“Horizon (geology)”的意思、由来-开放百科全书

In geology, a horizon refers to either a bedding surface where there is marked change in the lithology within a sequence of sedimentary or volcanic rocks, or a distinctive layer or thin bed with a characteristic lithology or fossil content within a sequence.^[1] In the interpretation of seismic reflection data, horizons are the reflectors (or seismic events) picked on individual profiles. These reflectors represent a change in rock properties across a boundary between two layers of rock, particularly seismic velocity and density.^[2]

Marker horizon

Marker horizons are stratigraphic units of distinctive lithology (different from the bulk of the sequence) with a wide geographical extent that are used in stratigraphic correlation. Layers of tuff (lithified volcanic ash) are often used for this purpose.

Event horizon

An event horizon is a bed that marks a geological event, such as an earthquake or a meteorite impact. It is the basic unit used in event stratigraphy.^[3]

References

1. ^{{cite book|last=Rey|first=J.|title=Stratigraphy: Terminology and Practice|editor=Rey J. & Galeotti S.|publisher=Editions OPHRYS|year=2008|page=10|chapter=Stratigraphy: Foundations and Perspectives |isbn=9782710809104 |url=https://books.google.com/books?id=3hM2CkCYJbgC&pg=PA4&dq=marker+horizon+stratigraphy&hl=en&sa=X&ei=jwoHUYSeJuuS0QWslYCIDw&ved=0CEwQ6AEwBjgo#v=onepage&q=marker%20horizon%20stratigraphy&f=false|accessdate=28 January 2013}}
2. ^{{cite web|url=http://www.glossary.oilfield.slb.com/en/Terms/h/horizon.aspx|title=horizon|last=Schlumberger Limited|date=2013|work=Oilfield Glossary|accessdate=30 January 2013}}
3. ^{{cite web|url=http://homepage.smc.edu/grippo_alessandro/gss6.html |title=Event stratigraphy |last=Grippo |first=A. |date=9 May 2011 |accessdate=28 January 2013 |deadurl=yes |archiveurl=https://web.archive.org/web/20150613191841/http://homepage.smc.edu/grippo_alessandro/gss6.html |archivedate=13 June 2015 |df= }}