Other minerals sometimes used for uranium-lead dating include monazite, titanite and two other zirconium minerals, baddeleyite and zirconolite however.
Emerges from these and other studies is that chemical dating of monazite by emp methods offers potentially better spatial resolu-tion and lower cost. A complicating factor in monazite dating is count rate instability during the 20 min of analysis due to compositional changes induced by beam irradiation (pyle et al, 2005b jercinovic and williams, 2005 williams et al, 2006 kato, 2007 suzuki and kato, 2008 jercinovic et al, 2008. Monazite sand from brazil was first noticed in sand carried in ship's ballast by carl auer von welsbach in the 1880s von welsbach was looking for thorium for his newly invented incandescent mantles monazite sand was quickly adopted as the thorium source and became the foundation of the rare-earth industry.
After dating monazite from various migmatite rocks, we concluded that monazite, like zircon, records the complex history undergone by the host rocks (cocherie et al, 2005) several examples from the french massif central demonstrated that the cores of some monazite grains provide older (inherited) dates while the rims constrain the age of the. Present in a wide variety of rock types, monazite is a robust geochronometer capable of recording multiple crystallyzation events epma is an accurate, non destructive, high resolution dating technique.
U-pb dating of monazite and its application to geological problems' randall r parrish geological survey of canada, 601 booth street, ottawa, ont, canada kia. Dating monazite follows the u-th total pb age method which is described elsewhere in the 5690 website i will not discuss the specifics of this system but i have.
Monazite geochronology is a dating technique to study geological history using the mineral monazite it is a powerful tool in studying the complex history of metamorphic rocks particularly, as well as igneous, sedimentary and hydrothermal rocks the dating uses the radioactive processes in monazite as a clock. Monazite dating of granitic gneisses and leucogranites from the kerala khondalite belt, southern india: implications for late proterozoic crustal evolution in east gondwana.
The monazite in the matrix (and some inclusions) is interpreted as dating the prograde crystallization at (340–337) ± 7 ma within the s 1 fabric, and then being affected by recrystallization at or down to 332 ± 7 ma in the s 2 and s 3 fabrics. The radioactivity of monazite has been used as an aid in radioactive dating monazite, as already mentioned, forms in phosphatic pegmatites but is actually a standard trace constituent in many ordinary igneous, metamorphic, and vein filling rocks if not too metamict, crystals of monazite are rather durable.
Suzuki, k, and adachi, m (1991) precambrian provenance and silurian metamorphism of the tsunosawa paragneiss in the south kitakami terrane, northeast japan, revealed by the chemical th-u-total pb isochron ages of monazite, zircon and xenotime: journal of geochemistry 25, 357-376.
Monazite dating with the electon microprobe figure 1: schematic diagram showing how chemical data is collected with an electon mircoprobe monazite dating: monazite is a lanthanum-cerium light rare earth element phosphate that is common in many igneous rocks and metamorphic rocks. Electron-microprobe dating of monazite nicole malz institute of mineralogy, tu bergakademie freiberg abstract monazite (lree. Electron microprobe dating of monazite jean-marc montel , suzanne foret, mich~le veschambre, christian nicollet, ariel dating of monazite.