U thhe dating of phosphates apatite monazite and xenotime
Dumitru, Cenozoic thermal evolution of the central Sierra Nevada, California, from (U-Th)/He thermochronometry, Earth Planet. Stolper, Correlated He and Pb isotope variations in Hawaiian lavas, Geochim. Silver, The effects of long alpha-stopping distances on (U-Th)/He dates, Geochim. Silver, Helium diffusion and low temperature thermochronometry of apatite, Geochim. It crystallizes in the tetragonal system, forming pyramidal or prismatic crystals; it is isostructural with zircon. It has a hardness of 4–5 on the mineralogical scale and a density of 4,450-4,590 kg/ m.It occurs in granites and pegmatites in the form of granules or crystals ingrown into feldspar or quartz; it also occurs in alluvial deposits. Craig, Mantle plumes and mantle sources, Science, 258 (1992) 821.
Onstott, Noble gases in deformed xenoliths from an ocean island: characterization of a metasomatic fluid, Noble Gas Geochemistry and Cosmochemistry (ed. Farley, Rapid cycling of subducted sediments into the Samoan mantle plume, Geology, 23 (1995) 531-534. Farley, Cenozoic variations in the flux of interplanetary dust recorded by He in a deep-sea sediment, Nature, 376 (1995) 153-156. These examples are from the Cambridge English Corpus and from sources on the web.Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.