31. They have isotope ratios that are said to be consistent with each other and inconsistent with the Earth. 32. The provenance of ocean sediments can be determined by analysing terrigenous strontium isotope ratios in deep ocean cores. 33. Bowen said the study analyzed carbon isotope ratios of soils found in sediments that contained the ancient fossils. 34. Finally, ages can also be determined from the U Pb system by analysis of Pb isotope ratios alone. 35. Likewise, most water comes from the magma rather than from precipitation, as indicated by the oxygen isotope ratios . 36. The isotope ratios of xenon are an important tool for studying the early history of the Solar System. 37. When these isotope ratios are measured by TIMS, mass-dependent fractionation occurs as species are emitted by the hot filament. 38. If so, the data about oxygen isotope ratios would be incomplete, especially for times when the extremities were coolest. 39. The isotope ratios for strontium and lead vary depending on the types of rock and soil in an area. 40. The raw material used has a higher oxygen isotope ratio than all other sources of white nephrite in East Asia.
