given in concise form in parentheses after the corresponding last digits. All degassed helium is lost to space eventually, due to the average speed of helium exceeding the escape velocity for the Earth. Check date values in: access-date ( help ) Park,.; Atlas,. ReOs edit Arne., Bierlein.
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Nitrogen edit Nitrogen has two stable isotopes, 14N, and 15N. Due to similarities in helium and carbon in magma chemistry, outgassing of helium requires the loss of volatile components ( water, carbon dioxide ) from the mantle, which happens at depths of less than 60 km. "Multiple fluid pulses in a Samoan harzburgite ". This requires significant lithium to adversely affect the 3He/4He ratio. 2, the stable carbon isotopes are fractionated primarily by photosynthesis (Faure, 2004). R usually is given as a multiple of the present atmospheric ratio ( Ra ).
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