nephelinite वाक्य
उदाहरण वाक्य
मोबाइल
- This lava, known as olivine nephelinite, is also unusual because it contains small, angular to rounded fragments of rock called nodules.
- The site is among a zone of dark-coloured pyroclasts of varying sizes, dating from the Pleistocene era, made of basanite and nephelinite.
- However, dating of sediments in a lake dammed by the nephelinite lavas suggest the lava flows could not be younger than mid-Holocene and could be early Holocene or older.
- This rock is the plutonic and holo-crystalline analogue of the nephelinites and nepheline-dolerites; it bears the same relation to them as the nepheline syenites have to the phonolites.
- Nyiragongo's lavas are made of melilite nephelinite, an alkali-rich type of volcanic rock whose unusual chemical composition may be a factor in the unusual fluidity of the lavas there.
- Magmas of rock types such as nephelinite, carbonatite, and kimberlite are among those that may be generated following an influx of carbon dioxide into mantle at depths greater than about 70 km.
- Tephritic nephelinite has a value between 0.6 and 0.9 . Nephelinite has a value greater than 0.9 . Le Maitre ( 2002 ) defines and discusses these and other criteria in the classification of igneous rocks.
- Tephritic nephelinite has a value between 0.6 and 0.9 . Nephelinite has a value greater than 0.9 . Le Maitre ( 2002 ) defines and discusses these and other criteria in the classification of igneous rocks.
- In the late stages of eruption of individual volcanoes, more alkaline basalt also was erupted, and in the very late stages after a period of erosion, rocks of unusual composition such as nephelinite were produced in very small amounts.
- The Cenozoic platform ( which is also known as the " unconsolidated rock " level because the Cenozoic sedimentary rocks, due to their young age, have often not experienced intensive diagenesis and are therefore often not SiO 2-rich ) volcanic rocks of the transition level, the Cenozoic formations are mostly intermediate to very SiO 2-poor ( trachyte, basalt, phonolite, tephrite, nephelinite and basanite ).
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