Most Efficient Method for Modeling Folds Given Only Trend & Plunge Lines?

BenHenderson

I've got an historic map with oriented lines indicating fold hinges and a dip for each line. What's the best method to convert these lines into accurate structural data?

Thank you!

GrahamAndrews

Hi Ben.
When you say you have a dip for each line, do you mean the plunge of the fold hinge, or the dip of one of the fold limbs?
Can you post a copy or sketch of the map?
Graham
Seequent - Training Content Developer (Geology & Geostats)

BenHenderson

screen shot fold hinge lines 4050.png

Thanks @GrahamAndrews! I've attached a typical section of the map I'm working with. The hinge lines are drawn on the map, but no other orientation data. Some of the hinge lines do have a plunge measurement, but not all. Any help or suggestions would be appreciated-thank you!

Ben

GrahamAndrews

Hi Ben,

This looks like an opportunity to use the fold interpolant tool in Leapfrog [Form Interpolants]. The amount of dip & strike data you have for the bedding/foliation is enough to adjust the structural trends of the interpolants, the same with the plunge direction arrows you have. Because your fold axes are fairly close to parallel, so they can share the same general structural trend.

I recommend having a look through the online training for Leapfrog's Structural Modelling Tools, specifically the section on structural surfaces [Catalogue | Seequent Learning Centre], the section on form interpolants [Catalogue | Seequent Learning Centre], and the section on structural trends [Catalogue | Seequent Learning Centre].

Have a go at that and get back to me if you need more help.

Thanks

Graham

BenHenderson

Thanks Graham! I'll give that a try and let you know how it goes. Really appreciate the help!