G145

BASIN AND RANGE

 

1.   Describe the features common to Basin and Range Topography.

 

2.   Understand what the plate configuration was at the beginning of the Cenozoic and how it changed over    time

 

3.   Understand how the stresses changed in the basin and range region over time and what effect those changes in stress had on the area.

       

4.   Know the general region that the Basin and Range covers in N. America

 

5.   Definitions/feature to know what they are and how they form:

            Tensional stress                         pluvial lake

             normal fault                             playa

             fault block                                lake bench

             Rain Shadow desert                   Internal drainage

 

6.   Understand why the extension of the crust causes basaltic volcanism?

 

7.   Know the approximate time frame for the formation of the Basin and Range structure in OR

              2 time blocks:  20-10 mybp:  silicic volcanism

                                       Last 10 my: fault block mountains dominate

 

8.  Know the basic stratigraphy for the Steens area

      Pueblo Mtn :  granite emplaced during Jurassic (~150mybp)

      Pike Creek Formation:  Miocene Rhyolites  (~21mybp)

      Steens Basalts:  Miocene Andesites and Basalts (~12mybp)

      Ash Flow Tuffs:  Devine Canyon (9mpbp); Prater Creek (8.4 mybp); Rattlesnake (6.4mybp)

      Harney formation:  Pleistocene lake deposits

 

9.  What glacial features were “stamped” on this area during the Pleistocene?

 

10.  Why are there abundant hot springs and mineralization in this area?