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Questions and Answers
What process leads to the formation of nodular masses of phosphorites?
What process leads to the formation of nodular masses of phosphorites?
- The precipitation of phosphate replacing siliceous and calcareous skeletons (correct)
- The breakdown of sedimentary organic matter
- The reworking leaving a concentrate of nodules, pellets, and coprolites
- The occurrence in tropical and subtropical zones
Where are phosphorites known to occur?
Where are phosphorites known to occur?
- Temperate zones with high organic productivity
- Tropical and subtropical zones (correct)
- Deep ocean trenches
- Polar regions with upwelling currents
From which geological time period are ancient phosphorite sequences known?
From which geological time period are ancient phosphorite sequences known?
- Precambrian (correct)
- Cretaceous
- Jurassic
- Paleogene
What types of rocks are included in the phosphate member?
What types of rocks are included in the phosphate member?
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Study Notes
Phosphorite Formation
- Upwelling of nutrient-rich waters and high productivity of phytoplankton lead to the formation of nodular masses of phosphorites.
Phosphorite Occurrence
- Phosphorites are known to occur in sedimentary basins, often associated with coastal upwelling zones and continental shelves.
Geological Time Period
- Ancient phosphorite sequences are known from the Proterozoic and Phanerozoic eons, spanning over 1.8 billion years.
Phosphate Member Composition
- The phosphate member includes a variety of rocks, such as phosphorite, sandstone, siltstone, limestone, and shale.
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Test your knowledge on the formation and characteristics of phosphorites, including the processes involved, occurrences, and historical context.
