Problems With Dating Metamorphic Rocks

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Thus, the U-Pb isochron method of dating igneous and metamorphic rocks composed of silicate minerals does not work in most cases because of the variable losses of U by chemical weathering, which occurs not only at the earth's surface, but also in the subsurface where rocks are in contact with oxygenated groundwater .
What are based are several methods . 2021-5-13 in the age of rocks can differ by a unique problem is an important flaw in a on from a method of dating . 2019-4-29 . In metamorphic rocks have worked on the issues raised here is a steady states occur, the composition of years . That every geologist must make when using naturally occurring .
Dating metamorphic rocks Should a simple igneous body be subjected to an episode of heating or of deformation or of a combination of both, a well-documented special data pattern develops . With heat, daughter isotopes diffuse out of their host minerals but are incorporated into other minerals in the rock .
Is radiometric dating possible on metamorphic rocks ? Yes, it is . Some zircons (to give you a classical example) can grow or re-grow in metamorphic settings . In simpler words they grow new rims, rims that can give you the age of one of the metamorphic stages . You can use other minerals to get the age of the peak of metamorphism etc .
Radioactive dating is a method of dating rocks and minerals using radioactive isotopes . This method is useful for igneous and metamorphic rocks , which cannot be dated by the stratigraphic correlation method used for sedimentary rocks . Over 300 naturally-occurring isotopes are known .
Absolute age dating is a powerful tool for unraveling the geological history of a region, but we have seen that we must ultimately rely upon igneous rocks (that may have later metamorphosed) for the minerals that we are able to date (see the next section for issues with dating sedimentary rocks directly) . Another issue with absolute age dating is that it is expensive, with a single analysis costing several hundreds of dollars .
In order to use the K-Ar dating technique, we need to have an igneous or metamorphic rock that includes a potassium-bearing mineral . One good example is granite, which normally has some potassium feldspar (Figure 8 .4 .2) . Feldspar does not have any argon in it when it forms .
Problems with dating metamorphic - Metamorphic rocks cause problems , as minerals become closed systems at different temperatures . - Parent and daughter atoms can be lost or gained during heating events .
Volcanic rocks . 87 Rb Rubidium-87: 87 Sr Strontium-87: 47 billion: 10 million - 4 .6 billion: Minerals include muscovite, biotite, K-feldspar . Igneous or metamorphic rocks . 14 C Carbon-14: 14 N Nitrogen-14: 5,730 years: 100 - 70,000 years: Not used for dating rocks , except carbonates from earth's surface such as recent coral reefs .
Problems with radiometric dating of sedimentary rocks . Often you are dating fragments of pre-existing rocks . Weathering can lead to loss of gases (40Ar) . Minerals with radioactive isotopes are rare - only glauconite e .g . in Greensand . Problems with radiometric dating of metamorphic rocks .
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Problems With Dating Metamorphic Rocks