How old is a gypsum desert rose?
How are they formed and how long does it take.
How long ago would they have been formed in the UK ?
I got one at the caves at Cheddar Gorge in the UK.
Gypsum roses are very common in arid zones throughout the world where there is an abundance of calcium in the groundwater and dissolved sulphate ion – probably from pyrite decomposition. Gypsum roses form in soft sandy sediments at depths of up to 3 or 4 metres, usually in drainage depressions such as perennial lake beds, inter-dune playa lakes, or broad floodplains. Usually old shallow marine sedimentary rocks are present nearby – these are the source of the calcium and sulphur to make gypsum. The gypsum crystallises into roses is there is a constant supply of groundwater, and if the sediment has a high porosity and permeability.
The time taken to form gypsum roses would be measured in hundreds to thousands of years, depending upon the concentration of gypsum in the groundwater, and the right conditions to force the gypsum out of solution (usually related to alternating periods of wet and dry which recharge the water table and subsequently result in increased concentration of gypsum to promote crystal growth).
Without familiarity with the geology of the site in the UK I would suggest that they would still only be up to several thousand years old. Gypsum roses are still water soluble, and if groundwater compositions and pH change too much they can dissolve again – so it is unlikely that they are too old or they may not have survived previous climate changes.
Sting – Desert Rose
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