07_416M_Other_Structures_handout

07_416M_Other_Struct - Other Sedimentary Structures Lecture Outline I.Macro-scale features II.Bed-scale features III.Deformation structures

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Other Sedimentary Structures Lecture Outline I.Macro-scale features II.Bed-scale features III.Deformation structures IV.Surface structures V.Sole structures VI.Biogenic structures Reading Assignment: Boggs, Chapter 4: 74-81, 91-116. 1
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Macro-Scale Features Overall bedding Lateral accretion Large-scale deformation 2
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Bed Scale 3
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Bed Shape 4
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5
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Lateral Accretion 6
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Syndeformation Structures 7
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Deformation Features – Bed Scale Causes: earthquakes, salt dissolution, downslope movement. Bed resistance by lithology – mudstone vs. sandstone 8
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Bed-Scale Features Special structures related to bedforms Lenticular to flaser bedding Herringbone structures Hummocky cross bedding Grading Normal Inverse Varves 9
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10 Bedforms migrating at an angle α relative to the horizontal surface connecting their troughs. This angle is conveniently described by the relative magnitudes of two orthogonal components of the bedform velocity vector (V); V x parallel to the generalized depositional surface and in the direction of down-current flow, and V z normal the surface. The angle α is described by: τανα = ζ ς ξ Production of Cross beds by migrating bedforms: α β
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11 http://walrus.wr.usgs.gov/seds/bedforms/index.html Movement of bedforms with no sediment deposition: V z = 0 Movement of bedforms with sediment deposition: V z > 0
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Each set is made of up sediment added to the portion of the lee face of a bedform that was not re- eroded during passage of following bedform troughs. A train of bedforms migrating
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This note was uploaded on 02/08/2011 for the course GEO 416M taught by Professor Staff during the Fall '08 term at University of Texas at Austin.

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07_416M_Other_Struct - Other Sedimentary Structures Lecture Outline I.Macro-scale features II.Bed-scale features III.Deformation structures

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