Book Chapter

Glacio-marine iron formation deposition in a c. 700 Ma glaciated margin: insights from the Chuos Formation, Namibia

Maxwell A Lechte, Malcolm W Wallace, Karl-Heinz Hoffmann

GLACIATED MARGINS: THE SEDIMENTARY AND GEOPHYSICAL ARCHIVE | Geological Society Special Publication | GEOLOGICAL SOC PUBLISHING HOUSE | Published : 2019

Abstract

The Chuos Formation of Namibia is the sedimentary product of the Neoproterozoic Sturtian (c. 720-660 Ma) glaciation and contains massive diamictites intercalated with finely laminated iron formation. Similar Sturtian glacially associated iron formations are found globally. The iron formations are laminated and generally very pure. The diamictites are massive, contain abundant clasts and can be highly ferruginous. These two lithofacies are repeatedly interbedded with no facies transition. The iron formations preserve the rare earth element geochemistry of their contemporaneous seawater and contain rare Ce and Eu anomalies. The geochemistry does not implicate a hydrothermal influence. The Chuo..

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University of Melbourne Researchers