Geology 103 (Sedimentology and Stratigraphy)
California State University, Sacramento
Evaporites and Chert, ironstone, phosphatic rocks and glauconite
Upon completion of this unit students should be able to:
- Identify common evaporite minerals and their sequence of precipitation
- Discuss the geochemistry of evaporite deposits
- Relate hypersaline lake environments to evaporite deposits
- Describe different modes of formation for nodular chert and bedded chert.
- Discuss the crystalline or textural forms of chert
- Identify the geochemical or biological conditions that favor the formation of chert
- Discuss the evidence that ironstones provide for an early atmosphere.
- Classify or name ironstones and chert.
- Distinguish between banded iron formations and ironstones
- Describe the geochemical conditions that favor different forms of iron
- Discuss the relationship between ocean upwelling and phosphate deposition.
- Discuss the formation and occurrence of the mineral glauconite
Lecture 18: Evaporite deposits- Boggs, 5th edition, pp. 168-174
Lecture 19: Chert, ironstone, phosphatic rocks, glauconite- Boggs, 5th edition, pp. 175-194
Pleasefill out a reading log for this week. Reading logs are extra credit this week, and are due at the start of class on Wednesday.
Graphics from lectures:
Lab this week-
Petrology of evaporites, coal, phosphatic rocks, glauconite and ironstones:
I will pass out a copy of the lab. If you need another copy you can click here:
Due date: start of lab, next week.
Weekend field trip: Coastal processes, sedimentary environments
(Friday April 26th through Sunday April 28th)
We will have two lectures on our weekend field trip. Click here for field trip notes and graphics:
Beach and barrier island deposits:
Field trip handout:
Coastal field trip handout