BajaNomad

Rock question

BMG - 1-2-2009 at 01:31 PM

We were out for a walk on New Year's day and stumbled across this rock with some unusual colored bands in it. Anyone know what would cause these bands of red and yellow?





DENNIS - 1-2-2009 at 01:32 PM

Spray paint?

BMG - 1-2-2009 at 02:12 PM

Quote:
Originally posted by DENNIS
Spray paint?


I don't think so. I think spray paint looks more like this.

IMG_8389.JPG - 35kB

Mexitron - 1-2-2009 at 02:17 PM

Looks like granite surrounding the colored rock--I've seen sedimentary rocks "cooked" by granite batholith in the Sierra San Pedro Martir resulting in some banding... ...or perhaps leached salts/crystals from weathering...? Those are my two guesses de jour...

Barry A. - 1-2-2009 at 02:18 PM

I will take a stab at it--------

Looks like a eroded out cross-section of a anticline, or techtonic rock fold. Coloring in rocks is usually the result of mineral concentrations, but not sure of what the actual colors in your picture represents. That is a neat geological find.

Barry

longlegsinlapaz - 1-2-2009 at 02:26 PM

A prehistoric rainbow etched in stone!:bounce::bounce: Bands of minerals would be my second guess. ;)

Pompano - 1-2-2009 at 02:54 PM

Beats me, the girl next to me in Geology 101 was gorgeous.

Google says.....mesomorphic origins, banding is due to volcanic flows.

Barry A. - 1-2-2009 at 05:28 PM

Quote:
Originally posted by Pompano
Beats me, the girl next to me in Geology 101 was gorgeous.

Google says.....mesomorphic origins, banding is due to volcanic flows.


I believe that would be "metomorphic", not meso. Layering, like is in the photo, does indicate sedimentary or volcanic origin, and the bending of those layers as seen in the photo causes extreme heat which "cooks" the layers and changes them considerably (metamorphous). Volcanic stuff is frequently red, black, yellow, and colors in-between----so there could be several explanations.

I still think that place in the photo is rather remarkable, and worth remembering where that is.

I would bet that Pomp has bought a "Sleep Number" bed strickly because Lindsey Wagner is pushing them. :lol:

Barry

[Edited on 1-3-2009 by Barry A.]

Pompano - 1-2-2009 at 05:30 PM

Meso..meto...shamesso...I told you she was good looking.

Barry A. - 1-2-2009 at 05:32 PM

Quote:
Originally posted by Pompano
Meso..meto...shamesso...I told you she was good looking.


----------and with that comment, I went back and edited my post above. :lol:

Barry

Pompano - 1-2-2009 at 07:18 PM

Barry...who is Lindsey Wagner??

..edited for spelling police. I am assuming Lindsey is a looker, right? Well, if she is younger than my daughter I am not interested. Plus I tried that type of mattress right after the water-bed fiasco.

[Edited on 1-3-2009 by Pompano]

longlegsinlapaz - 1-2-2009 at 08:51 PM

Pompano, Lindsey was The Bionic Woman....remember? And somehow I doubt she's younger than your daughter, she was a year behind me at my HS, so that'd put her right around 60ish; she was a couple years behind the Kingsmen of Louie, Louie fame....& Sam Eliot....Yellow Rose of Texas fame, amongst many others.

THE BIONIC WOMEN&BIONIC MAN

BAJACAT - 1-2-2009 at 09:27 PM

JAIME SOMMERS (BIONIC WOMAN)
STEVE AUSTIN(BIONIC MAN)

here goes another thread hijack by the BNHIJACKERS:cool:

I think you've stumbled upon...

Mexray - 1-2-2009 at 09:41 PM

...a Rainbow Warrior's headstone...:o

Barry A. - 1-2-2009 at 10:42 PM

Quote:
Originally posted by Pompano
Barry...who is Lindsey Wagner??

..edited for spelling police. I am assuming Lindsey is a looker, right? Well, if she is younger than my daughter I am not interested. Plus I tried that type of mattress right after the water-bed fiasco.

[Edited on 1-3-2009 by Pompano]


Pomp--------I have been sleeping on a Select Comfort (Sleep number) bed for 10 years (without Lindsey, darn it) and they are GREAT!!!!

Barry

BMG - 1-3-2009 at 09:13 AM

Quote:
Originally posted by Barry A.

I still think that place in the photo is rather remarkable, and worth remembering where that is.


Thanks for the rock info. I have walked over this rock many times before and finally stopped to take some photos.

Bwana_John - 1-3-2009 at 06:54 PM

OK, Ill try,

The colors themselfs are from hemitite and limonite, oxides of iron, basicly rust.

The colors being "banded" or "layered" could possibly be a concretion in sedimentary rock, or if volcanic due to diferent minerels being deposited by a many sucessive volcanic flows, in either rock type due to diferential weathering conditions under the ground like different climates when exposed, or ground water level that changed, or the rock was partilly exumed then recovered, or a combination of these.

It could be flow banding in metamorphic rocks, but I dont think so, I think diferential weathering.


[Edited on 1-4-2009 by Bwana_John]