deep lead . A lead [eco geol] or alluvial placer that is buried under soil or rock. Pron: deep leed.
GeoWord of the Day
The GeoWord of the Day is a free service of the American Geosciences Institute. All of the terms and definitions are from the Glossary of Geology, 5th Edition Revised.
evapotranspiration (e-vap''-o-tran''-spi-ra'-tion). Loss of water from a land area through transpiration of plants and evaporation from the soil and surface-water bodies. Also, the volume of water lost through evapotranspiration.
seismic map . A contour map constructed from seismic data. Values may be in either time or depth; data may be plotted with respect to the observing station (producing an "unmigrated map") or with respect to the subsurface reflecting or refracting point locations (a "migrated map"). Maps displaying seismic data themselves may also be made from 3-D volumes of data showing the distribution of amplitude along a picked horizon; this is called a horizon slice or amplitude map. Attributes may also be calculated from seismic data and displayed in map format. See also: time slice.
lagoon [coast] (la-goon'). (a) Typically, a narrow water body that is parallel to the shore and is between the mainland and a barrier and parallel to the shore. Little or no fresh water in flux and limited tidal flux cause elevated salinities (Davis, 1983). (b) A shallow freshwater pond or lake near or communicating with a larger lake or a river; a stretch of freshwater cut off from a lake by a barrier, as in a depression behind a shore dune; a barrier lake. (c) A shallow body of water enclosed or nearly enclosed within an atoll. (d) The term has been widely applied to other coastal features, such as an estuary, a slough, a bayou, a marsh, and a shallow pond or lake into which the sea flows. Etymol: Latin lacuna, "pit, pool, pond". Syn: lagune; laguna [coast].
owensite . A metallic cubic mineral: (Ba,Pb)6(Cu1+,Fe,Ni)25S27.
dikelet (dike'-let). A small dike. There is no agreement on specific size distinctions.
strunzite (strunz'-ite). (a) A yellow to brownish-yellow fibrous triclinic mineral: Mn2+Fe3+2(PO4)2(OH)2•6(H2O,OH) . (b) A group name for minerals with the analogous composition, but with Mn2+ replaced by Fe2+ or Fe3+.
rhizomorph (rhi'-zo-morph). A term used by Northrop (1890) for a structure now known as a rhizoconcretion.
analcimite (a-nal'-ci-mite). In the IUGS classification, a volcanic rock with F/(F+A+P)>90%, and in which the most abundant feldspathoid is analcime. An extrusive or hypabyssal igneous rock consisting mainly of analcime and pyroxene (usually titanian augite). Feldspathoids, plagioclase, and/or olivine may be present. Apatite, titanite, and opaque oxides may be present as accessories.
heteroblastic (het''-er-o-blas'-tic). Pertaining to a type of crystalloblastic texture in a metamorphic rock in which the essential mineral constituents are of two or more distinct sizes. The term was originated by Becke (1903). Cf: homeoblastic.
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