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Messages - skydiamonds

Pages: [1]
1
Geology, Palaeontology & Archaeology / Re: Can one test volcanic rocks to determine the age of a past eruption?
« on: 05/11/2018 20:28:19 »
Theoretically possible. But if you ask who can do it, what firm, I don't know
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Geology, Palaeontology & Archaeology / Re: Can one test volcanic rocks to determine the age of a past eruption?
« on: 04/11/2018 18:12:42 »
The last photo you posted, if that is a boulder, certainly looks like lahar. The USGS describes " Lahar is an Indonesian term that describes a hot or cold mixture of water and rock fragments that flows down the slopes of a volcano and typically enters a river valley."- basically a mudflow from a volcano that is usually full of fragments.
Interesting that the volcano is considered "extinct" if there is still magma below and hot springs- maybe "dormant"?
Yes, it can be age dated. The most accurate way to date the rocks is radiometric age-dating, which requires a lab (or university) that specializes in that sort of work, and probably best to have the sample taken by a professional. Depending on the age of the rock, K-Ar might be best.
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3
Geology, Palaeontology & Archaeology / Re: Can one test volcanic rocks to determine the age of a past eruption?
« on: 05/10/2018 23:57:34 »
The rocks in your photo certainly could be volcanic- but I couldn't make our enough detail to tell for sure. Did you see any crystals in the rocks? Andesites commonly have both black and white crystals.
As to the age, probably Potassium-Argon would give you the best radiometric readings to determine age if it's volcanic. Why do you think this is "last" eruption? Volcanic lava flows are notoriously local and tend to fill low spots in the topography, so this may have been covered by even younger flows.
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