Colorado river: origin and evolution

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Автор: Young R.A., Spamer E.E.

Название: Colorado river: origin and evolution

Издательство: Monograph Grand Canyon Association, No.

Год: 2003

Формат: PDF

Размер: 36.85mb

язык: английский

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Introduction.

Section A: Early Tertiary Events and Regional Geologic Setting.

The Laramide-Paleogene History of the Western Grand Canyon Region: Setting the Stage.

Paleogeomorphic Evolution of the Salt River Region: Implications for Cretaceous-Laramide Inheritance for Ancestral Colorado River Drainage.

Paleocene to Early Oligocene Basin Evolution. Southwestern Utah.

Fission-track Analysis of Apatite and Zircon from Grand Canyon, Arizona.

Laramide Cooling Histories of Grand Canyon, Arizona, and the Front Range. Colorado. Determined from Apatite Fission-track Thermochronology.

Section B: Areal Geologic Studies.

Age and Depositional Basin Morphology of the Bidahochi Formation and Imphcations for the Ancestral Upper Colorado River.

K-Ar Geochronologic Survey of the Hopi Buttes Volcanic Field.

Pliocene-Pleistocene Incision on the MogoUon Slope. Northern Arizona: Response to the Developing Grand Canyon.

Geomorphic Features and Processes of the Shivwits Plateau. Arizona, and Their Constraints on the Age of Western Grand Canyon.

Post-6 Ma Limestone Along the Southeastern Part of the Las Vegas Valley Shear Zone, Southern Nevada.

Depositional Environment and Paleogeographic Implications of the Late Miocene Hualapai Limestone, Northwestern Arizona and Southern Nevada.

40Ar/39Ar Geochronology of the Hualapai Limestone and Bouse Formation and Implications for the Age of the Lower Colorado River.

Pre-Colorado River Paleogeography and Extension Along the Colorado Plateau-Basin and Range Boundary, Northwestern Arizona.

Lower Colorado River: Upper Cenozoic Deposits, Incision, and Evolution.

Proposed Lower Colorado River Courses Prior to 4.3 Ma, Sonora, Mexico.

Section C: Estimating Rates of Incision.

Constraints on Timing and Rates of Late Cenozoic Incision by the Colorado River in Glenwood Canyon, Colorado: A Preliminary Synopsis.

Quaternary Incision Rates of the Colorado River and Major Tributaries in the Colorado Plateau, Utah.

Bedrock Incision Rates for the Fremont River. Tributary of the Colorado River.

The Colorado River and the Age of Glen Canyon.

Erosional History of the Colorado River through Glen and Grand Canyons.

Preliminary Evidence from Grand Canyon Caves and Mines for the Evolution of Grand Canyon and the Colorado River System.

Cosmogenic 3He Dating of Western Grand Canyon Basalts: Implications for Quaternary Incision of the Colorado River.

Rates of Downcutting of the Colorado River in the Grand Canyon Region.

Relating Differential Incision of Grand Canyon to Slip along the Hurricane/Toroweap Fault System.

Section D: Geochemistry and Uplift.

Application of Sr Isotopes to the Hydrology of the Colorado River System Waters and Potentially Related Neogene Sedimentary Formations.

The Bouse Formation and Post-Miocene Uplift of the Colorado Plateau.

Section E: Geologic Processes.

Debris Flows and Rapids in Grand Canyon: Implications for Erosion Rates and Evacuation of Sediment from Tributary Canyons.

Climate Change and the Evolution of Grand Canyon and the Colorado River Delta.

Section F: Selected Theories and Speculation.

Lake Overflow: An Alternative Hypothesis for Grand Canyon Incision and Development of the Colorado River.

Neogene Development of Little Colorado River Valley and Eastern Grand Canyon: Field Evidence for an Overtopping Hypothesis.

Headward Erosion Versus Closed-basin Spillover as Alternative Causes of Neogene Capture of the Ancestral Colorado River by the Gulf of California.

Section G: Important Extrusive and Intrusive Igneous Rock Units.

Volcanic Rocks of the Grand Canyon Area.

Appendices.

A: Geochron Database.

B: Authors and Contact Information.

C: Roster of Symposium Attendees.

Index.

References Cited.

Index.