Apatite u thhe dating
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Fluoro-chloro apatite forms the basis of the now obsolete Halophosphor fluorescent tube phosphor system.
Variation in the negative Eu anomalies suggests the ore fluid oxygen fugacity increased from deep to shallow levels.
Fluorapatite (or fluoroapatite) is more resistant to acid attack than is hydroxyapatite; in the mid-20th century, it was discovered that communities whose water supply naturally contained fluorine had lower rates of dental caries.
Fluoridated water allows exchange in the teeth of fluoride ions for hydroxyl groups in apatite.
The Luohe Fe deposit is the largest magnetite-apatite (MA)-type deposit in the Middle-Lower Yangtze River Valley Metallogenic Belt (MLYB) (around 1 Gt Fe ore resource).
The main orebody is hosted by volcanic rocks, and widespread titanite mineralization is developed in the footwall of the shallow ore bodies, and in the hanging wall of the deep ore bodies.
Altogether 9.6 million tonnes of tin, equivalent to 54% of the world's tin production is derived from this region.
Most of the granitoids in the region can be grouped geographically into elongate provinces or belts, based on petrographic and geochronological features.- The Main Range Granitoid Province in western Peninsular Malaysia, southern Peninsular Thailand and central Thailand is almost entirely made up of biotite granite (184–230 Ma).
700 °C, suggesting that the Luohe magnetite-apatite deposit was formed at a higher temperature than typical Fe skarn deposits in the metallogenic belt.
The high ore-forming temperature may have been a key factor in Ti migration.
The linear, low-temperature portion of the diffusion data yields an activation energy of 38.5 ± 8.1 kcal/mol and a frequency factor of In (cooling rate 10°C/m.y.).
It appears that U-Th-He dating of apatite might represent a useful new thermochronometer with a range similar to that of fission-track dating of apatite.
During digestion of apatite with sulfuric acid to make phosphoric acid, hydrogen fluoride is produced as a byproduct from any fluorapatite content.