such as homogeneity particle size index.
Especially for sandstone and limestone.
And how they can be calculated (With math calculations).
sajad
grain size , arrangement and cementation and matrix, diagnises , fossils.
Dear,
Hope the follow links will be helpful
https://www.earth.ox.ac.uk/~oesis/micro/
https://www.rilem.net/global/gene/link.php?doc_id=4973&fg=1
petrographic index of sedimentary rocks include field notes in the outcrop and also macroscopic description of the hand specimens.
Dear Sajad,
sorting describes a distribution of particle size in sedimetns, so homogeneity of particles (grains) size in clastic rocks can be expressed using sorting index e.g. Folk and Ward 1957
Texture, cementation, matrix and in the case of limestone, including fossils.
The petrographic examination of a clastic rock reveals the abundance of its detrital-sized components such as quartz, feldspar and lithic constituents. This is very useful in distinguishing sediments sourced from different tectonic terranes. Recently geochemical analysis of clastic rocks has become a popular tool to determine the abundances of the components of the clastic rocks such as the major detrital phases, matrix, heavy minerals and diagenetic or metamorphic minerals. The petrography and geochemical methods have become complementary techniques which are valuable in understanding the source, provenance and tectonic evolution of areas underlain by these stratigraphic units.
The physicomechanical properties of rocks are the most important parameters.
Check this: RELATIONSHIPS BETWEEN PETROGRAPHIC AND PHYSICOMECHANICAL PROPERTIES OF BASIC IGNEOUS ROCKS FROM THE PINDOS OPHIOLITIC COMPLEX, NWGREECE Pomonis P.t, Rigopoulos 1.1, Tsikouras B. 1, and Hatzipanagiotou K. 1
I am hearing the term for the first time though there are terms like mineralogical index, maturity index, textural index etc for sedimentary rock are commonly used.
There are certain criteria like frame work constituents ...clast content/ composition/ cement/ matrix which give petrographic details
based on grains and their size you can again determine the sphericity, roundness, sorting kurtosis, skewness like parameters.
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