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Geological Magazine; March 2002; v. 139; no. 2; p. 159-169; DOI: 10.1017/S0016756801006252
© 2002 Cambridge University Press (CUP)
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Article

Nd isotope composition of early Cambrian discrete basins

SERGEI B. FELITSYN*,* and ALEXANDER P. GUBANOV{dagger}

* Institute of Precambrian Geology and Geochronology, Russian Academy of Science, 199034 St. Petersburg, Russia
{dagger} Institute of Earth Sciences, Historical Geology and Palaeontology, Uppsala University, Norbyvägen 22, SE-75236 Uppsala, Sweden

* Author for correspondence: Felitsyn{at}ad.iggp.ras.spb.ru

A Nd isotope map of early Cambrian epeiric basins has been inferred from the Nd isotopic signature recorded in phosphatic Small Shelly Fossils. The most radiogenic {varepsilon}Nd(t) values characterize water reservoirs along the Avalonian and Cadomian belts, while {varepsilon}Nd(t) values of –10 to –20 were obtained in Laurentia and East Gondwanan Australia and China. Such a distribution of Nd isotope signatures results from the different provenance of early Cambrian epeiric seas: juvenile magmatic arcs and/or cordilleran for Mongolia, Siberia, Iberia and adjacent terranes, and cratonic sources for Laurentia and East Gondwana. Biogenic apatite of Small Shelly Fossils may be a useful tool for mapping of Nd isotope composition and documenting water mass exchange between discrete basins.




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Geological Magazine, July 1, 2005; 142(4): 419 - 439.
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