petrologypɪˈtrɒl ə dʒi
petrology
English Definitions:
petrology, lithology (noun)
the branch of geology that studies rocks: their origin and formation and mineral composition and classification
petrology (Noun)
the study of the origin, composition and structure of rock
Petrology
Petrology is the branch of geology that studies the origin, composition, distribution and structure of rocks. Lithology was once approximately synonymous with petrography; but in current usage, lithology focuses on macroscopic hand-sample or outcrop-scale description of rocks, while petrography is the speciality that deals with microscopic details. In the oil industry, lithology, or more specifically mud logging, is the graphic representation of geological formations being drilled through, and drawn on a log called a mud log. As the cuttings are circulated out of the borehole they are sampled, examined and tested chemically when needed.
Petrology
Petrology (from Ancient Greek πέτρος (pétros) 'rock', and -λογία (-logía) 'study of') is the branch of geology that studies rocks and the conditions under which they form. Petrology has three subdivisions: igneous, metamorphic, and sedimentary petrology. Igneous and metamorphic petrology are commonly taught together because they both contain heavy use of chemistry, chemical methods, and phase diagrams. Sedimentary petrology is, on the other hand, commonly taught together with stratigraphy because it deals with the processes that form sedimentary rock.
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