallon Plate

Magma production shifts east




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