Mantle potential temperature estimates of basalt from the surface of Venus

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The crater density and distribution of Venus indicates the average surface age is younger (≤1 Ga) than most terrestrial planets and satellites in the Solar System. The type and rate (i.e. equilibrium, catastrophic or differential) of volcanism associated with the stagnant lid tectonic system of Venus is a first order problem that has yet to be resolved but is directly related to the thermal conditions of the mantle. The calculated primary melt composition of basalt at the Venera 14 landing site is high-Mg basalt to picrite with a mantle potential temperature estimate similar to terrestrial ambient mantle (1370 ± 70 °C). The calculated accumulated fractional melting curves indicate the olivine compositions from the melt have Mg# of 89-91. The results show that the thermal regime required to generate the primary melt composition of the Venera 14 basalt was not anomalously high (i.e. mantle-plume system) but rather consistent with a lithospheric tensional rift system. The juxtaposition of high thermal regime structures (e.g. Beta Regio) and 'ambient' mantle potential temperature estimates of the Venera 14 basalt suggests that the relatively young surface of Venus is the result of volcanism from a combination of thermal systems that resurfaced the planet at variable rates.

Original languageEnglish
Pages (from-to)98-102
Number of pages5
JournalIcarus
Volume277
DOIs
Publication statusPublished - 2016 Oct 1

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Venus (planet)
potential temperature
Venus
basalt
Earth mantle
mantle
thermal regime
melt
estimates
volcanism
planet
picrite
temperature
mantle plume
landing sites
terrestrial planets
solar system
crater
olivine
craters

Keywords

  • Geological processes
  • Tectonics
  • Terrestrial planets
  • Venus
  • Volcanism

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Mantle potential temperature estimates of basalt from the surface of Venus. /  Shellnutt, J.g.

In: Icarus, Vol. 277, 01.10.2016, p. 98-102.

Research output: Contribution to journalArticle

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