mafic In A Sentence
Learn how to use mafic in a sentence and make better sentences with `mafic` by reading mafic sentence examples.
- A mafic andesite lava flow was erupted from the high cone that also features red scoria.
- Diorite results from the partial melting of a mafic rock above a subduction zone.
- Outcrops of silicified mafic pillow lava are found along and west of the Ontario Northland Railway, east of the Big Dan Shear Zone and adjacent to Outlet Bay and Boot Bay of Net Lake.
- This caldera is composed of highly tectonised, stretched felsic volcanic rocks, interleaved with a significant thickness of equally sheared titaniferous differentiated mafic sills.
- It is difficult to melt mafic metamorphic rocks except in the lower mantle, so it is rare to see migmatitic textures in such rocks.
- Their geochemical characteristics of trace elements and Nd and Sr isotopes show that these mafic rocks erupted in a back-arc basin.
- Garnet, commonly almandine or spessartine, is a common mineral within pegmatites intruding mafic and carbonate-bearing sequences.
- Basaltic lava flows in the Picotani area are the only mafic volcanics.
- Layers of mafic andesite, scoria and some pumice extend outwards away from the central sector.
- The SIC is believed to be a stratified impact melt sheet composed from the base up of sublayer norite, mafic norite, felsic norite, quartz gabbro, and granophyre.
- A petrologic boundary, it separates the deeper, mafic igneous rock of the Central Pacific Basin from the partially submerged continental areas of felsic igneous rock on its margins.
- All are dominated by quartzofeldspathic gneiss with a few percent mafic rock ( eclogite ) or ultramafic rock ( garnet-bearing peridotite ).
- Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present.
- Granulite facies pelitic gneiss and mafic granulite outcropping in the Larsemann Hills, East Antarctica, underwent a complicated deformational metamorphic history.
- The magma mingling between mafic magma and felsic magma is the primary mechanism responsible for the granitoids of crust-mantle mixed source.
- A lava flow containing mafic andesite is associated with the cone.
- The Great Dyke of Zimbabwe is a layered mafic intrusion of igneous, metal-bearing rock that has been dated to approximately 2.5 billion years old.
- The sedimentary fill of the basins consists largely of alluvial fan and mafic volcanic flows.
- Biotite is generally of low content and the main mafic minerals are clinopyroxene ( ?) and amphibole ( ?).
- Typically, they are less resistant to weathering than the enclosing aphanitic rock and, as a result, form pock-marks on the weathered surfaces of mafic rocks.
- There are no absorption features of mafic minerals found.
- The rock is an uncommon mafic igneous rock known as a troctolite.
- The mineral was first described in a petrographic study of a sample of a mafic diatreme at Coyote Peak.
- Observations which support delamination include sudden mafic volcanism and acceleration of uplift, occurring 14 to 11 Ma.
- The mafic minerals, when present, are magnetite and an iron-rich variety of biotite ( lepidomelane ).
- "' Variolites "'are mafic, igneous, and typically volcanic German name for a type of variolite . " Gamaicu " is a local South American name for a type of variolite.
- They are also classified as felsic or mafic, depending on the kinds and relative amounts of light and dark minerals.
- Higher than normal potassium favors the production of orthoclase, which is usually absent from most mafic igneous rocks.
- Augite is the most common ferro-magnesian in mafic rocks, but biotite and hornblende are on the whole more frequent in felsic rocks.
- Spatter cones and spatter ramparts are typically formed by lava fountaining associated with mafic, highly fluid lavas, such as those erupted in the Hawaiian Islands.
- Mafic inclusions form a minor but ubiquitous part of the andesitic lavas that compose the bulk of the dome material.
- Some mafic parts exist, they also have greenschist assemblages of actinolite, plagioclase and sometimes epidote or clinozoisite.
- The peak consists of non-alkali mafic rocks, dating from the Early Pleistocene overtop of non-alkali felsic rocks from the Late Miocene-Pliocene.
- The buoyancy of a microcontinent locally slows the rollback of and steepens the dip of subducting mafic lithosphere.
- Phenocrysts are mostly plagioclase, with mafic phenocrysts being dominated by orthopyroxene and smaller amounts of biotite, clinopyroxene, and hornblende.
- This layer would constitute a density barrier to the rise of mafic magma.
- These minerals are typical weathering products of mafic igneous rocks.
- The metasedimentary rocks are quartz-rich and the amphibolites represent mafic igneous intrusions.
- Metamorphic felsic gneiss and mafic gneiss formations are common in the northern parts of the watershed.
- Several holes were drilled and intersected mostly mafic to intermediate volcanic rocks and areas of stringer sulfides with pyrrhotite, pyrite and some chalcopyrite.
- Lower mantle melt rates would form mafic melts that incorporate silicic melts before erupting.
- Lava flows of the mafic shield-building stage columnated into four sub-horizontal units.
- Cumulate layering is very common in large mafic intrusions.
- Plagioclase will be altered to sericite ( a fine-grained white mica ) by sericitic alteration, and mafic minerals are replaced by quartz.
- Niobium-enriched arc basalts are mildly- to highly-alkalic mafic lavas that contain relatively higher amount of high field-strength elements (HFSE) than normal arc lavas.
- Of the mafic minerals present, augite is the most common.
- The Tuzgle volcano proper is constructed from an older rhyodacite-mafic series and a more recent series constructed from andesites alone.
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