How old is the schist in the Douro?
Moderators: Glenn E., Roy Hersh, Andy Velebil
How old is the schist in the Douro?
Enjoy the exploration and please do share your sources.
Ambition driven by passion, rather than money, is as strong an elixir as is Port. http://www.fortheloveofport.com
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Re: How old is the schist in the Douro?
According to this paper, it began 540 millions years ago
http://www.ipa.min-cultura.pt/coa/sh__r ... ndes06.pdf
http://www.ipa.min-cultura.pt/coa/sh__r ... ndes06.pdf
Living the dream and now working for a Port company
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Re: How old is the schist in the Douro?
350-400 Million years ago if there is a likewise development as in Germany.
BTW: Schist is quiet often used here for roof tile.
http://de.wikipedia.org/wiki/Schiefer
BTW: Schist is quiet often used here for roof tile.
http://de.wikipedia.org/wiki/Schiefer
Shut Up 'N Drink Yer Port
Re: How old is the schist in the Douro?
Mr. Miller,
But is the schist there in vertical or horizontal strata?
But is the schist there in vertical or horizontal strata?
Ambition driven by passion, rather than money, is as strong an elixir as is Port. http://www.fortheloveofport.com
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Re: How old is the schist in the Douro?
Roy, my surname is not Miller. Probably a confusion.Roy Hersh wrote:Mr. Miller,
But is the schist there in vertical or horizontal strata?
According to my humble understanding the geologic formation of shist is identically proceeded in Europe. Sources in Europe are mainly in Slovenia, Croatia, Greece, Italy, Czech Republic, Poland, Norway, Hungary, Sweden, Switzerland, Portugal, Spain, France, Begium, Luxemburg, Great Britain, Ireland and Germany.
As on the graph shown, it is apparently in a vertical strata. But naturally I do not have neither an education nor a deeper knowledge in geological matters so that my interpretation may be inapplicable.
http://www.baunetzwissen.de/standardart ... ut=galerie
Michael
Shut Up 'N Drink Yer Port
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Re: How old is the schist in the Douro?
I did a bit of research and I came across wildly differing opinions as to the age of the schist in the Douro. One article (http://www.vinfolio.com/vinfolioblog/20 ... hist-1.jsp) mentions 300 million years as the approx. age of Douro schist, which I do tend to believe. But...in another article on the geology of that area, actually it focused on the Vinho Verde region but the two bands of schist they were examining extended across and south of the Douro, the age was given as either 2.5 billion-4.5 billion years for one band or 350 million-320 million years for the other band. It seems to me that the younger band is probably the dominate source of schist in the Douro, so 350-320 million years appears to be a good estimate.
Marc
Marc