EAS201 Lecture Notes - Lecture 7: Siltstone, Diagenesis, Magnesium
20 Sep 2016
School
Department
Course
Professor
Document Summary
They hold clues regarding paleoenvironments plate tectonics ancient life. [fig. 7. 14] almost all depositional environments are important for petroleum geology source, reservoir, and cap rocks. Clastic/detrital sediments and sedimentary rocks: from sediment to rock: Graded bedding rapid deposition from turbidity current Biogenic sediments and sedimentary rocks: carbonates chert coal oil+gas [covering coal, oil+gas after midterm] Formation of most calcareous sediments: shallow marine, warm environments [skeletal material from organisms living in warm marine areas] Great barrier reef = largest living structure on earth reef crest is the rim around think of reefs as a city, you have downtown and then the suburbs around. Limestones: carbonate sediment limestone some types of shallow marine limestones: Seawater, a way of pumping seawater through the limestone. Slightly evaporate the seawater so it becomes denser/heavier so that it flows back. Mg gets stripped out in that process and calcium gets added. How to tell limestone (calcite) from dolostone (dolomite):
