Details Title: Exam 3 Description: Brittle (fracture) Deformation Features (3/25) Total Flash Cards: 25 Created: 03/31/2009 20:26:29		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Geology Flashcards
Cards in this set: Term Joint Definition -crack along whcih there has been no appreciable movement -most common (smalll amount of stress) -forms from addition and subtraction of weight (overlying rocks) or shrinkage due (to cooling) Term Fault Definition -fracture w. relative movnment of rocks -both sides are parallel to the fracture -dip at angle Term Relative Displacement Definition -one side of fault has moved in a given direction relative to the other side Term Hanging Wall Definition -block of rock above an inclined fault Term Footwall Definition -block of rock below inclined fault Term Displacement Definition -measure of movenment of fault based on marker beds Term Normal (fault) Definition -hanging wall moves down -footwall moves up (tensional stress) Term Graben or Rift (fault) Definition -trench like structure -bounded by two normal faults Term Half-Graben (fault) Definition -trench like structure -formed when hanging wall moves downward on curve fault surface -subsidence occurs on single fault Term Horst (fault)   Definition -elevated block of crust -bounded by parallel normal faults -upthrust block Term Rift Valley (fault) Definition -tensional forces leave normal faults -down-dropped blocks (graben) valley Term Reverse (fault) Definition -hanging wall moves up -footwall down  -shortens and thickens crust (compressional stress) Term Thrust (fault) Definition -low angle (<15) reverse fault -older rocks are moved above younger rocks -sometimes hangingwall is above footwall Term Strike slip (fault) Definition -motion of fault blocks -movement horizontal, parallel to strike direction (sheer stress) (left lateral & right lateral)   Term Convergent Margin Definition -compression Term Divergent Margin Definition -tension Term Normal (fault) PICTURE Definition {image:http://www.uwsp.edu/geo/faculty/ritter/images/lithosphere/tectonics/normal_fault_labelled_diagram.jpg|center} Term Graben (fault) PICTURE Definition {image:http://www.bartleby.com/images/A4images/A4graben.jpg|center} Term Half- Graben (fault) PICTURE Definition {image:http://www.tulane.edu/~sanelson/images/halfgrab.gif|center} Term Horst (fault) PICTURE Definition {image:http://content.answers.com/main/content/img/McGrawHill/Encyclopedia/images/CE323800FG0010.gif|center} Term Rift Valley (fault) PICTURE Definition {image:http://www.amnh.org/learn/courses/images/W2E2_3.jpg|center} Term Reverse (fault) PICTURE Definition {image:http://facweb.bhc.edu/academics/science/harwoodr/GEOL101/study/Images/ReverseFault.gif|center} Term Thrust (fault) PICTURE Definition {image:http://www.infoeq.it/faglia_inversa.gif|center} Term Strike Slip right lateral (fault) PICTURE Definition {image:http://facweb.bhc.edu/academics/science/harwoodr/GEOL101/study/Images/StrikeSlipRLFault.gif|center} Term Strike Slip left lateral (fault) PICTURE Definition {image:http://facweb.bhc.edu/academics/science/harwoodr/GEOL101/Study/Images/StrikeSlipLLFault.gif|center}