دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: igneous or metamorphic rock, which seldom contains petroleum. Ordinarily, it lies below sedimentary rock. When it is encountered in drilling, the well is usually abandoned.

n: metamorphic rock that has a layered look not necessarily associated with the original layering in sedimentary rock.

a coarse, metamorphic rock with some parallel alignment of granular minerals and alternate bands of flaky or elongate minerals.

a metamorphic rock composed largely of calcite.

n: a rock derived from preexisting rocks by mineralogical, chemical, and structural alterations caused by heat and pressure within the earths crust. Marble is a metamorphic rock.

n: a buried landscape in which sediments were deposited on an eroded surface of igneous or metamorphic rock. Compare unconformity.

an unconformity that separates profoundly different rock types, such as sedimentary rocks from metamorphic.

n: metamorphic rock that appears massive and homogeneous, i.e., without the layered look of foliated metamorphics.

n: a branch of geology dealing with the origin, occurrence, structure, and history of rocks, principally igneous and metamorphic rocks. Compare lithology.

n: a coarse-grained, foliated metamorphic rock that splits easily into layers. It is formed when shale under deep burial becomes slate and then, with more intense metamorphism, becomes schist.

a crystalline metamorphic rock that can be split into think layers because of the bedded mineral arrangements.