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New Kind Of Undersea Eruption Defined: 'Neptunian'

Date:
July 2, 2009
Source:
Geological Society of America
Summary:
Two Australian researchers have defined a newly recognized kind of explosive eruption, termed "neptunian," that is restricted to seafloor volcanoes.

Two Australian researchers have defined a newly recognized kind of explosive eruption, termed "neptunian," that is restricted to seafloor volcanoes.

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Sharon R. Allen and Jocelyn McPhie, of the School of Earth Sciences and Centre of Excellence in Ore Deposits, at the University of Tasmania in Hobart, Tasmania, describe their work in a new article published in the journal Geology.

These eruptions are sustained and driven by gas exsolved from magma. The explosions inject large volumes of hot pumice clasts into the seawater above the vent. The hot pumice clasts rapidly absorb water and sink, forming density currents that flow across the seafloor.

Vast areas of the modern seafloor are covered by these pumice-rich neptunian deposits. Neptunian eruptions differ dramatically from magmatic-gas-driven explosive eruptions on land, reflecting the important influence of confining pressure and the higher heat capacity, density, and viscosity of water compared to air.


Story Source:

The above story is based on materials provided by Geological Society of America. Note: Materials may be edited for content and length.


Journal Reference:

  1. Sharon R. Allen and Jocelyn McPhie. Products of neptunian eruptions. Geology, 2009; DOI: 10.1130/G30007A.1

Cite This Page:

Geological Society of America. "New Kind Of Undersea Eruption Defined: 'Neptunian'." ScienceDaily. ScienceDaily, 2 July 2009. <www.sciencedaily.com/releases/2009/06/090630204755.htm>.
Geological Society of America. (2009, July 2). New Kind Of Undersea Eruption Defined: 'Neptunian'. ScienceDaily. Retrieved October 25, 2014 from www.sciencedaily.com/releases/2009/06/090630204755.htm
Geological Society of America. "New Kind Of Undersea Eruption Defined: 'Neptunian'." ScienceDaily. www.sciencedaily.com/releases/2009/06/090630204755.htm (accessed October 25, 2014).

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