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An in-depth exploration of siliceous sedimentary rocks, including chert and silica geochemistry, as well as phosphorites and evaporites. Topics cover the origin and transformation of these rock types, their geochemical properties, and the conditions necessary for their formation. The document also discusses the economic importance of phosphorites and the role of upwelling zones in the formation of these sedimentary rocks.
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Fine-grained, dense , hard rocks composed predominantly of SiO 2 minerals quartz, chalcedony , and opal + minor impurities
Amorphous SiO 2 - highly soluble
Biogenic Opal to Chert Transformation
Cretaceous Cherts
Cretaceous Hawasina Group, Oman
A: radiolarite. B.spiculite, C. lutecite, D. chalcedony (fiberous microquartz replacement)
15% P 2 O 5 , or 6.5%P - Average sediments <0.5%
Deep Sea Core - Pore water chemistry (interstitial water)
Evaporation Sequence
2 km thick!?