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地壳中的氦主要由两种不同组分构成:一种是由地壳岩石中铀、钍系元素的α衰变来的,其特点是~3He 与~4He 之比约为10~(-8);第二种是地球形成时遗留下来的原生氦,其特点是~3He 与~4He 之比约为10~(-4)。在大洋隆起的玄武岩和接近其伸展中心的深
The helium in the crust is mainly composed of two different components: one is derived from the α decay of uranium and thorium elements in the crustal rocks, and is characterized by a ratio of ~ 3He to ~ 4He of about 10 ~ -8; The second is the native helium left over from Earth’s formation, which is characterized by a ~3He ~ ~ 4He ratio of about 10 ~ (-4). Basalt uplift in the ocean and deep near its stretch center