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Ira
Carpal Tunnel
*****

Reged: 08/22/10

Loc: Mitzpe Ramon, Israel
Where does gold REALLY come from?
      #5976665 - 07/17/13 07:16 PM

We've had discussions on the origin of gold on earth here before. Taking it back to the stellar realm, I thought all elements heavier than iron were made in supernova explosions. Now, here comes a scientific paper that says that gold is made in the collision of two neutron stars. But the findings seem rather speculative based on the evidence presented. And of course, gold could come from both supernovas and colliding neutron stars. Still, I'd like the reaction of the scientist sceptics here on what seems to me to be a speculative stretch by the authors of this finding.

http://www.universetoday.com/103551/earths-gold-came-from-colliding-stars/

/Ira


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llanitedave
Humble Megalomaniac
*****

Reged: 09/26/05

Loc: Amargosa Valley, NV, USA
Re: Where does gold REALLY come from? new [Re: Ira]
      #5976879 - 07/17/13 09:49 PM

Interesting piece. Although it wants to be able to explain all the gold through neutron star collisions, it doesn't make any effort to deny the ability of supernovae to manufacture gold.

Time for some dueling theories!


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Rick Woods
Postmaster
*****

Reged: 01/27/05

Loc: Inner Solar System
Re: Where does gold REALLY come from? new [Re: llanitedave]
      #5977049 - 07/17/13 11:40 PM

Transmuted lead?

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ColoHank
Carpal Tunnel
*****

Reged: 06/07/07

Loc: western Colorado
Re: Where does gold REALLY come from? new [Re: Rick Woods]
      #5977088 - 07/18/13 12:10 AM

Alchemy. Mix eye of newt...

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llanitedave
Humble Megalomaniac
*****

Reged: 09/26/05

Loc: Amargosa Valley, NV, USA
Re: Where does gold REALLY come from? new [Re: ColoHank]
      #5977177 - 07/18/13 01:53 AM

Straw.

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Ira
Carpal Tunnel
*****

Reged: 08/22/10

Loc: Mitzpe Ramon, Israel
Re: Where does gold REALLY come from? new [Re: llanitedave]
      #5977361 - 07/18/13 07:31 AM

Wouldn't the collision of two neutron stars be an exceedingly rare event? And why would it produce gold at all? What happens to two neutron stars that collide with each other? And how about colliding black holes. What do they make?

/Ira


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Otto Piechowski
Pooh-Bah


Reged: 09/20/05

Loc: Lexington, KY
Re: Where does gold REALLY come from? new [Re: Ira]
      #5977371 - 07/18/13 07:44 AM

Where does gold come from?

I live in Kentucky and I KNOW where gold comes from. Fort Knox.

Otto


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Pess
(Title)
*****

Reged: 09/12/07

Loc: Toledo, Ohio
Re: Where does gold REALLY come from? new [Re: Otto Piechowski]
      #5977836 - 07/18/13 12:36 PM

You are all wrong.

My Girlfriend has firsthand knowledge that Gold comes from rich Boyfriends....

Pesse (She says you can close the thread now, we are done here) Mist


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Otto Piechowski
Pooh-Bah


Reged: 09/20/05

Loc: Lexington, KY
Re: Where does gold REALLY come from? new [Re: Pess]
      #5978018 - 07/18/13 02:13 PM

They stole it from Fort Knox. James Bond said so.

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Rick Woods
Postmaster
*****

Reged: 01/27/05

Loc: Inner Solar System
Re: Where does gold REALLY come from? new [Re: Otto Piechowski]
      #5978106 - 07/18/13 03:10 PM

From the Lost Dutchman Mine.

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derangedhermit
Pooh-Bah


Reged: 10/07/09

Loc: USA
Re: Where does gold REALLY come from? new [Re: Rick Woods]
      #5978950 - 07/18/13 11:32 PM

The press release is all about gold, but the referenced submitted paper does not even contain the word. (According to a skimming to find the discussion, and then a search of the pdf.)

