Geology 3120 Geology 3120 --Metamorphic Core ComplexesMetamorphic Core Complexes

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OutlineOutline

• Pure and Simple Shear

• Detachments

• Basin and Range

• Whipple Mountain

• Buckskin-Rawhide Detachment

• Metamorphic Core Complex Model

Pure ShearPure Shear

Simple ShearSimple Shear

Detachment FaultsDetachment Faults

Basin and RangeBasin and Range

• Late Cenozoic extension

• North-south trending normal faults

• Change in motion along western plate boundary may have induced extension

Basin and Range Normal Fault BlocksBasin and Range Normal Fault Blocks

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Whipple Mountain Geologic MapWhipple Mountain Geologic Map

Whipple Mountain Detachment FaultWhipple Mountain Detachment Fault

SWSW NENE

Whipple Mountain CrossWhipple Mountain Cross--SectionSection

BuckskinBuckskin--Rawhide DetachmentRawhide Detachment

NWNW SESE

BuckskinBuckskin--Rawhide DetachmentRawhide Detachment

NWNW SESE

BuckskinBuckskin--Rawhide DetachmentRawhide Detachment

WW E

Metamorphic Core Complex ModelMetamorphic Core Complex Model

Metamorphic Core Complex ModelMetamorphic Core Complex Model

Metamorphic Core Complex ModelMetamorphic Core Complex Model

Metamorphic Core Complex ModelMetamorphic Core Complex Model

ReferencesReferences

Slide 1Slide 1Coney, P. J., Cordilleran metamorphic core complexes; an overvieConey, P. J., Cordilleran metamorphic core complexes; an overview, w, in:in: Crittenden, M.,D., Jr., Crittenden, M.,D., Jr., Coney, P. J., and G. H. Davis (eds), Cordilleran metamorphic corConey, P. J., and G. H. Davis (eds), Cordilleran metamorphic core complexes, Geological e complexes, Geological Society of America Memoir 153, 7Society of America Memoir 153, 7--31. 1980.31. 1980.

Slides 3Slides 3--1010TwissTwiss, R. J. and E. M., R. J. and E. M. MooresMoores, Structural Geology, W. H. Freeman & Co., New York, 532 p., , Structural Geology, W. H. Freeman & Co., New York, 532 p., 1992.1992.

Slides 11Slides 11--1313http://www.Colorado.EDU/GeolSci/courses/GEOL4717/Web4717http://www.Colorado.EDU/GeolSci/courses/GEOL4717/Web4717--02Photos/Home.html02Photos/Home.html

Slides 14Slides 14--1717Davis. G. H. and S. J. Reynolds, Structural Geology of Rocks andDavis. G. H. and S. J. Reynolds, Structural Geology of Rocks and Regions, 2nd ed., John Regions, 2nd ed., John Wiley & Sons, New York, 776 p., 1996.Wiley & Sons, New York, 776 p., 1996.