| 释义 |
Definition of gabbro in English: gabbronounPlural gabbrosˈɡabrəʊˈɡæbroʊ mass nounGeology A dark, coarse-grained plutonic rock of crystalline texture, consisting mainly of pyroxene, plagioclase feldspar, and often olivine. 〔地质〕辉长岩 count noun olivine gabbros Example sentencesExamples - Contacts between plutons of gabbro or hybrid rock and granite are commonly marked by net-vein complexes.
- Jansen also describes gabbro, diabase, ultrabasic rocks and Permian limestones in a comparable section on Naxos.
- Permian and Triassic plutonic complexes comprise monzonite, granite, granodiorite or tonalite with minor gabbro and diorite.
- The deepest layer is gabbro, coarse-grained but chemically equivalent to basalt, which forms when magma cools and crystallizes slowly.
- The highest core recovery occurs in the massive olivine gabbro, which contain lower densities of fractures and are generally undeformed.
Derivativesadjectiveɡaˈbrəʊɪk Geology Of far less importance are occurrences in gneisses and amphibolites, in small plutons derived from syenitic and gabbroic magmas, and in certain contact-metamorphic rocks. Example sentencesExamples - The plutons are composed of medium - to coarse-grained, porphyritic quartz monzonite, quartz syenite and granite, together with smaller amounts of equigranular gabbroic and monzonitic rocks.
- The drilling of nine cored boreholes, including a deep hole to a gabbroic basement, in the vicinity of the Rhyme chert locality has resulted in a major revision of the structure and stratigraphy of the area.
- This is based on preservation of original gabbroic textures and occurrence of intergranular coesite in UHP rocks.
- This magmatism is typically of gabbroic to granitic composition and also shows evidence of mixed sedimentary and mantle-like sources.
adjective Geology These have been intersected by numerous small discontinuous lensoid bodies or larger dykes of gabbroid rocks, which shew considerable variety both in mineralogical constitution and texture, and are especially prominent on the western margin of Kerr Point. Example sentencesExamples - Following, or partly during, their amalgamation, the terranes of the Arabian shield were covered by younger Neoproterozoic volcanic and sedimentary rocks and intruded by relatively undeformed granitoid and subordinate gabbroid rocks.
- Hess's hypothesis on the serpentinite composition of the lower oceanic crust was confirmed by serpentinite and gabbroid fragments dredged from some fracture zones.
- Syntectonic intrusion and metamorphism of the cooling Kyzylkain gabbroid bodies proceeded at high chemical activity of water and, practically throughout, were manifested in the production of gabbro-amphibolites regardless of initial body shape and position in the Kempirsay ophiolite structure.
- The enclaves in the mentioned basaltoids represent peridotites, pyroxenites and gabbroid rocks.
OriginMid 19th century: from Italian, from Latin glaber, glabr- 'smooth'. Definition of gabbro in US English: gabbronounˈɡabrōˈɡæbroʊ Geology A dark, coarse-grained plutonic rock of crystalline texture, consisting mainly of pyroxene, plagioclase feldspar, and often olivine. 〔地质〕辉长岩 count noun olivine gabbros Example sentencesExamples - Contacts between plutons of gabbro or hybrid rock and granite are commonly marked by net-vein complexes.
- The highest core recovery occurs in the massive olivine gabbro, which contain lower densities of fractures and are generally undeformed.
- The deepest layer is gabbro, coarse-grained but chemically equivalent to basalt, which forms when magma cools and crystallizes slowly.
- Permian and Triassic plutonic complexes comprise monzonite, granite, granodiorite or tonalite with minor gabbro and diorite.
- Jansen also describes gabbro, diabase, ultrabasic rocks and Permian limestones in a comparable section on Naxos.
OriginMid 19th century: from Italian, from Latin glaber, glabr- ‘smooth’. |