Lens (geology): Difference between revisions
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{{Short description|Body of ore or rock that is thick in the middle and thin at the edges}} |
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[[File:Chalk_with_cover_of_Caliche_Naari_and_Chert_lens_a_road_38.jpg | thumb | 220x124px | right | alt= Exposed white chalk next to a road. | Lens shown next to a road.]] |
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In [[geology]], a '''lens''' or '''lentil''' is a body of [[ore]] or [[Rock (geology)|rock]] that is thick in the middle and thin at the edges, resembling a [[convex lens]] in cross-section.<ref>{{cite book|last1=Bates|first1=Robert L.|last2=Jackson|first2=Julia A.|title=Dictionary of Geological Terms|location=New York|publisher=Anchor Press|date=1984|isbn=978-0385181013|url=https://books.google.com/books?id=m4iFpN2SpkEC|page=293}}</ref> |
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To thin out in all directions is to "lens out", also known as "lensing". The adjectives "lenticular" and "lentiform" are used to describe lens-like formations. '''Lenticle''' is a synonym for lentil, but may also refer to a fragment of rock that is lens-shaped. "Lenticule" is used for small lentil.<ref name=neu>{{cite book|last1=Neuendorf|first1=Klaus K. E.|last2=Jackson|first2=Julia A.|title=Glossary of Geology|location=Alexandria, Va.|publisher=American Geological Institute|date=2005|isbn=978-0922152766|url=https://books.google.com/books?id=yD79FqfECCYC|page=368}}</ref> |
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A lens can also refer to an irregular shaped formation consisting of a [[porous]], [[permeable]] [[sedimentary]] deposit surrounded by impermeable rock. |
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A lentil may also refer a minor unit in a formation of rock, similar to a [[Stratigraphic unit#Member|member]] but not generally spread out over a large geographical area. In this usage, the lentil thins out towards its edges.<ref>{{cite book|last1=Koeberl|first1=Christian|last2=Martinez-Ruiz|first2=Francisca|title=Impact Markers in the Stratigraphic Record|location=Berlin|publisher=Springer Berlin|date=2013|isbn=978-3642624575|url=https://books.google.com/books?id=7WgrBgAAQBAJ|page=45}}</ref> |
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[[Lenticular bedding]] is a special form of rock [[Interbedding|interbedded]] [[mudrock]] and [[Lamination (geology)|cross-laminated]] [[Ripple mark|rippled]] [[sandstone]]. The lenses or ripples in lenticular beds are discontinuous in all directions.<ref name=neu /> |
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==See also== |
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*{{annotated link|Flaser bed}} |
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==References== |
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{{reflist}} |
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{{DEFAULTSORT:Lens (Geology)}} |
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[[Category:Petrology]] |
[[Category:Petrology]] |
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[[Category:Sedimentology]] |
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Latest revision as of 12:59, 3 June 2024
In geology, a lens or lentil is a body of ore or rock that is thick in the middle and thin at the edges, resembling a convex lens in cross-section.[1]
To thin out in all directions is to "lens out", also known as "lensing". The adjectives "lenticular" and "lentiform" are used to describe lens-like formations. Lenticle is a synonym for lentil, but may also refer to a fragment of rock that is lens-shaped. "Lenticule" is used for small lentil.[2]
A lentil may also refer a minor unit in a formation of rock, similar to a member but not generally spread out over a large geographical area. In this usage, the lentil thins out towards its edges.[3]
Lenticular bedding is a special form of rock interbedded mudrock and cross-laminated rippled sandstone. The lenses or ripples in lenticular beds are discontinuous in all directions.[2]
See also
[edit]- Flaser bed – Sedimentary bedding pattern
References
[edit]- ^ Bates, Robert L.; Jackson, Julia A. (1984). Dictionary of Geological Terms. New York: Anchor Press. p. 293. ISBN 978-0385181013.
- ^ a b Neuendorf, Klaus K. E.; Jackson, Julia A. (2005). Glossary of Geology. Alexandria, Va.: American Geological Institute. p. 368. ISBN 978-0922152766.
- ^ Koeberl, Christian; Martinez-Ruiz, Francisca (2013). Impact Markers in the Stratigraphic Record. Berlin: Springer Berlin. p. 45. ISBN 978-3642624575.
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