Sedimentary Shit Flashcards
Clastic Texture
Aggregate of grains (broken pieces of rocks and minerals) that are cemented together
Crystalline texture
aggregate of interlocking crystals that have grown together in place
Clastic Sedimentary rock
From deposition/accumulation of loose, unconsolidated mineral grains and rock fragments, then cementation and compaction of sediment during burial
Chemical Sedimentary Rock
From precipitation of minerals out of solution i.e limestone and rock salt
In general, clastic sedimentary rocks consist of 4 main components:
framework, matrix, cement, pore space
In general, clastic sedimentary rocks consist of 4 main components:
framework, matrix, cement, pore space
Framework
Consists of packed clasts that are in partial/full contact with one another
Matrix
Smaller grains that fill spaces b/w larger framework grains
Cement
Binds framework and/or matrix to form sedimentary rocks, most common types: quartz, calcite, dolomite, hematite, and clay minerals
Pore space
Non-solid space b/w grains filled with fluid
Sorting
Measure of uniformity of grain size (very poor to well-sorted)
Roundness
Degree of angularity of a grain 9smooth or rough outline)
Textural maturity
degree of sorting and roundness of framework grains (immature to supermature)
Depositional Structures
form as a result of physical processes acting on sediments during accumulation
Planar bedding
horizontal in orientation, results from settling of grains from suspension in low energy conditions or deposition of grains from rolling/bouncing/sliding along bottom under very high energy condition
