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Thus, the method is used for dating volcanic rocks that contain no argon after the molten lava has cooled, thereby setting the isotopic “clock” to zero.
Care is also required in interpreting radiocarbon ages.
Plant fossils in growth position on a surface over which a landslide travels are ideal material for dating because the landslide killed the plants; in other words, the ages of the fossils and the landslide are the same, given the aforementioned uncertainties.
Uncertainties related to detrital wood ages can be minimized by dating several fragments of wood.
Assuming that each radiocarbon age is reliable, the youngest age will be nearest the age of the landslide.
It may also be useful in dating authigenic minerals (i.e., those formed at the time of deposition) such as glauconite, feldspar, and sylvite in sedimentary rocks (The fundamental assumptions in potassium-argon dating are that (a) no argon was left in the volcanic material after formation and (b) the system has remained closed since the material was produced, so that no argon has either entered or left the sample since formation.
The former assumption may be invalid in the case of some deep-sea basalts, which retain previously formed argon during formation under high hydrostatic pressure.
The same limitations discussed above apply when dating plant material recovered from lacustrine and flood sediments.).
Potassium-argon dating has also been used to date lava flows and volcanic tuff, which in some areas of the world may be juxtaposed with glacial deposits or be stratigraphically related to early hominid fossils.
It is possible, for example, that a dated piece of wood recovered from landslide debris came from a dead tree, rather than from a living one.
Or the wood may have been recycled from older sediments that were eroded by the landslide and incorporated into its deposit.
The outer rings of trees are those that are nearest the time of death of the tree and should be preferentially selected for dating.Tags: Adult Dating, affair dating, sex dating