Pb, U, Tl, Hf and Zr distributions in zircons determined by proton microprobe and fission track techniques

Details Pb, U, Tl, Hf and Zr distributions in zircons determined by proton microprobe and fission track techniques Pb, U, Tl, Hf and Zr distributions in zircons determined by proton microprobe and fission track techniques

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43..905c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 43, Issue 6, pp.905-918

Other

3

Scientific paper

A proton microprobe has been used to determine Pb, Tl, Hf and Zr distributions across four single zircon crystals separated from a `rapakivi' granite. The Pb and Zr data are quantitative: Pb and Tl concentrations were below the measurable limits for determinations in situ by most other techniques. The distribution of U in the same crystals was determined by the fission track technique. Limits on precision of U allow only a qualitative correlation of U and Pb, whereas the Tl and Pb correlation is more exactly determined. Zircons with distinct cores and overgrowths exhibited uniform Zr and Hf concentrations across the crystals, whereas the high U rims and `inclusions' (domains) also had high Tl and Pb contents. Since almost all the Pb in these zircons is derived by radioactive decay of U, the Tl substitution has paralleled that of U. The results indicate that the high U domains are `hot spots' rather than a separate mineral phase. The strong positive correlation of U and Pb indicates that there is little U daughter product migration relative to U, within the crystal. However, for the zircon population investigated here, the data are equivocal on the question of whether U addition to zircon crystals is associated with new zircon growth or not. In either case, the heterogeneous U and Pb distributions complicate any interpretations of U-Pb isotopic analysis for such zircon populations.

Affiliated with

Also associated with

No associations

Rating

Pb, U, Tl, Hf and Zr distributions in zircons determined by proton microprobe and fission track techniques does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Pb, U, Tl, Hf and Zr distributions in zircons determined by proton microprobe and fission track techniques, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pb, U, Tl, Hf and Zr distributions in zircons determined by proton microprobe and fission track techniques will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1777102