Age of FS66 Kimberlite Beneath Murray Basin, South Australia: Laser Ablation ICP-MS Dating of Kimberlitic Zircon, Perovskite,

Grains of zircon, perovskite and rutile (0.3-1.0mm in size) have been recovered from a deeply buried kimberlite in South Australia. U-Pb ages of these grains have been determined using in situ LAM-ICPMS techniques at GEMOC, Macquarie University, Sydney. The kimberlitic pipe, designated FS66, is located 10.6 kilometres NNW of the town of Blanchetown along the Murray River, beneath 214 metres of Tertiary Murray Basin sediments. Another similar intrusion, designated FS3, is located nearby (Fig. 1). While described as breccia kimberlite (Lewis, 1985), the recovery of sample was limited to only very fine drill chips, with most minerals replaced by secondary carbonate and clays