- 著者
-
応地 善雄
- 出版者
- 日本鉱物科学会
- 雑誌
- 岩石鉱物鉱床学会誌 (ISSN:00214825)
- 巻号頁・発行日
- vol.45, no.4, pp.133-136, 1961
Phenocrystic olivine in picritic basalt from Mishima island and olivine in olivine nodule in trachybasalt from Tsukue island are chemically analysed and are expressed in following chemical formulas:<br> (Mg<sub>1.63</sub> Fe''<sub>0.30</sub> Fe<sub>0.06</sub>)<sub>1.99</sub> (Si<sub>0.98</sub> Ti<sub>0.01</sub>)<sub>0.99</sub> O<sub>4.00</sub><br> (Mg<sub>1.80</sub> Fe''<sub>0.14</sub> Fe<sub>0.05</sub>)<sub>1.99</sub> Si<sub>0.98</sub> O4.00<br> The former is distinctly richer in Fe than the latter. Such difference is attributed to their origin as already discussed by Ross and others.