Re os isotopic dating of molybdenites ballad of gay tony internet dating

Posted by / 26-Jun-2018 05:54

Re os isotopic dating of molybdenites

This technique was also used to the Re-Os isotope geochronology of molybdenite together with the Carius tube digestion of samples (Du et al., 1998, 2001; Zhao et al., 1998), also to obtain high-precise results for both PGEs concentrations and the Os isotope compositions combing with a new sample digestion (HPA-S), a modified chemical separation method with solvent extraction and anion-exchange resins (Yang et al., 2001).Os double spikes can effectively compensate for the mass discrimination effects of ICP-MS, therefore the common correction practice for mass bias in the isotope dilution method with a single spike is unnecessary.The Re-Os isotope system, based on its unusual qualities, has been widely used on the dating and tracing in the geoscience and geochemistry.As a reflection of the international development of the Re-Os isotope geochemistry, Chinese geoscientists have also done a large quantity of work in this research field.

The spinel phase lherzolites in upper mantle may be the residual parts of the middle Proterozoic SCLM survived the delamination after formation. (2002) reported the Re-Os data for Chinese peridotite xenoliths determined in the Carnegie Institution of Washington, USA, collaborated with American scientists.Of which the Re and Os content of 8 ore samples are 2-657 ppb and 3.8-125 ppb respectively, the The application of Re-Os isotope system to the tracing and dating of sub-continental lithospheric mantle (SCLM) is another important research field of Re-Os isotope geochemistry developing in China in addition to the dating of molybdenite. (1996) first reported the osmium isotope compositions of Cenozoic basalts and their peridotite xenoliths from Anhui and Jiangsu Provinces determinated by ID-ICPMS techniques (Du et al., 1995). The osmium isotope composition of whole rock, Zhi et al.(2001b, c, 2002) reported the Re-Os isotopic systematics of more than 40 samples of peridotite xenoliths from Anhui and Jiangsu Provinces collaborated with French scientists, which were analyzed in the laboratory of CRPG/CNRS in France.The Re and Os contents of 5 samples of molybdenites are 303-822 ppm and 208-4288 ppb respectively, then the Re-Os model age is 476-521 Ma, but this age is quite different from the lithogenetic and metallogenetic ages of the deposits.In addition, also reported another molybdenite from Wunuketushan Cu-Mo ore deposits, the Re and Os contents are 50.9 ppm and 81 ppb Wu and Zou (1997) reported that the Re-Os isotope age of molybdenites from Chenmenshan Cu ore deposits, Jiangxi Province.

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Total chemical recoveries for both elements were greater than 90% and total procedural blanks were 0.07ng and 0.01ng for Re and Then N-TIMS was used to the low-level, low-blank and high-precise Re-Os isotope system of geological samples, which was first done by the researchers at the department of Earth and Space Sciences, University of Science and Technology of China in China (Sun et al., 1997a, b).