Browsing Faculty of Arts and Sciences by Keyword "chert"
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An Iron Shuttle for Deepwater Silica in Late Archean and Early Paleoproterozoic Iron Formation
(Geological Society of America, 2009)Iron formations are typically thinly bedded or laminated sedimentary rocks containing 15% or more of iron and a large proportion of silica (commonly > 40%). In the ca. 2590-2460 Ma Campbellrand-Kuruman Complex, Transvaal ... -
Secular Change in the Precambrian Silica Cycle: Insights from Chert Petrology
(Geological Society of America, 2005)Chert deposits preserve a record of secular change in the oceanic silica cycle. The evolutionary radiation of silica-secreting organisms resulted in a transition from abiological silica deposition, characteristic of the ...