GeoLogic Mapping C

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TwelveSquared
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GeoLogic Mapping C

Postby TwelveSquared » August 23rd, 2014, 2:45 pm

Hello!
Welcome to the question marathon for GeoLogic Mapping! Enjoy your stay.

the seed question:

What geological structure is featured in this photo?
Image
Tonganoxie High School
Astronomy, Geologic Mapping, Robot Arm, Hydrogeology

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elephantower
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Re: GeoLogic Mapping C

Postby elephantower » August 23rd, 2014, 6:38 pm

chevron fold, or to be precise (bottom to top) chevron fold, unconformity, synform
[S/N]
N/A = didn't compete

2013:
Geologic Mapping: 1, 2
Designer Genes: 3, :(
Astronomy: N/A, :(
2014:
Geologic Mapping: 1, N/A
Protein Modelling: 1, N/A
It's About Time: 1, N/A
Forensics: 9, N/A
2015:
Geologic Mapping: 1, ?
Hydrogeology: 1, ?
It's About Time: 1, ?
Forensics: 10, ?

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TwelveSquared
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Re: GeoLogic Mapping C

Postby TwelveSquared » August 24th, 2014, 12:07 pm

'Tis right!
Tonganoxie High School
Astronomy, Geologic Mapping, Robot Arm, Hydrogeology

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elephantower
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Re: GeoLogic Mapping C

Postby elephantower » August 24th, 2014, 1:15 pm

I'm walking out in the desert when I notice a seam of gold ore outcropping right under my feet, at an elevation of 750 m. I then walk 80 m NW and come to another outcropping of the same seam (at an elevation of 1000 m). Eager to stake a claim to the bed, I run SSE to get back to my car, nearly missing a third outcrop 200 m away from the 2nd, at an elevation of 600 m. Assuming the ore forms a planar bed, what is the strike and dip of the bed? Explain your method for solving the problem.
[S/N]
N/A = didn't compete

2013:
Geologic Mapping: 1, 2
Designer Genes: 3, :(
Astronomy: N/A, :(
2014:
Geologic Mapping: 1, N/A
Protein Modelling: 1, N/A
It's About Time: 1, N/A
Forensics: 9, N/A
2015:
Geologic Mapping: 1, ?
Hydrogeology: 1, ?
It's About Time: 1, ?
Forensics: 10, ?

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elephantower
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Re: GeoLogic Mapping C

Postby elephantower » September 22nd, 2014, 6:16 pm

Welp did I kill the question marathon? Should I give a hint/easier question?
[S/N]
N/A = didn't compete

2013:
Geologic Mapping: 1, 2
Designer Genes: 3, :(
Astronomy: N/A, :(
2014:
Geologic Mapping: 1, N/A
Protein Modelling: 1, N/A
It's About Time: 1, N/A
Forensics: 9, N/A
2015:
Geologic Mapping: 1, ?
Hydrogeology: 1, ?
It's About Time: 1, ?
Forensics: 10, ?

HeavyHitter406
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Re: GeoLogic Mapping C

Postby HeavyHitter406 » September 24th, 2014, 2:22 pm

Elephant, remember a lot of us are just starting this event...I know I am just getting into this stuff. Maybe we should start off a bit easier, like something we could get with only a couple days of studying:D
2014 (Wright State/Lisle/Grayslake/Regionals/State/Nationals)

Water Quality: 8/1/2/1/2/3
Experimental Design: 12/1/5/5/8/37
Road Scholar: 12/2/2/3/3/11
Wheeled Vehicle: 32/6/6/2/11/5

zerasaw
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Re: GeoLogic Mapping C

Postby zerasaw » September 24th, 2014, 4:55 pm

elephantower I haven't started studying yet but wouldn't it just be the cross product of the 2 vectors?
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Trackest
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Re: GeoLogic Mapping C

Postby Trackest » September 26th, 2014, 7:21 pm

I'm walking out in the desert when I notice a seam of gold ore outcropping right under my feet, at an elevation of 750 m. I then walk 80 m NW and come to another outcropping of the same seam (at an elevation of 1000 m). Eager to stake a claim to the bed, I run SSE to get back to my car, nearly missing a third outcrop 200 m away from the 2nd, at an elevation of 600 m. Assuming the ore forms a planar bed, what is the strike and dip of the bed? Explain your method for solving the problem.
Strike is 0 degrees and dip is 76.5 degrees? I marked the contours then calculated the dip angle by measuring the distance between each contour line and using trig with the depth difference. The strike was just the azimuth of the contours I think.

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elephantower
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Re: GeoLogic Mapping C

Postby elephantower » September 26th, 2014, 11:42 pm

Heavyhitter, your not living up to your name :P
um idk what crossproducts are but it certainly does involve vectors (the way I did it).
75.6 degrees -- did you switch digits? :/
and
98.5 degrees
. I'm sure that the strike isn't 0 from inspection; how exactly did you get that?

I did this quickly, and rounded carelessly, so my numbers could be off.

EDIT: Read about crossproducts: if I understand them that would give the strike; how would you get the dip?
[S/N]
N/A = didn't compete

2013:
Geologic Mapping: 1, 2
Designer Genes: 3, :(
Astronomy: N/A, :(
2014:
Geologic Mapping: 1, N/A
Protein Modelling: 1, N/A
It's About Time: 1, N/A
Forensics: 9, N/A
2015:
Geologic Mapping: 1, ?
Hydrogeology: 1, ?
It's About Time: 1, ?
Forensics: 10, ?

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elephantower
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Posts: 97
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Re: GeoLogic Mapping C

Postby elephantower » September 27th, 2014, 12:03 am

Also, that question was aimed at 2nd year geomappers, so maybe I should do a separate one for the young 'uns ;) .
Here's one that's somewhat difficult, but requires little prior knowledge and should develop necessary spatial analysis skills.

Image
The image above shows an outcrop of quartzite in sedimentary rock, plotted onto a topographic map by an intrepid observer. Does the quartzite form a fold? How can you tell from the map? If it forms a fold, is it an antiform or a synform? Also, if there is a fold, is it an anticline or a syncline? Keep in mind that the fold may not be pointing straight up.
This index of, well, index fossils should help you figure out the relative ages of the rock (Hint: older fossil = older rock)
http://pubs.usgs.gov/gip/geotime/fossils.html
[S/N]
N/A = didn't compete

2013:
Geologic Mapping: 1, 2
Designer Genes: 3, :(
Astronomy: N/A, :(
2014:
Geologic Mapping: 1, N/A
Protein Modelling: 1, N/A
It's About Time: 1, N/A
Forensics: 9, N/A
2015:
Geologic Mapping: 1, ?
Hydrogeology: 1, ?
It's About Time: 1, ?
Forensics: 10, ?


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