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Biogeochemistry of Late Paleozoic North American brachiopods and secular variation of seawater composition by Uwe Brand is a Environmental Science article available to read on EtoBox.

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Sr/Ca ratios in modern brachiopod shells reflect variations in ambient seawater, whereas their Na contents show no relationship with water depth or habitat. Their Mn and Fe contents are controlled, in part, by leaching of these elements from oxide coatings or the low input/sedimentation rate of detrital material into depositional areas such as Quatsino Sound. For most Carboniferous brachiopods from North America, the Mn and Fe contents are similar to those recorded by their Recent counterparts. The high Mn and Fe contents in the brachiopods from shales suggest several possibilities for these levels. One possibility is the leaching of Mn and Fe from oxide coatings/matrix which was not completely removed in the cleaning process, or the high levels in part reflect unusual depositional conditions (some degree of anoxia) for the local shaly environments. The Sr/Ca ratio of brachiopods and, by inference, complementary seawater, did not vary significantly during the Carboniferous. The Sr/Ca minimum observed in brachiopods of Mississippian age coincides with a dip in the 8 7Sr/ 8 6Sr curve and correlates with the Hercynian orogeny. This is attributed to the cycling of seawater through mid-

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Author

Uwe Brand

Publisher

Springer Netherlands; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 0923-9820)

Published

1989

Language

EN

Field

Environmental Science (Physical Sciences)