How do scientists determine the age of fossils or fossils?

 How do scientists determine the age of fossils or fossils? When paleontologist Mary Schweitzer discovered soft tissues in a fossil of Tyrannosaurus rex, the question was how did these tissues survive so long?

The age of these discovered bones was 65 million years, and what I know about fossilization is that all soft cells degrade, whether it is blood or brains. Only hard parts like bones and teeth can become fossils. But on the other side, the discovery raised a different question for some people, which is how scientists know if the age of the fossils is really 65 million years old.

 

Our knowledge today of the age of fossils or fossils is based mainly on radiometric dating. This method is based on the properties of isotopes, which are similar chemical elements such as carbon and uranium except for one main property, which is the number of neutrons in each nucleus. Usually an atom contains an equal number of protons and neutrons, and the atom becomes unstable if there are many or few neutrons, and then the atom gets rid of the particles until the nucleus settles.

Think of the nucleus as a pyramid from the building blocks. If you try to add new blocks to the edges of the pyramid, it may last for some time, but it will often collapse. The same is the case when you take a building block from the side of the pyramid, in which case the rest of it will be unstable. Finally, some of these blocks may fall off, leaving a smaller, more stable building. The result would be like a radioactive clock that would sound as the unstable isotopes morphed and decomposed into stable ones.

We cannot predict when an unstable or parent atom will transform and degrade into a stable daughter atom, but we can extrapolate how long it will take for a large group of atoms to degrade and decay.

The life-half element's degradation half-life is the amount of time it takes for one half of the parent atom to transform into a daughter. To read the time on this radiating watch, scientists use a device called a mass spectrometer to measure the number of parent and daughter atoms. The ratio between them determines the age of the sample, so the more isotopes the parent and the erdaught are few, the younger the sample is.

Measuring the half-life of isotope degradation is a very important factor when determining how effectively the age of very old samples is determined. Whenever all of the parent atoms, arentp, are transformed into a daughter, it becomes difficult to have rules for comparing the two isotopes. Scientists cannot determine whether the clock has worked for a few hours or millions of years, which means that isotopes with short half-lives cannot be used to determine the age of dinosaur bones.

The short dissolution half-life is just part of the problem when determining the age of dinosaur bones . Scientists must also find enough parent and daughter atoms to perform the measurement. By completing the reading, we will learn what is needed to determine the age of the fossil and what the relationship of volcanic ash to this.

Determine the age of sedimentary rocks

Carbon-dating is one of the most common types of radiometric dating of fossils.This is the method that archaeologists use to determine the age of man-made artifacts, but this method will not work when applied in the case of dinosaur bones, as the decay half-life of carbon-14 is only 5,730 years. Therefore, this method is effective when used in specimens that are less than 50,000 years old, while dinosaur bones are at least millions of years old, and some other fossils are billions of years old. To determine the age of these fossils, scientists need an analogue with a very long decay-life.

The isotopes uranium-382, uranium-352 and potassium-04 are used in these cases as each of them has a half-life of more than a million years.

Unfortunately, these elements are not even found in dinosaur fossils themselves. They are found in igneous rocks or rocks made from cooled magma. In general, fossils or fossils are formed inside sedimentary rocks where sediments cover the body of the dinosaur and the sediments and bones gradually turn into rocks, but these sediments do not necessarily contain the desired isotopes in reasonable and sufficient quantities. On the other hand, fossils or fossils do not form inside igneous rocks that contain the required isotopes due to the high temperature of the magma, which may lead to the destruction of the bones.

Therefore, to determine the age of sedimentary rock layers, scientists must first find adjacent layers of the earth that contain igneous rocks such as volcanic ash, where these layers work as the two books of the book, giving the beginnings and ends of the time period in which the sedimentary rock was formed, and by using the radiometric age determination method to determine the age of igneous rocks Determine the exact age of sedimentary rock layers between them.

Scientists have been able to determine the age of rock strata all over the world using major methods such as bracketing and radiometric dating.

While the oldest known rock on Earth is about 3.5 billion years old, scientists have unearthed zircon crystals that are 4.3 billion years old.

Based on the analyzes conducted on these samples, scientists estimated the age of the Earth at 4.5 billion years. In addition to this, the oldest moon rocks are 4.5 billion years old, and since the earth and the moon were formed at the same time, this supports the current idea of ​​the age of the earth.

Some other methods of determining the age of the fossils or fossils

Radiographic age determination is not the only way to determine the age of rocks. Other methods include analyzing amino acids and measuring changes in the magnetic field surrounding the object being tested.

Scientists have also made some improvements to standard radiometric measurements.For example, using lasers, scientists can measure infinitesimal amounts of parent and daughter atoms in the materials being analyzed, which makes it possible to determine the age of samples of very small size.