J. Wooden

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An Archean Wilson Cycle Recorded by Slow-growth Zircon in the Kapuskasing Uplift, Ontario, Canada

AGUFM (2006)

D. E. Moser John R. Bowman J. Wooden John W. Valley F. K. Mazdab

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Probable provenance of Precambrian zircons extracted from an Ordovician sandstone from the Suwannee Basin

Geological Society of America, Abstracts with Programs; (United States) (1993)

Paul A. Mueller Ann L. Heatherington Allen P. Nutman Ian Williams J. Wooden

Zircons separated from a core extracted from an Ordovician sandstone beneath Alachua County, Florida, were analyzed for U, Th, and Pb elemental and isotopic composition using the SHRIMP II ion microprobe. Forty separate grains were analyzed and ranged in age from [approximately]2.7 to 0.5 Ga. Fifty percent of the grains yielded ages of 0.52 to 0.64 Ga. In general, these ages correspond to the Pan-African (Africa) or Brasiliano (South America) orogenic cycles. The second largest group ([approximately]30%) yielded ages in the range 2.06 to 2.46 Ga, which generally corresponds to the Birimian (Africa) and trans-Amazonian (South America) orogenic cycles. Lesser populations yielded ages that were Middle Proterozoic ([approximately]1.7 Ga, 5%), Archean ([approximately]2.7 Ga, 5%), or too discordant for reliable interpretation ([approximately]10%). The zircons all have U and Th abundances indicative of a magmatic rather than metamorphic origin. The average age for all zircons is 1.33 Ga, comparable to the whole-rock Sm-Nd depleted mantle model age of 1.25 Ga. These data clearly indicate that the Suwannee Basin was receiving detritus from a long-lived Precambrian shield area that contained significant quantities of both Neoproterozoic and Early proterozoic magmatic rocks. Co-occurrences of 2.0--2.4 Ga and 0.5--0.65 Ga rocks are non existant in Laurentia.more » Among the Gondwanan continents, prominent occurrences are limited to western Africa and northeastern South America. It seems likely, therefore, that the pre-Paleozoic rocks of the Florida peninsula evolved in close proximity to these cratonic areas which were joined prior to the breakup of Gondwanaland. Peri-Gondwanan'' arcs and Antarctic derivations of the peninsula are improbable.« less

Laurentia

Detritus

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An Evaluation of Uncertainties in the Ti-in-Quartz and Ti-in-Zircon Paleothermometers in a Well Characterised Rhyolitic Eruption Deposit

AGUFM (2009)

B. L. A. Charlier Colin Wilson J. Wooden D. J. Morgan

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