| 释义 |
Definition of diatreme in English: diatremenounˈdʌɪətriːmˈdīəˌtrēm Geology A long vertical pipe or plug formed when gas-filled magma forced its way up through overlying strata. Example sentencesExamples - Various architectures connecting extrusive mud volcanic cones to their underlying source layer have been described, ranging from bulbous diapirs to steep diatremes and narrow vertical pipes.
- Lower crustal garnet granulite xenoliths from beneath the Kola-Karelian domain of the Fennoscandian Shield were brought to the surface in Devonian lamprophyre diatremes.
- The only known igneous rocks in the area are Permian periodotite and lamprophyre dikes as well as diatremes of ultramafic composition associated with the Fluorite district.
- To date, the only described mantle xenoliths from NW Namibia occur in an alnoite diatreme emplaced in the Mesozoic Okenyenya alkaline complex.
- The Sloan deposits proved to be uneconomic and were closed; however, the Kelsey Lake diatremes in Colorado opened in 1996 with high expectations.
Origin Early 20th century: from dia- 'through' + Greek trēma 'perforation'. Definition of diatreme in US English: diatremenounˈdīəˌtrēm Geology A long vertical pipe or plug formed when gas-filled magma forced its way up through overlying strata. Example sentencesExamples - Various architectures connecting extrusive mud volcanic cones to their underlying source layer have been described, ranging from bulbous diapirs to steep diatremes and narrow vertical pipes.
- Lower crustal garnet granulite xenoliths from beneath the Kola-Karelian domain of the Fennoscandian Shield were brought to the surface in Devonian lamprophyre diatremes.
- The Sloan deposits proved to be uneconomic and were closed; however, the Kelsey Lake diatremes in Colorado opened in 1996 with high expectations.
- To date, the only described mantle xenoliths from NW Namibia occur in an alnoite diatreme emplaced in the Mesozoic Okenyenya alkaline complex.
- The only known igneous rocks in the area are Permian periodotite and lamprophyre dikes as well as diatremes of ultramafic composition associated with the Fluorite district.
Origin Early 20th century: from dia- ‘through’ + Greek trēma ‘perforation’. |