Age Dating Metamorphic Rocks

Sedimentary and metamorphic rocks and age determination
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in figure 1 determine the absolute age date of formation B: A is older than B which is older than C (from the law of superposition)--igneous intrusive, V was dated at 2 .15 million years--lava flow, P was dated at 2 .25 million years (both V and P were dated using an absolute age determination method)--since V bakes (metamorphoses) B, B is older than intrusive V ( B is greater than 2 .15 million years)--since lava flow P does not bake (metamorphose) B, B is younger than P (B is less than 2 .25 . . .
Age-dating of metamorphic rocks also is usually accomplished using radioactive materials . The processes of determining the age of metamorphic rocks often can be fraught with formidable difficulties . Fortunately, vanishingly few fossils occur in metamorphic rocks , so we can pass on quickly to - sedimentary rocks .
Dating - Dating - 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 .
It is useful for dating very old igneous and metamorphic rocks and also meteorites and other cosmic fragments . However, there is a limited range in Sm-Nd isotopes in many igneous rocks , although metamorphic rocks that contain the mineral garnet are useful as this mineral has a large range in Sm-Nd isotopes .
Igneous and metamorphic rocks , which were once extremely hot and have cooled into solid rock , are dated using the following methods: uranium-238 to lead-206, uranium-235 to lead-207, potassium-40 to argon-40, and rubidium-87 to strontium-87, and are viewed as capable of providing an "absolute" age since solidification .
Radiometric dating of minerals in metamorphic rocks usually indicates the age of the metamorphism . Radioactive decay series A number of elements have isotopes (forms of the element that have different atomic masses) that are unstable and change by radioactive decay to the isotope of a different element .
As most fossils are found in clastic sedimentary rocks , which are made of weathered and eroded minerals and bits of rock of various ages , it is unlikely to be able to make an radiometric age determination of a rock in which a fossil is found . The age of a rock containing fossils can usually be narrowed down by measuring the ages of metamorphic or igneous rocks in stratigraphic relation to it, such as a lava flow on top of a layer of sedimentary rock .
Relative age of magmatic and metamorphic rocks is determined according to their relation with sedimentary rocks . Determining the relative age of a rock . The determination of the relative age of a rock is based on the principle of original horizontality of the sediments, principle of superposition, principle of original lateral continuity, principle of cross-cutting relationships, principle of inclusions, principle of biological succession and the lithology of a rock .
A metamorphic rock can provide an age for the last metamorphic event . Ý If the rock experienced more than one episode of metamorphism, then usually only the most recent event can be dated . Isotopic Dating of Sedimentary Rocks ? In general, clastic sedimentary rocks do not give meaningful ages because the minerals contained in these rocks were derived from other sources . Ý At best, clastic minerals can only provide the age (s) of their parent source rocks . Isotopic Dating of Sedimentary Rocks ?
This scheme is used to date old igneous and metamorphic rocks , and has also been used to date lunar samples . Closure temperatures are so high that they are not a concern . Rubidium-strontium dating is not as precise as the uranium-lead method, with errors of 30 to 50 million years for a 3-billion-year-old sample .
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Age Dating Metamorphic Rocks