What process created this?

beem · « **Reply #20 on:** 04/02/2009 04:20:02 »

oh, sure, frethack...the moment I get up enough courage to guess...er...a...draw upon what I've learned here, you hit me with a question that'll put me back where I belong...among the uninitiated [

] [

]

Answer: (drumroll) tectonic.

I'll answer your next question before you can pose it... [^]
Because of the red stuff in there.
More why: The red stuff entered during a heat episode while deep in the ground.

(OMG, somebody help me out of this hole I'm digging myself into.

End my misery by telling me what the red stuff is.
Hopefully not blobs from a dripping grease gun. [

]

frethack · « **Reply #21 on:** 04/02/2009 05:25:32 »

Sorry beem, I was being a bit vague. I was actually referring to this pic:

I should have pasted the pic in my response...sorry bout that!

beem · « **Reply #22 on:** 04/02/2009 05:36:19 »

Oh!
Schist!
[:I]

Bass · « **Reply #23 on:** 04/02/2009 06:33:04 »

Beem, you guessed right!! [:0]

Quote

Oh, Oh, someone get Bass into his chains.! This is his favorite rock - a breccia. He will surely give the lecture on this specimen.

And since JimBob asked so nicely...

Tectonic breccia- no doubt. Note that the clasts are all the same material, and that there is little rotation with matching boundaries.

Solution collapse breccias typically contain a mix of clast types (but not always), and the clasts are obviously displaced- rotated, no matching clast boundaries, may be rounded, and are commonly coated with calcite rims or drusy calcite and/or quartz.

There are two obvious fault structures cutting the rock, one from the upper right to the lower left, and another from the upper left to the middle where it gets cut off by the first fault.

beem · « **Reply #24 on:** 04/02/2009 17:18:52 »

So #6 rock is a gneiss.
And the red intrusions?
low-grade garnet? or? [?]

#4 rock is a breccia...I still don't get that one. [

]
Once the snow's gone I'll locate it and try to remove all the white and orange stuff to locate the jagged broken pieces typical of breccia.

Thank you.

Bass · « **Reply #25 on:** 04/02/2009 18:16:37 »

Quote from: beem on 04/02/2009 17:18:52

So #6 rock is a gneiss.
And the red intrusions?
low-grade garnet? or? [?]

Possibly garnet, but more likely iron staining (iron oxides)

JimBob · « **Reply #26 on:** 04/02/2009 20:04:03 »

Quote from: Bass on 04/02/2009 06:33:04

Beem, you guessed right!! [:0]

Quote
Oh, Oh, someone get Bass into his chains.! This is his favorite rock - a breccia. He will surely give the lecture on this specimen.

And since JimBob asked so nicely...

Tectonic breccia- no doubt. Note that the clasts are all the same material, and that there is little rotation with matching boundaries.

Solution collapse breccias typically contain a mix of clast types (but not always), and the clasts are obviously displaced- rotated, no matching clast boundaries, may be rounded, and are commonly coated with calcite rims or drusy calcite and/or quartz.

There are two obvious fault structures cutting the rock, one from the upper right to the lower left, and another from the upper left to the middle where it gets cut off by the first fault.

Bass, you are a Lord among men.

_____________________________

Hey, all the rest of you rabble, it is time to storm the castle and dispose of the despot!

Bass · « **Reply #27 on:** 04/02/2009 20:19:11 »

Chatter chatter shiver
clank clank

slowly drags his chains through the cold, dark dungeon in a solution cavity... [

]

JimBob · « **Reply #28 on:** 05/02/2009 01:46:16 »

It is called an oubliette.

beem · « **Reply #29 on:** 05/02/2009 18:25:42 »

Oubliette-residents come out and see the light of day, just like this fossilized leaf:

Obviously a sedimentary deposit, is it a birch leaf? beech? alder? elm?
Leaf is 4.6 mm long.

Evie · « **Reply #30 on:** 25/02/2009 20:06:23 »

Some educated guesses based on leaf shape are black cherry, beech, white birch, or ash; I would lean towards the last two.

This site told me it could be a common pear: http://www.ag.auburn.edu/hort/landscape/leafid/index.php/

Give it a try!

dentstudent · « **Reply #31 on:** 25/02/2009 20:39:50 »

Sorry - Did you say 4.6 mm long? That is very small!

JimBob · « **Reply #32 on:** 26/02/2009 01:02:21 »

Quote from: Evie on 25/02/2009 20:06:23

Some educated guesses based on leaf shape are black cherry, beech, white birch, or ash; I would lean towards the last two.

This site told me it could be a common pear: http://www.ag.auburn.edu/hort/landscape/leafid/index.php/

Give it a try!

Hi Evie,

Good to see you again!

Post a question and liven up this coffin!

beem · « **Reply #33 on:** 28/02/2009 22:47:36 »

sorry that leaf length is 46 mm.

Thanks for the leaf link...common birch seems most likely.

Rock #7, sorry for poor quality.

Thanks!

DoctorBeaver · « **Reply #34 on:** 01/03/2009 18:32:15 »

Welcome to the inaugural meeting of the RHSAS (Rock Huggers Self-Appreciation Society) [

]

frethack · « **Reply #35 on:** 01/03/2009 20:08:29 »

Looks like you have a very nice gneiss on your hands.

JimBob · « **Reply #36 on:** 03/03/2009 03:11:47 »

Quote from: DoctorBeaver on 01/03/2009 18:32:15

Welcome to the inaugural meeting of the RHSAS (Rock Huggers Self-Appreciation Society) []

Hello, I would like to thank the president of the society for starting this farce - er, group. We will hold meetings ever day, all day and throw the rock we are hugging at other members. Thank you for drooping by - and we do mean droop.

Bass · « **Reply #37 on:** 04/03/2009 16:56:35 »

Quote from: beem on 28/02/2009 22:47:36

Rock #7, sorry for poor quality.

Thanks!

Quote from: frethack

Looks like you have a very nice gneiss on your hands.

Not so sure that this rock is a gneiss. Beem, how hard are the white and dark layers in this specimen, can you scratch them with a knife?

Looks more like a sedimentary rock (shale? carbonate?) with solution/replacement veins (quartz? calcite?) Can you try dripping a bit of hydrochloric acid on the rock?

Your photo is upside-down, I instinctively try to duck out of the way so it won't hit me when it falls off the computer screen

beem · « **Reply #38 on:** 04/03/2009 18:14:05 »

Quote

how hard are the white and dark layers in this specimen, can you scratch them with a knife?

That'll have to wait a while...it's presently still under a foot of snow. [

]

So much for my orienting the image...
Hanging rock...so not to trip over it [

]
Thanks.

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What process created this?

beem (OP)

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