4 Questions
What process leads to the formation of nodular masses of phosphorites?
The precipitation of phosphate replacing siliceous and calcareous skeletons
Where are phosphorites known to occur?
Tropical and subtropical zones
From which geological time period are ancient phosphorite sequences known?
Precambrian
What types of rocks are included in the phosphate member?
Interbedded carbonaceous mud rock, phosphatic mud rock, pelletal, pisolitic, nodular and bioclastic phosphorite, and phosphatic dolomite and limestone
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.
Test your knowledge on the formation and characteristics of phosphorites, including the processes involved, occurrences, and historical context.
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