U-Pb single zircon dating under cathodoluminescence control (CLC-method): application to polymetamorphic orthogneisses.

Poller, U., Liebetrau, Volker and Todt, W. (1997) U-Pb single zircon dating under cathodoluminescence control (CLC-method): application to polymetamorphic orthogneisses. Geochimica et Cosmochimica Acta, 139 (1-4). pp. 287-297. DOI 10.1016/S0009-2541(97)00040-5.

[img] Text
1-s2.0-S0009254197000405-main.pdf - Published Version
Restricted to Registered users only

Download (768Kb)

Supplementary data:

Abstract

The dating of polymetamorphic rocks with the U-Pb zircon method often results in discordant data. Thus a new technique combining cathodoluminescence imaging (CL) and thermal ion mass spectrometry (TIMS) measurements was developed. Cathodoluntinescence-controlled UPb dating (CLC-method) works with bisected zircons and was successfully applied to the multistage S-type granitoids of the Swiss Silvretta nappe. CLC-method enables the resolution of the different anatectic events and later major overprints (Cambrian, Ordovician, Silurian) and gives information about the protolith (Archaean) of the investigated gneisses. This is achieved by conventional UPb dating of selected grains, recovered from the SEM (scanning electron microscope) mounts after cathodoluminescence (CL) imaging.

Applying this new combination of two established techniques yields geologically meaningful UPb zircon ages even for complex polymetamorphic rocks.

Document Type: Article
Keywords: cathodoluminescence; U-Pb zircon dating; S-type granitoids; Silvretta
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/S0009-2541(97)00040-5
ISSN: 0016-7037
Date Deposited: 18 Feb 2008 17:24
Last Modified: 25 Aug 2017 07:58
URI: http://oceanrep.geomar.de/id/eprint/8069

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...