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Prospecting in the Nepal Himalaya has brought to light Fe-formations that are probably Paleozoic, and a search of the literature has revealed others. The generalization that all Fe-formations are Proterozoic or Archeozoic, which is a basic assumption in many theories, is very probably not valid, therefore. A class of Fe ores intermediate in lithology and age between the banded Fe-formations and the Clinton ores is described. A factor that may explain the distinctive features of banded Fe-formations while accounting for the absence of these features in the Clinton ores is discussed. The suggestion is made that sedimentary Fe ores show a progressive change in lithology with tectonic evolution.
This record provided courtesy of AGI/GeoRef.
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  V. A. Melezhik, V. A. MELEZHIK, I. M. GOROKHOV, A. E. FALLICK, D. ROBERTS, A. B. KUZNETSOV, K. B. ZWAAN, and B. G. POKROVSKY Isotopic stratigraphy suggests Neoproterozoic ages and Laurentian ancestry for high-grade marbles from the North-Central Norwegian Caledonides Geological Magazine, July 1, 2002; 139(4): 375 - 393. [Abstract] [Full Text] [PDF]
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