L03_9_Sept_Systems_Diagrams_and_Formation_Age_Earth

# Age inial mineral only parent nuclides mineral later

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Unformatted text preview: lt to the oceans? 42 The mathema;cs of the salt clock method X = salt concentra;on of oceans (let the units be kg salt per m3 water: kg/m3) Y = volume of ocean (units: m3) What is the total salt content of the oceans? Salt content = X kg/m3 * Y m3 = XY kg Z = salt concentra;on of river waters (kg/m3) A = global ﬂux of river waters to oceans (m3/year) What is the rate of delivery of salt to the oceans? Rate of delivery = Z kg/m3 * A m3/year = AZ kg/year 43 The mathema;cs of the salt clock method X = salt concentra;on of oceans (let the units be kg salt per m3 water: kg/m3) Y = volume of ocean (units: m3) What is the total salt content of the oceans? Salt content = X kg/m3 * Y m3 = XY kg Z = salt concentra;on of river waters (kg/m3) A = global ﬂux of river waters to oceans (m3/year) What is the rate of delivery of salt to the oceans? Rate of delivery = Z kg/m3 * A m3/year = AZ kg/year Age = XY kg / (AZ kg/year) = XY/AZ years 44 Es;mated age of Earth based on the ‘salt method’: About 25 million years (based on sulfate, SO4- ) About 200 million years (based on chloride, Cl- ) We now know that the Earth is 4560 million years old Where did Kelvin, Halle...
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