1. https://data.geoscience.earth/ncl
  2. INSPIRE
  3. LithologyValue
  4. _8f082118-047c-4126-8e41-be289a9c7f09
experimental

Entry: tholeiitic basalt

URI: http://inspire.ec.europa.eu/codelist/LithologyValue/tholeiiticBasalt

Tholeiitic basalt is defined here to contain 2 pyroxene phases and interstitial quartz or tridymite or cristobalite in the groundmass. Pyroxene (augite and orthopyroxene or pigeonite) and calcium-rich plagioclase are common phenocryst minerals. Olivine may also be a phenocryst, and when present, may have rims of pigeonite. Only in tholeiitic basalt is olivine in reaction relationship with melt. Interstitial siliceous residue may be present, and is often glassy. Tholeiitic basalt is relatively poor in sodium. This category includes most basalts of the ocean floor, most large oceanic islands, and continental flood basalts such as the Columbia River Plateau.

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submitted bySophie Chaduteau
accepted on 16 Jul 2026 11:53:11.325

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date accepted 16 Jul 2026 11:53:11.325
date submitted 16 Jul 2026 09:17:50.830
definition
entity tholeiitic basalt
source graph graph

item class Concept
label tholeiitic basalt
notation 8f082118-047c-4126-8e41-be289a9c7f09
register lithology value
status status experimental
submitter
account name s.chaduteau@brgm.fr
name Sophie Chaduteau

type register item
version info 2
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Definition

broader basalt
definition Tholeiitic basalt is defined here to contain 2 pyroxene phases and interstitial quartz or tridymite or cristobalite in the groundmass. Pyroxene (augite and orthopyroxene or pigeonite) and calcium-rich plagioclase are common phenocryst minerals. Olivine may also be a phenocryst, and when present, may have rims of pigeonite. Only in tholeiitic basalt is olivine in reaction relationship with melt. Interstitial siliceous residue may be present, and is often glassy. Tholeiitic basalt is relatively poor in sodium. This category includes most basalts of the ocean floor, most large oceanic islands, and continental flood basalts such as the Columbia River Plateau.
notation tholeiiticBasalt
pref label tholeiitic basalt
type Concept

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