porphyritic वाक्य
उदाहरण वाक्य
मोबाइल
- The predominant igneous rock is porphyritic hornblende diorite.
- Porphyritic dacites contain blocky highly zoned plagioclase phenocrysts and / or rounded corroded quartz phenocrysts.
- Porphyritic rocks are formed when a column of rising magma is cooled in two stages.
- Some are equigranular, others are porphyritic.
- The dacites have a white porphyritic appearance.
- The appearance of Lastarria lavas is porphyritic.
- It has an aphanitic to porphyritic texture and is intermediate in composition between andesite and rhyolite.
- However, porphyritic varieties do occur.
- The lavas of Taftan are porphyritic.
- This lava dome is formed by porphyritic andesite and has dimensions of at an altitude of.
- For example, porphyritic andesite will have large phenocrysts of plagioclase in a fine-grained matrix.
- Most is strongly deformed, but least-deformed areas show a relict porphyritic to equigranular texture.
- The porphyritic trachytes erupted at the summit of the shield and flowed towards the northeast and east.
- "Porphyritic " textures develop when conditions during cooling of a magma change relatively quickly.
- Porphyritic plagioclase andesite of the youngest unit underlies much of the southern and western portions of Meager.
- The surrounding loose rock was cleared away by the ice sheet leaving the hard porphyritic core behind.
- Gneiss is the predominant rock with a few granite Porphyritic matrices occasionally occur in the rock formations.
- Aphanites are commonly porphyritic, having large crystals embedded in the fine groundmass or inclusions are called phenocrysts.
- The sequence has been divided into a lower pillowed tholeiitic unit and an upper porphyritic alkali basalt unit.
- The hamlet of Bluestone is named after a granite boulder porphyritic crystals, which are no longer visible.
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