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Could we call these flow lines?
  
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Guitu




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PostPosted: Feb 04, 2018 07:34    Post subject: Could we call these flow lines?  

Hello,
I,ve found some rocks, sorry if irrelevant posting here, does flow lines look like these images?



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Vinoterapia




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PostPosted: Feb 04, 2018 10:04    Post subject: Re: Could we call these flow lines?  

No!!.

If anything, I will call them fracturing induced lines.
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Bob Carnein




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PostPosted: Feb 04, 2018 11:23    Post subject: Re: Could we call these flow lines?  

These features are called hackle plumes or "feather fractures" and are a characteristic of extension fractures (joints) in uniformly fine-grained rrocks.
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Guitu




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PostPosted: Feb 05, 2018 13:03    Post subject: Re: Could we call these flow lines?  

Thanks for your replies,
I take the first image from this thread, this rock is highly weathered, Specific gravity. is 2.67, hardness is more or less 5.5, streak is granular powder like line on black testing stone, which can be erased just using a simple paper, streak color is shown below.

Is it possible to identify those macle or arrowhead shaped black mineral clasts in this rock?



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Kevin Schofield




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PostPosted: Feb 05, 2018 13:18    Post subject: Re: Could we call these flow lines?  

Guitu wrote:
Thanks for your replies,
I take the first image from this thread, this rock is highly weathered, Specific.Gravity. is 2.67, hardness is more or less 5-1/2 (five and half), streak is granular powder like line on black testing stone, which can be erased just using a simple paper, streak color is shown below.

Is it possible to identify those macle or arrow head shaped black mineral clasts in this rock?

It looks as if this rock is a well-cemented, very poorly sorted conglomerate. The picture you showed originally is a large clast within the rock that has broken along a fracture. The other black clasts look like smaller variably-rounded pieces of the same material as the original clast. From the look of it, they are all pieces of a highly indurated, possibly somewhat silty mudstone.
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Guitu




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PostPosted: Feb 06, 2018 07:38    Post subject: Re: Could we call these flow lines?  

Cut & just sanded,,,Sun-lit photos....Does it look like silt, mud or any other type of clay stones?
Can anyone help me identify these mineral clasts and rock?



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Kevin Schofield




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PostPosted: Feb 06, 2018 08:54    Post subject: Re: Could we call these flow lines?  

Guitu wrote:
Cut & just sanded,,,Sun-lit photos....Does it look like silt, mud or any other type of clay stones?
Can anyone help me identify these mineral clasts and rock?


The rock still looks like a well-cemented, poorly-sorted pebbly conglomerate. On the cut surface the matrix looks quite sandy (ie has sand-sized matrix grains between the large clasts). Not possible to really say much about the clasts over and above prior comment that the darker ones look like silty shale. The pebble-sized light coloured one mid-left of the first photograph may be a clast of sandstone.
So if you want an all-singing all-dancing descriptor, I would call it a poorly-sorted (wide assortment of clast sizes) oligomict (clasts of different rock types) depositionally mature (most clasts are well-rounded) conglomerate. Really going out on a limb, one might speculate that it was deposited in a fluvial setting, but without context that is maybe a little BS-ish!
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Guitu




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PostPosted: Feb 06, 2018 09:58    Post subject: Re: Could we call these flow lines?  

Thanks Vinoterapia and Bob Carnein for help. I'll send this rock for further analysis.
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Guitu




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PostPosted: Feb 06, 2018 10:51    Post subject: Re: Could we call these flow lines?  

For the people who doesn't know much about some basic Properties of Conglomerate....

hardness: 2/3
streak: white
Specific Gravity: 2.86-2.88

Hope it will help!
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Kevin Schofield




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PostPosted: Feb 06, 2018 11:11    Post subject: Re: Could we call these flow lines?  

Guitu wrote:
For the people who doesn't know much about some basic Properties of Conglomerate....

hardness: 2/3
streak: white
Specific Gravity: 2.86-2.88

Hope it will help!


Not to be picky here Guitu, but hardness, streak and specific gravity are all attributes of minerals. Although SG may give an indication of the dominant mineral composition of a rock, hardness and streak are not really applicable as diagnostic tools. In this case, a density well in excess of the 2.65 that would be expected if it were a pure quartzite suggests that there are some pretty dense components in there, probably the clay minerals in the shale clasts, and maybe some carbonate cement helping to indurate the rock. Try putting some vinegar on your sawn surface to see if it fizzes...
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Bob Harman




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PostPosted: Feb 06, 2018 11:18    Post subject: Re: Could we call these flow lines?  

While I am not a geologist/mineralogist, I was under the impression that "conglomerate" is a rock and not a mineral. It can be composed of rock and mineral pieces of various sizes and compositions. It is usually sedimentary with the cementing matrix even varying in composition. As such, testing as you briefly describe, is both not usually done nor accurate as the total conglomerate composition can vary quite a bit. Am I right or wrong?

