Natural history of the salton trough
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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 SaltonTrough


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

Ocean Crust


Paleozoic rocks


Grand Canyon


Paleozoic Limestone

Colorado River Delta


Algae removes CO2 - acidity decreases

- lime precipitates

Ancient Lake Cahuilla


Travertine Point (sort of)

Paleozoic Lime (Marble)

Holocene Lime (Travertine)


Marble (metamorphosed limestone)


Pangaea Breakup

Pangaea’s Breakup ends Paleozoic Stability


Lithospheric Plates


Plate B

Plate A

Plate C

Fig. 3-16b, p. 75


Plate B

Plate A

Gap: divergent plate boundary

Plate C

Fig. 3-16b, p. 75


Plate B

Plate A

Overlap: convergent plate boundary

Plate C

Fig. 3-16b, p. 75


Sliding: transform plate boundary

Plate B

Plate A

Plate C

Fig. 3-16b, p. 75


T

U

M

S


Volcanic Arc

Craton

Farallon Plate

North American Plate


Backbone of Cuyamaca Mountains = Complex of 100’s of Plutons


Batholiths


Accretionary Wedge

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 Breakup

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


T

U

M

S


U

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


UPLIFTED PENEPLAIN


East Pacific Rise


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