The uranium content of rocks is more variable than was thought, say geologists.The finding should lead to more accurate dating of geological events.
- www happyseniordating com
- blogger recent comments not updating
- sp4rks dating
- speed dating herbert film
- Adult dating portal software couples
Confined as they are in these crystals, many scientists believe that the ratio of parent radioactive uranium to daughter lead atoms in zircons can be used to calculate the ages of the crystals.
Radioisotopic dating is a key tool for studying the timing of both Earth's and life's history.
Un paragneiss charnockitique de la se´rie de l' In Ouzzal (Ahaggar, Alge´rie) ae´te´e´tudie´par la technique U, Th, Pb sur zircons.
Lese´chantillons de 1 mg donnent une discordia U-Pb dont l'intercept supe´rieur avec la concordia est de 2.17 B. Unee´tude de ces zircons cristal par cristal a permis de distinguer deux populations: des zircons jaunes, euhe´draux donnant unaˆge de 2.04 B.
The technique, however, has always been based on the assumption that the ratio of U was a constant 137.88 to 1 in all rocks.