“Basalt fan structure”的意思、由来-开放百科全书

词条

Basalt fan structure

释义

References

{{short description|Rock formation composed of columnar jointed basalt columns that have slumped into a fan shape}}{{refimprove|date=February 2014}}

A basalt fan structure is a basalt formation composed of columnar jointed basalt columns that have slumped into a fan shape.^[1]{{verification failed|date=November 2018}}

They are most likely created when basalt lava is intruded into a soft material, such as loose volcanic ash, which is unable to support the intrusion. As the basalt cools and forms columns, the ash collapses, causing the lava spread and form a fan shape. The formations can be vertical or any degree of horizontal.{{cn|reason= does not seem structurally plausible|date=November 2018}}

References

1. ^{{cite web | url=http://pubs.usgs.gov/pp/0864b/report.pdf | title=Joint Systems in the Watchung Basalt Flows, New Jersey | publisher=United States Government Printing Office | work=Geological Survey Professional Paper 864-B | accessdate=13 February 2014 | author=Faust, George T.}}

1 : Columnar basalts

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