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Picrite basalt

Avatar 37a3bd7bc7328f0ead2c0f6f635dddf60615e676e6b4ddf964144012e529de45 kiran asked over 3 years ago

Write a note on Picrite basalt?

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Avatar 37a3bd7bc7328f0ead2c0f6f635dddf60615e676e6b4ddf964144012e529de45 answered over 3 years ago

Picrite basalt

Picrite basaltpicrobasalt is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine. It is dark with yellow-green olivine phenocrysts (20 to 50%) and black to dark brown pyroxene, mostly augite.

The olivine-rich picrite basalts that occur with the more common tholeiitic basalts of KÄ«lauea and other volcanoes of the Hawaiian Islands are the result of accumulation of olivine crystals either in a portion of the magma chamber or in a caldera lava lake.The compositions of these rocks are well represented by mixes of olivine and more typical tholeiitic basalt.

The name “picrite” can also be applied to an olivine-rich alkali basalt: such picrite consists largely of phenocrystsof olivine and titanium-rich augite pyroxene with minor plagioclase set in a groundmass of augite and more sodic plagioclase and perhaps analcite and biotite.


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