Extended
crust |
Oceanic crust: 0–20
Ma 20–65
Ma >65
Ma |
This article includes a list of general
references, but it lacks sufficient corresponding
inline citations. (May 2014) |
A geologic province is a spatial entity with common geologic attributes. [1] A province may include a single dominant structural element such as a basin or a fold belt, or a number of contiguous related elements. Adjoining provinces may be similar in structure but be considered separate due to differing histories.
Province | Definition | Subcategories | Examples |
---|---|---|---|
Shield | Exposed Precambrian crystalline igneous and metamorphic rocks that form tectonically stable areas | ||
Platform | Horizontal or gently-lying sedimentary strata covering a basement of igneous or metamorphic rocks | ||
Orogen | Linear or arc-shaped formation where continental crust has been folded, deformed and uplifted to form mountain ranges | ||
Basin | Low-lying formation of rock strata formed by tectonic warping of previously horizontal strata | ||
Large igneous province | Accumulation of igneous rocks, including liquid rock (intrusive) or volcanic rock formations (extrusive) | ||
Extended crust | Continental crust thinned due to extensional strain |
Some studies classify provinces based upon mineral resources, such as mineral deposits. There are a particularly large number of provinces identified worldwide for petroleum and other mineral fuels, such as the Niger Delta petroleum province.