REVIEW - The Cyclicity(layering record in sedimentary rocks...

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The Cyclicity (layering) record in sedimentary rocks suggests that different earth sun relationships can explain the varying rates (cycles) of sedimentation. Match the rates to the process: o 100000 year cycles – Eccentricity o 40000 year cycles – Changes in Tilt o 20000 year cycles – Wobble in axis of rotation Sediments deposited in ocean basin (from nearest to land to furthest away are: o Conglomerate, Sand, Shale Changes in sea level as recorded by sediments, and come under the general concept of: o Milankovic orbital freezing In the Rate of erosion = .03 mm/yr, how long does it take to erode a 3000m high mountain? o .03 mm * 100,000,000 = 3000m so 100 million years An example of a chemical sediment is: o Salt Deposit Progressive increase in pressure and temperature of shale is recorded by the appearance of critical minerals. Match the following minerals to Increasing P and T conditions: o Lowest Pressure and Temperature: Chlorite o Slightly Higher Pressure, Temperature: Biotite o
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  • Fall '08
  • AKSinha
  • Permian o Triassic o Cretaceous, pressure temperature condition, 3000m high mountain, Syncline plunging west, Milankovic orbital freezing

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