I now see that, while I was writing this posting, KEVIN S was discussing the testing and taking my point of view. BOB
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Roger Warin




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PostPosted: Feb 06, 2018 15:33    Post subject: Re: Could we call these flow lines?  

Hi
These waves may be the result of high local pressures, not to mention any metamorphism.
Do you know the Shatter cones sometimes produced by the impact of a meteorite?
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Guitu




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PostPosted: Feb 07, 2018 06:36    Post subject: Re: Could we call these flow lines?  

Yes Roger Warin, i do know, perhaps looks more like the 2nd image in my 1st post...
Now more about the second image in my 1st post. This rock has Specific gravity of 2.73, hardness is more or less 6,



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Roger Warin




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PostPosted: Feb 07, 2018 14:48    Post subject: Re: Could we call these flow lines?  

Hi,
I think you can have small ripple marks. Ripple marks are sedimentary textures (i.e. bedforms of the lower flow regime) and indicate agitation by water (current or waves) or wind.
Here is a shatter cones from Ries crater (Steinheim Basin - Germany).
These are a multitude of small and steep cones that form a larger cone. The summit of the cones is directed towards the source of the wave, here the impact of a meteorite.



001-Shatter_Cone70326_R.jpg
 Mineral: rock
 Description:
Ries Crater - Germany
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001-Shatter_Cone70326_R.jpg



002-Jonction_Shatter_0188_R.jpg
 Mineral: Rock -
 Description:
Ries Crater - Germany
Shatter cone
Junction
 Viewed:  2125 Time(s)

002-Jonction_Shatter_0188_R.jpg


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Guitu




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PostPosted: Feb 08, 2018 07:33    Post subject: Re: Could we call these flow lines?  

Thanks Roger for posting images,

I have found some crater like places, posting images including some different rocks.
Majority of rocks match that crater like structure, and that's what makes it too difficult to identify a weathered meteorite vs impactite.



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Shatter cone wall, locality Unknown.
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19 (2).jpg
 Description:
Shatter cones / flow lines?
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Guitu




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PostPosted: Feb 08, 2018 07:58    Post subject: Re: Could we call these flow lines?  

This rock is from another crater like place, huge Shock metamorphism/ planer deformation marks found on walls of this venue, so as on this same unknown material rock.This rock could be a meteorite though, never tested, so, meteorites are little bit difficult but not impossible to find.


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Kevin Schofield




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PostPosted: Feb 08, 2018 11:44    Post subject: Re: Could we call these flow lines?  

Guitu wrote:
This rock is from another crater like place, huge Shock metamorphism/ planer deformation marks found on walls of this venue, so as on this same unknown material rock.This rock could be a meteorite though, never tested, so, meteorites are little bit difficult but not impossible to find.


Hi Guitu,
I'm beginning here to feel a little like the geology professor I am some of the time, but I suppose that's OK as these forums are intended to share knowledge and educate each other.
You are most certainly correct that the picture 2(4) is a weathering effect, but unfortunately nothing to do with a meteorite. This is a typical erosion patter seen on steep hillsides of poorly consolidated sediment where fast-flowing water from a storm (or several storms) erodes the slope as it flows down. The chevrons form as the stream flow bifurcates on the steep slope. You can see the original bedding a little towards the top of the picture, particularly in the top right.
The striations on pictures 12, 13, 14 and 15 are saw-cuts. My guess is that they are from a quarry where stone is being dressed for building materials?
Hope this helps with your identifications...

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Veni, Vidi, Emi
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Bob Harman




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PostPosted: Feb 08, 2018 12:50    Post subject: Re: Could we call these flow lines?  

GUITU,

You have now posted several rock examples rather confusing your initial question(s). ROGER W further confused the issue discussing meteor impacts and shatter cones. Then backed off showing a shatter cone from a German impact site and stating your example(s) were more in keeping with water and had nothing to do with a meteorite. This has been backed up by KEVIN S.

Here in Indiana we have the KENTLAND CRATER (also known as the KENTLAND IMPACT SITE or KENTLAND DOME). It is a well recognized impact site in Newton County Indiana with classic shatter cones, not much resembling your examples, but closely resembling the German example shown by Roger W.

I suggest you accept Kevin's ideas about flowing water probably creating the patterns on your rock examples and leave it at that.
BOB
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Guitu




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PostPosted: Feb 08, 2018 13:58    Post subject: Re: Could we call these flow lines?  

Ok professor, you've done me a favor instead, but couldn't help posting last image here.

This specimen is my discovery and in my collection , it's not Eucrite but reminds me LA 001....Cheers!..



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 Viewed:  2015 Time(s)

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3.jpg
 Description:
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