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地球的起源、年龄、演变是地球史中的重大问题,其中地球的年龄又是地球史中最具体的时间尺度。随着核物理的发展,地球年龄问题的研究有了很大的进展。在核物理发展以前,人们没有很好的方法来精确地计算地球的年龄。1899年,乔里(Joly)建议用海水中含盐量来计算海洋的年龄。他假定原始海水是淡的,并假定每年由江河的流水带进海洋的盐份接近常数,这样就可以把今日全部海水内的含盐量被除于每年流入量,求得海水达到今日碱度的年数。据估计,每年有1.5×10~(14)克的钠流入海洋,
The origin, age and evolution of the earth are major issues in the history of the earth. The age of the earth is the most specific time scale in the history of the earth. With the development of nuclear physics, great progress has been made in the study of the issue of the age of the earth. Before the development of nuclear physics, people did not have a good way to accurately calculate the age of the Earth. In 1899, Joly suggested using the salinity of seawater to calculate the age of the sea. He assumed the crude seawater was light and assumed that the annual salinity brought into the oceans by the flowing water from the rivers was close to constant so that the salt content of all seawater today was divided by the annual inflow and the seawater was found to have reached the alkalinity of today The number of years. It is estimated that each year 1.5 × 10 ~ (14) grams of sodium flows into the sea,