Kroll this guy is rich younger what phase of magma

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Unformatted text preview: This guy is rich Younger What phase of magma fractionation would result in the placement of this ore body? Which formed first, the ore body or the fault? What common mineral is mostly likely in the ore body? Reverse Normal This poor guy is out of luck Miners pay geologists to find their lost orebody One friend earned enough to buy a house Fracture Zones and Slickensides Fracture a) b) c) Visible displacement of rocks Pulverized rock and “Slickensides” Key beds cut out by faulting reappear elsewhere. Types of Faults - 2 Types • Strike-slip faults 1) Example: San Andreas Example: Transform fault Transform Distinctive landforms (linear Distinctive valleys, chains of lakes, sag ponds, topographic saddles) ponds, Fresh pulverized rock. Fresh Transform fault through granite: Arkose sandstone Arkose Evidence of Shear stress 2) 3) 4) Horizontal Movement Along Strike-Slip Fault Strike-Slip Faults & Plate Tectonics Faults Divergence Convergence Transform Plate tectonics and faulting Plate • Normal faults: mid-ocean ridges and continental rifts are the same thing. • Divergent Margins – Surface rock is pulled apart – Hanging wall drops down Horst and Graben Formation Graben Graben in Iceland Iceland Source: Simon Fraser/Science Photo Library/Photo Researchers, Inc. Plate tectonics and faulting Plate • Shallow dipping Reverse Fault called a “Thrust Fault”. • Reverse and thrust faults: convergent plate boundaries • Hanging Wall is pushed up. Lewis Thrust Fault Lewis Lewis Thrust Fault (cont'd) Lewis Same layer Lewis Thrust Fault (cont'd) Lewis Source: Bre...
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This document was uploaded on 01/26/2014.

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