| 释义 |
Definition of komatiite in English: komatiitenoun kəˈmatɪʌɪt mass nounGeology A magnesium-rich extrusive rock, typically with a characteristic texture of criss-crossing olivine crystals. Example sentencesExamples - The nature and distribution of vesicles in thick komatiite flows indicates two stages of vesiculation.
- We have developed a mathematical model to evaluate the flow and erosional potential of submarine, channelized komatiite lavas at Kambalda, Western Australia.
- Alternative origins include secondary influx due to devolatization, physical incorporation, and/or thermal incorporation of sediment resulting from komatiite lava flow on hydrous sediments.
- This rhythmic layering is common within komatiite flows at Kambalda, and is inferred to reflect incremental emplacement by endogenous growth.
Derivatives adjective Geology One theory proposes that these deposits are the feeders for nickel sulphide deposits in komatiitic formations. Example sentencesExamples - The least buoyant Reliance komatiitic magmas apparently ascended first via a complex plumbing system of interconnected ‘flow-through’ sills in different regions and at different crustal levels.
- The widespread but discontinuous Reliance unit comprises a series of essentially discrete komatiitic flow fields that are submarine in most regions but partly emergent at Belingwe.
- Massive to pillowed tholeiitic basalt, komatiitic basalt and ultramafic rocks form a series of partly overlapping lensoidal bodies with typical sigmoidal outcrop patterns.
- The Reliance flow fields and associated sills are considered to represent, respectively, the volcanic and subvolcanic phases of komatiitic sill-flow complexes, each about 100 km in diameter, scattered across the craton.
Origin 1960s: from Komati (the name of a river in southern Africa) + -ite1. |