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High-Mg andesites and basalts in the southern Nishisonogi Peninsula, Nagasaki Prefecture

Center of Instrumental Analysis, Yamaguchi University Volume 8 Page 24-37
published_at 2000
KJ00000199470.pdf
[fulltext] 1.17 MB
Title
<研究報告>長崎県西彼杵半島南部の高Mg安山岩と玄武岩
High-Mg andesites and basalts in the southern Nishisonogi Peninsula, Nagasaki Prefecture
Creators Shiraki Keiichi
Creators Miyamoto Mitsutaka
Creators Matsuo Hiroaki
Creators Ueki Yuko
Creators Azuma Takateru
Creators Nagao Takashi
Creators Matsumoto Yukio
Creators Tajima Toshihiko
Source Identifiers
The late Cenozoic volcanic rocks in the southern Nishisonogi Peninsula, which are characterized by dominance of undifferentiated, primitive rocks, show a large variation in chemical composition ranging from high-Mg andesite (HMA) through tholeiitic basalt to alkali basalt and from high-Mg basalt to rhyolite. Most HMA is cpx-HMA crystallized clinopyroxene with the highest Mg# and Cr_2O_3 of 87.4 and 1.24%, respectively, following olivine with the highest Fo of 92.1 and NiO of 0.48%. An orthopyroxene andesite containing bronzite with Mg# and Cr_2O_3 as high as 89.5 and 1.06%, respectively, was found at Ebisu-zaki, the second opx-HMA occurrence in this area. Many of the pyroxene andesites reveal high Cr (>100ppm)
Languages jpn
Resource Type departmental bulletin paper
Publishers 山口大学機器分析センター
Date Issued 2000
File Version Version of Record
Access Rights open access
Relations
[NCID]AN1046804X
Schools 機器分析センター