Question from a novice , about Uranium Thorium dating of stalactites / speleotherms .

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2 total messages Started by kangarooistan Wed, 27 Jun 2012 18:59

#656

Author: kangarooistan
Date: Wed, 27 Jun 2012 18:59

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Question from a novice , about Uranium Thorium dating of stalactites /
speleotherms .
Having spent some time online google searching , I m still not sure
if it is possible to date relatively recent '' calcite deposits ''
using modern uranium thorium method , it clearly being done on samples
much older , within the archaeology field it has been used to date
rock art 30,000 plus years old .
http://en.wikipedia.org/wiki/Speleothem#Absolute_dating ,
.
this '' old iron tool '' was found in an old mine site , I NOTE
there is a modestly thick and visible layer of ''calcite sand
grains'' on it , that fell from the roof and or sides of the old
mine , before the mine collapsed and buried the '' old iron tool ''
on the site with the entire mass then set into a conglomerate of
mixed minerals as shown here .
https://picasaweb.google.com/107516779059962399739/AncientMiningResearchSouthAustralia#5457486605114653986
.
my questions are assuming iron tools must be aged from between about
5000 years old and may be relatively very recent , can existing
tests date the '' cave popcorn '' accurately , withing this
rather young age range , certainly a lot less than 5000 years ?
1. would it be possible to date this '' cave popcorn '' calcite
sand
2. and where in australia can I have this done ?,
3. and how much would it cost ?
.
Cave popcorn, or coralloids, are small nodes of calcite, aragonite or
gypsum that form on surfaces in caves, especially limestone caves.[1]
[2] They are a common type of speleothem.[1][2]
http://en.wikipedia.org/wiki/Cave_popcorn

Re: Question from a novice , about Uranium Thorium dating of stalactites / speleotherms .

#657

Author: kangarooistan
Date: Fri, 29 Jun 2012 03:55

40 lines
3758 bytes

On Jun 28, 3:59 am, kangarooistan <kangarooist...@gmail.com> wrote:
> Question from a novice , about Uranium Thorium dating of stalactites /
> speleotherms .
>   Having spent some time online google searching ,  I m still not sure
> if it is possible to date relatively recent '' calcite deposits ''
> using modern uranium thorium method , it clearly being done on samples
> much older , within the archaeology field it has been used to date
> rock art  30,000 plus years old  .
>  http://en.wikipedia.org/wiki/Speleothem#Absolute_dating ,
> .
> this '' old iron tool ''  was found in an old mine site ,    I NOTE
> there is a  modestly  thick and visible layer of  ''calcite  sand
> grains''  on it ,  that fell from the roof and or sides of the old
> mine ,  before the mine collapsed and buried the '' old iron tool ''
> on the  site with the entire mass  then set into a conglomerate  of
> mixed minerals  as shown here .https://picasaweb.google.com/107516779059962399739/AncientMiningResea...
> .
> my questions are assuming iron tools must be aged from  between about
> 5000 years old and  may be  relatively  very recent , can existing
> tests date  the  '' cave popcorn ''  accurately  , withing this
> rather young age  range , certainly  a lot less than 5000 years ?
> 1.  would it be possible to date this  '' cave popcorn '' calcite
> sand
>  2. and where in australia can I have this done ?,
>  3. and how much would it cost  ?
>  .
> Cave popcorn, or coralloids, are small nodes of calcite, aragonite or
> gypsum that form on surfaces in caves, especially limestone caves.[1]
> [2] They are a common type of speleothem.[1][2]http://en.wikipedia.org/wiki/Cave_popcorn

https://picasaweb.google.com/107516779059962399739/AncientMiningResearchSouthAustralia#5457486605114653986
note the two square quartz cubes in the center of picture , the clear
quartz cube has a hole drilled through the center , clearly a bead ,
and a short gold wire of similar diameter , is exposed and visible ,
embedded within the above conglomerate , but not on this side , and
not easily seen online

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