1 / 14

Geologic Cross-Sections

Geologic Cross-Sections. Cross Sections are Based on Surface and Sub-Surface Data. Sub-Surface Interpretation (3-D). Constructing a Cross-Section. choose a line of section (perpendicular to structures). Cross-Section Construction Cont …. 2. transfer topographic data

elbertk
Download Presentation

Geologic Cross-Sections

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Geologic Cross-Sections

  2. Cross Sections are Based on Surface and Sub-Surface Data

  3. Sub-Surface Interpretation (3-D)

  4. Constructing a Cross-Section • choose a line of section (perpendicular to structures)

  5. Cross-Section Construction Cont… 2. transfer topographic data (topographic profile with no vertical exaggeration)

  6. Structural Data – (Apparent) Dips 3. add structural data to the topographic profile

  7. Add the Geology! 4. add geologic data (contacts) to the profile; dash in eroded structures above present-day topography

  8. Apparent Dip

  9. True Dip & Apparent Dip

  10. = apparent dip = angle between strike and apparent dip direction = true dip Apparent to True Dip Trigonometry

  11. ( ) Calculating Apparent Dip from True Dip

  12. Apparent Dip “Nomogram”

  13. True Dip to Apparent Dip – the Easy Way!

  14. Cross Section “Rules” • calculate apparent dips of beds that are not perfectly perpendicular to your section line • DO NOT use vertical exaggeration • don’t extrapolate structural data too far from your section line • dash in eroded structures above the present-day topography • don’t extend dip data more than a few hundred meters in depth

More Related