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2350 Ma at 1370oC to reach a plateau equivalent to ca. 3000 Ma from 1420oC. This in accord with an event at ca. 2200 Ma seen in the SHRIMP data, where there would have been not only development of partial overgrowths but also variable loss of some radiogenic Pb from "damaged" ca. 3000 Ma zircon as well. The IDTIMS study involved analysis of multigrain unabraded aliquots and also leached grains, now know from CL images to be structural complex. The upper concordia intercept (3055 Ma) can only be considered as an "average", indicating an important component of Mesoarchean zircons. Two leaching phases yielded close to concordant dates at ca. 2390 Ma – in agreement with the more interpretable SHRIMP indications of ca. 2200 Ma. zircon growth/thermal disturbance. It is considered that in this complex rock it is fortuitous that IDTIMS, EVTIMS and SHRIMP results give essentially the same protholith ages. In the other cases in the literature where there have been comparative EVTIMS/IDTIMS – SHRIMP studies of geologically complex samples with structurally complex zircons, dates by the methods do not always agree. However, when geologically simple samples are dated by the different methods the results are generally in good agreement. — ( May 24, 2002 ) . ∗ E-mail: keisato@usp.br

C-isotope composition of early Paleoproterozoic carbonates from the Minas Supergroup and the record of The Lomagundi phenomenon in Brazil