Re os isotopic dating of molybdenites

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(1997) reported that the Re-Os isotope age of molybdenite from Duobaoshan and Tongshan porphyry Cu-Mo ore deposits.

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.

The Re-Os isochron plots the ratio of radiogenic Rhenium and Osmium were strongly refractory and siderophile during the initial accretion of the Earth which caused both elements to preferentially enter the Earth's core.

Thus the two elements should be depleted in the silicate Earth yet the The reason for this apparent contradiction is owed to the change in behavior between Re and Os in partial melt events.

All rhenium and osmium isotopic measurements were made on a VG plasma Quad facility.

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).

Re tends to enter the melt phase (incompatible) while Os remains in the solid residue (compatible).

Infiltration of xenoliths by their commonly Re-rich magma alters the true elemental Re/Os ratios.Rhenium-Osmium dating is carried out by the isochron dating method.

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