Apatite u thhe dating
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Apatites are also a proposed host material for storage of nuclear waste, along with other phosphates.The standard enthalpies of formation in the crystalline state of hydroxyapatite, chlorapatite and a preliminary value for bromapatite, have been determined by reaction-solution calorimetry.
In the United States, apatite-derived fertilizers are used to supplement the nutrition of many agricultural crops by providing a valuable source of phosphate.
Trace element chemistry of the well-crystallized hydrothermal titanite from both deep and shallow ore bodies indicates coupled substitution of (Al, Fe), and the addition of elements such as Zr, Nb and REEs.
Titanite Zr-thermometry yielded a mineralization temperature of ca.
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.
We propose that the shallow- and deep-level orebodies at Luohe were deposited from the same mineralizing system and mineralization was closely related to the deep-seated diorite.
The Southeast Asian Tin Belt is a north-south elongate zone 2800 km long and 400 km wide, extending from Burma (Myanmar) and Thailand to Peninsular Malaysia and the Indonesian Tin Islands.Speculations on the existence of a possible fifth member of the calcium apatites family, iodoapatite, have been drawn from energetic considerations. The accuracy of the model at room temperature and atmospheric pressure was checked against crystal structural data, with maximum deviations of c. High-pressure simulation runs, in the range 0.5-75 kbar, were performed in order to estimate the isothermal compressibility coefficient of those compounds.The deformation of the compressed solids is always elastically anisotropic, with Br Ap exhibiting a markedly different behavior from those displayed by HOAp and Cl Ap.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).During digestion of apatite with sulfuric acid to make phosphoric acid, hydrogen fluoride is produced as a byproduct from any fluorapatite content.