PB-PB ZIRCON EVAPORATION DATE FOR THE CHARLESTON GRANITE, SOUTH AUSTRALIA - COMPARISONS WITH OTHER ZIRCON GEOCHRONOLOGY TECHNIQUES

In order to draw attention to the effectiveness of the single-grain ev aporation technique of Pb-Pb zircon dating, this method has been appli ed to the Charleston Granite, a Mesoproterozoic granitoid from the Sou th Australian Gawler Craton The granite has previously been dated by b oth conventional and SHRIMP U-Pb techniques permitting comparison of t he relative advantages of all three techniques. The date obtained by t he evaporation technique for the crystallisation of the main magmatic phase of zircon was 1581 +/- 4 Ma (2 sigma) which is the same within e rror as the SHRIMP result of 1585 +/- 5 Ma (2 sigma).