Backgrounder Radiometric Dating: Geologists have calculated the age of Earth at 4. But for humans whose life span rarely reaches more than years, how can we be so sure of that ancient date?
It turns out the answers are in Earth's rocks. Even the Greeks and Romans realized that radiogenic datings isotopes of sediment in rock signified old age. But it wasn't until the late s -- when Scottish geologist James Hutton, who observed sediments building up on the landscape, set out to show that rocks were time clocks -- that serious scientific interest in geological age began. Before then, the Bible had provided the only estimate for the age of the world: about 6, years, with Genesis as the history book.
Hutton's theories were short on evidence at first, but by most scientists concurred that Noah's ark was more allegory than reality as they documented geological layering.
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Using fossils as guides, they began to piece together a crude history of Earth, but it was an imperfect history. After all, the ever-changing Earth rarely left a complete geological record.
The age of the planet, though, was important to Charles Darwin and other evolutionary theorists: The biological evidence they were collecting showed that nature needed vastly more time than previously thought to sculpt the world. A breakthrough came with the discovery of radioactivity at the beginning of the s.
Scientists discovered that rocks could be timepieces -- literally. Many chemical elements in rock exist in a number of slightly different forms, known as isotopes.
Isotopes, Half-life (years), Effective Dating Range (years). Dating Sample, Key Fission Product. Lutetium, Hafnium, billion, early Earth. Uranium-. The other radiogenic ratios are between Sm–Nd, Rb–Sr, and K–Ar systems. The samarium-neodymium isotope system can be utilized to provide a date, isotope.
Certain isotopes are unstable and undergo a process of radioactive decay, slowly and steadily transforming, molecule by molecule, into a different isotope. This rate of decay is constant for a given isotope, and the time it takes for one-half of a particular isotope to decay is its radioactive half-life.
Stable Isotope Analysis, Radiogenic Isotope Geochemistry, Active Tectonics, Uranium series dating. In order to characterize the isotopic signature of dust from different seasons and years, in relation to their bulk particle size, and to obtain a general idea of its provenance, Saharan dust was collected using subsurface sediment traps moored in the tropical North Atlantic Ocean in –, and by shipboard aerosol collection during three transAtlantic research cruises in, and
By measuring the ratio of lead to uranium in a rock sample, its age can be determined. Using this technique, called radiometric dating, scientists are able to "see" back in time.
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