varve

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varve,

in geology, pair of thin sedimentary layers formed annually by seasonal climatic changes. Usually found in glacial lake deposits, varves consist of a coarse-grained, light-colored summer deposit and a finer-grained, dark-colored winter deposit formed when fine sediment settles out from the water under the ice cover. Varves, and the pollen they contain, are useful for interpreting recent climatic history.

varve

[′värv]
(geology)
A sedimentary bed, layer, or sequence of layers deposited in a body of still water within a year's time, and usually during a season. Also known as glacial varve.
References in periodicals archive ?
Comparing the varves with the ice cores from Greenland - they are a good record of ancient atmospheric conditions, including volcanic explosions - showed that the thicker varve layers happened in the years of heightened explosive volcanic activity.
The approximately 500 varves from both the WM and OM sites provide some limitations on the deglacial history for the region.
El ciclo es muy corto y solo se reconocen secuencias de baja energia (Sr Sl/Sm-Fm-C), no se reconocieron depositos tipo varves.
By counting the varves they are now able to travel back in time to about 52,000 years ago.
1977a, Paleoecology of Eocene lacustrine varves at Horsefly, British Columbia: Canadian Journal of Earth Sciences, v.
The team studied layers of sediments known as varves, which they said were analogous to tree rings, to give an estimated age for the Parallel Roads.
Somebody can say to you that the lake bed is made up of annual layers - I think the technical term is varves - but Adrian knows the core so well he can point to a pale layer and say 'that's the big flood of 18-whatever', and talk you through 2000 years of history.
Five centuries of interannual sediment yield and rainfall-induced erosion in the Canadian High Arctic recorded in lacustrine varves.
The thickness of varves is variable, depending on the cyclicity of sedimentation.
The varved lacustrine sediments suggest that the bulk chemical composition of the upper 2 meters is somewhat similar among sites; however, individual varves may show distinct mineralogical and compositional differences.
Measurement of geological time by applying different geochronological techniques (radioactive decay, fission traces, fossil corals, varves, etc.