SACRAMENTO STATE Geology 103 Sedimentology and Stratigraphy Tim Horner Geology Department, CSU Sacramento Lecture #11: Chert and Ironstone Reading assignment:

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SACRAMENTO STATE Geology 103 Sedimentology and Stratigraphy Tim Horner Geology Department, CSU Sacramento Lecture #11: Chert and Ironstone Reading assignment: Boggs, 5th ed., pp. 175-194

Microquartz, megaquartz, chalcedony- thin sections From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., p. 207

Opal- amorphous, irridescent

Jasper, flint, porcelanite

Bedded chert, nodular chert

Diatoms in deep sea sediment From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., p. 209

Nodular chert From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., p. 210

Sources of silica in marine water From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., p. 222

Pathways of silica transformation after deposition From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., p. 214

Silica stability vs. pH and temp. From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., p. 214

Principal iron-bearing minerals From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., p. 219

Banded iron formation (BIF)

Geochemical stability of iron-rich minerals From Boggs, Principles of Sedimentology and Stratigraphy, 5th ed., p. 222