
purvi heera

purvi diamente ack pandubbi jwalamukhi haye joe uttar-paschimi prashant mahasagar key uttari mariana dweepon mein anatahan key dakshin mein sthit haye. yeh izu-bonin-mariana chaap kaa hissa haye aur jall-taapiya roop seey sakriya haye, jisamen isake shikhar parr ack jatil, lamba caldera hotaa haye.
bhoovigyaan.
purvi diamente dakshini izu-bonin-mariana chaap mein dou pandubbi jwalamukhi mein seey ack haye jisamen felsic magma kaa visfot huaa haye, doosara zeelandia baink haye. desite praathamik chattan kaa prakaar haye aur aam taur parr isamen ack porphyritic banaavat hoti haye, jisamen phenochrist quartz, plagioclays, clinopyroxin, orthopyroxin aur iron-titanium oxide key matricks mein antarnihit hotey hain. kull chattan kii matra mein phenochrist kaa yogdan 41 pratishat taka haye.
purvi diamente kaa shikhar samudra tala seey neeche sthit haye aur ack lambe, uttar-poorv-dakshin-paschim-pravritt caldera dwara kaataa gayaa haye. caldera key gathan key baad ack kendriya gumbad parisar kaa sthaan aur dakshin-paschim caldera rima parr ack jwalamukhiya shanku kaa nirmaan kiya gayaa. kendriya gumbad parisar kaale dhumrapan karane vaalon sahit jall-taapiya gatividhi koo pradarshit kartaa haye.
caldera key ander seey desite key argan-argan detting ney 20,000 ± 4000 varshon kii ayu dee haye, joe darshaata haye kii jwalamukhi playstocene key anta mein sakriya thaa. jwalamukhiya kaal holocene taka jaari rhaa, lekin antim visfot kii ayu agyaat haye.