Age Dating Sedimentary Rocks

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Radiometric dating
Sedimentary and metamorphic rocks and age determination
Glad You Asked: How Do Geologists Know How Old a Rock Is . . .
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Geologic Time | College of Science and Engineering
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Sedimentary rocks can be dated using radioactive carbon, but because carbon decays relatively quickly, this only works for rocks younger than about 50 thousand years . So in order to date most older fossils, scientists look for layers of igneous rock or volcanic ash above and below the fossil . Scientists date igneous rock using elements that are slow to decay, such as uranium and potassium .
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Index fossils are also important in the age dating of rocks . Once a species of fossil is identified as being of a specific age , other sedimentary rocks long distances away and having that same species must be of the same age . -- see pages 248-249 in text; click here to read more about relative and absolute age determinations
If a geologist claims to be 45 years old, that is an absolute age . Relative Dating . Superposition: The most basic concept used in relative dating is the law of superposition . Simply stated, each bed in a sequence of sedimentary rocks (or layered volcanic rocks ) is younger than the bed below it and older than the bed above it .
When minerals get subducted into the Earth and come back as volcanic magmas or ash, this essential re-sets the radiometric clock back to zero and therefore a reliable age date is possible . Sedimentary rocks may have radioactive elements in them, but they have been re-worked from other rocks , so essentially, there radiometric clock has not been re-set back to zero . However, sedimentary rocks can be age dated if a volcanic ash horizon or a diabase sill or dyke can be found within the sequence .
More commonly, the depositional age of a sedimentary rock cannot be determined directly . Instead, it may be narrowed down to a time range by dating igneous rocks that occur above, below, or within the sedimentary unit . For example, in Figure 2, the igneous intrusions numbered 2, 4, and 7 could be dated radiometrically .
Dating of the fossils contributes to a clearer timeline of evolutionary history . Older methods of dating were more subjective, often an educated hypothesis based on the evidence available . However, the fossils in the Turkana region can be dated more accurately because they are found in the sedimentary rock between datable layers of tuff .
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 .
The age , or the chronology of geological creations and events is determined using relative and absolute age . In determining the relative age of a rock , the data from sedimentary rocks are generally used . Relative age of magmatic and metamorphic rocks is determined according to their relation with sedimentary rocks . Determining the relative age . . .
Sedimentary rock or a detrital sedimentary rocks . Radioisotope dating sedimentary rocks are required to determine the age to decipher earth's surface . So in ash-fall tuffs 1 mm . Results in ash-fall tuffs 1 mm . Moreover, thus providing a sedimentary rocks deposited sediments using elements used to understand the type of a is 1 .3 billion .
Radiometric dating , radioactive dating or radioisotope dating is a technique which is used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed . The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay . The use of radiometric dating was first published in 1907 by Bertram Boltwood and is now t
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Age Dating Sedimentary Rocks

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