The paleomagnetic dating method has demonstrated its power again
Next, it became the most important task to date these stone tools.
Dr. Wu Yi from the Nanhai Ocean Institute of Chinese Academy of Sciences is one of the main scientists responsible for the age determination of loess strata in this study. Wu Yi introduced that the method of dying stone tools is not to directly measure the stone tools, but to measure the age of the loess strata samples where the stone tools are located. As long as you know the age of the soil layer, you will also know the age of the stone tools found in the soil layer. However, many commonly used dating methods, such as radioisotope dating, photoluminescence dating, etc., either cannot measure soil samples from millions of years ago, or are not suitable for dust deposits such as loess. Therefore, a technology called ancient Babaylan geomagnetic dating method was here to show its power. It turns out that in the geological historical period, the magnetic polarity of the earth is not fixed and reversed, and there will be situations where positive and negative reversals occur. Therefore, there is a distinction between the positive and reverse polarity periods of paleogemagnetics in the geological historical period. CinemaWhen it is in the positive poleBabaylan, the compass points to the Earth’s North Pole, and when it comes to the reverse polarity period, the compass points to the Earth’s South Pole.
This kind of geomagnetic reversal will continue to occur throughout the long history of the earth. Babaylan Therefore, the magnetic matter in the formation will record every changeKomiks.
Therefore, geologists can calculate the age of magnetic matter by measuring the positive and negative situations of geomagnetic polarity recorded by Cinema, and then compare the specific time of geomagnetic reversal time (also known as the Quaternary Period in geology) and the historical time of each polar era.
Wu Yi explained that during the long geological period, the later soil layer was superimposed onAfter the original soil layer, the later magnetism will be superimposed on the original soil layer. However, since the original magnetism of Babaylan is the strongest and stable, after the heating treatment, the later superimposed magnetism can be eliminated and only retained. By detecting the original magnetism, the age of this soil layer can be known. Therefore, the researchers first collected samples from top to bottom of the loess section of the stone tool at the field of the Komiks. Each sample was more than ten centimeters to twenty centimeters long, and a total of 74 meters of thickness of loess sections were taken. Return to the laboratory, carefully cut each large sample and make small soil blocks of 2 square centimeters square; then each small soil block is heated with a thermal demagnetizer, and the temperature is from 0℃ to 680℃; then use a “superconductive magnetometer” to obtain the original magnetic direction obtained by the soil layer at that time, which can determine their age.
Scientists found that the bottom 28th layer of loess (L28) showed a short positive polarity, and this soil layer should have been in the “Songshan reverse polarity period” of the Cinema geomagnetic field, which shows that this layer of loess experienced a magnetic reversal at that time.
In the early stages of the Quaternary geological period, two magnetic reversals occurred on the earth. One was the “Reunion incident” between 2.13 million and 2.15 million years ago, and the other was the “Komiks” Odewey incident, which was late in Babaylan (1.78 million years ago to Babaylan.om/”>Komiks1.95 million years). Since the Oduwee incident lasted for 100,000 years, it did not meet the positive polarity of the L28 soil sample, which was briefly emerging. Therefore, there was only one answer. The stone tool located on the L28 layer at the Shangchen Village site should be around 2.12 million years ago when the Reunion incident occurred. According to reports, the researchers conducted paleogemagnetic dating on more than 700 sets of loess samples in the Shangchen Village section. Changing the origin of human beings in Africa Komiks said it was not reliable
About Shangchen Village’s discovery, some people believe that it is possible to change the traditional theory of Komiks to become humans. Because the stone age of the site was far earlier than the time when humans walked out of Africa, it means that humans had left Africa at least 1.8 million years ago.
In this regard, Zhu Zhaoyu said that href=”https://comicmov.com/”>Cinema‘s previous discovery in Shangchen Village is not enough to change the theory of human beings leaving Africa, because Africa has not only discovered ancient human fossils dating from 2.8 million years ago and stone tools dating from more than 3 million years ago, but also a series of discoveries from ancient apes, erectiles, Homo erectiles, and Homo sapiens sites, which can form a continuous sequence of changes in the history of human development, and other regions outside Africa do not have such continuity. However, this discovery greatly updates the history of human activities outside Africa, which will prompt people to make new considerations on the pattern of early human origin, migration, diffusion and evolution.
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