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PhilCo126
Post Laureate


Reged: 01/14/05

Loc: coastline of Belgium
Re: Where does gold REALLY come from? new [Re: derangedhermit]
      #5979366 - 07/19/13 08:53 AM

Atomic number 79, least chemical reactive... from the Vredefort crater

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Qwickdraw
Carpal Tunnel
*****

Reged: 03/03/12

Loc: Ann Arbor, MI
Re: Where does gold REALLY come from? new [Re: PhilCo126]
      #5979437 - 07/19/13 09:26 AM

I read that article also and find it counter intuitive at least from my limited knowledge. Seeing as the Earth is ~4 billion years old and considering any gold distributed from such an explosion would be dissipated over a huge area it just seems very unlikely that the early Earth disk could have collected enough gold to account for what we have today.

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star drop
contra contrail
*****

Reged: 02/02/08

Loc: Snow Plop, WNY
Re: Where does gold REALLY come from? new [Re: Qwickdraw]
      #5979467 - 07/19/13 09:44 AM

Speculative conclusions perhaps. I wonder if they saw spectral evidence of super heavy elements (atomic number > 120) and did not realize it?

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Pess
(Title)
*****

Reged: 09/12/07

Loc: Toledo, Ohio
Re: Where does gold REALLY come from? new [Re: star drop]
      #5979661 - 07/19/13 11:31 AM

I always figured Gold and other heavy elements were born in some steller furnace.

What boggles my mind, and I have never really read a good explanation, is how do 'veins' of gold develop in planets?

I mean, gold mines exist because all the gold atoms are ino ne place. How did that happen?

I know diamonds are found together because they are made by local forces. But gold came from somewhere and lumped itself into veins. Same with Silver or copper veins.

If this question has been answered, I'd love to hear it.


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caheaton
Carpal Tunnel
*****

Reged: 05/26/09

Loc: SW Ohio
Re: Where does gold REALLY come from? new [Re: Pess]
      #5979693 - 07/19/13 11:49 AM

Ore veins are the result of hydrothermal vents carrying mineral laden water. The ore crystallizes out of the hot water leaving behind veins of minerals.

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star drop
contra contrail
*****

Reged: 02/02/08

Loc: Snow Plop, WNY
Re: Where does gold REALLY come from? new [Re: caheaton]
      #5979723 - 07/19/13 12:06 PM

Is the gold in the veins in the Earth's crust from relatively recent asteroid accretion or does it up well from deep magma? One would expect that a dense element such as gold to have long ago sunk into the Earth's core barring some unknown high temperature/high pressure repulsion from iron or other core constituents.

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Ravenous
professor emeritus


Reged: 11/14/09

Loc: UK
Re: Where does gold REALLY come from? [Re: star drop]
      #5979732 - 07/19/13 12:13 PM

Most of the heavy (or rather dense) stuff in the Earth is though to have sunk to the core during the iron catastrophe - a long time ago.

The continents are mostly made of the light stuff that floated - but there are small amounts of heavy metals still mixed with them. Not everything got totally mixed, so luckily we're left with a little of these useful heavy things.

Maybe fresh supplies of heavy metals come to the surface in volcanic activity... but that's just a guess. We'd need an expert to help us with that...


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llanitedave
Humble Megalomaniac
*****

Reged: 09/26/05

Loc: Amargosa Valley, NV, USA
Re: Where does gold REALLY come from? [Re: Ravenous]
      #5979738 - 07/19/13 12:20 PM

Most volcanics come from remelted rocks of the crust or upper mantle, so there'll be little or no actual material from the deep Earth coming up.

I'm partial to the idea that a lot of our crustal heavy elements have been brought in by asteroids. One thing I've always had on my curiosity list, but never looked into so far, is a catalog of the elemental composition of the lunar soil. I'm sure there's a lot of asteroid debris mixed in with it, and I'd expect a bit higher concentration of gold and platinum that average in our own crust, since the lunar material has not been recycled downward.


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Pess
(Title)
*****

Reged: 09/12/07

Loc: Toledo, Ohio
Re: Where does gold REALLY come from? [Re: caheaton]
      #5979766 - 07/19/13 12:43 PM

Quote:

Ore veins are the result of hydrothermal vents carrying mineral laden water. The ore crystallizes out of the hot water leaving behind veins of minerals.




I get that but why veins of 'pure' metal?

Why a vein of copper here, a vein of silver over there?

Pesse (And where is the nearest undiscovered vein of gold?) Mist


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