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Notes on brown hornblende and biotite from Shabō-zan, of the Dalton volcanoes, Taiwan, Japan

Published online by Cambridge University Press:  14 March 2018

Takeshi Ichimura
Takeshi Ichimura*
Affiliation:
Taihoku Imperial University, Taiwan, Japan
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Extract

The Dalton volcanoes include all the volcanic groups which rise up at the north-western end of Taiwan (Formosa). They are old extinct volcanoes underlain by highly disturbed Tertiary sediments. Among them Shichisei-zan is the highest and the most prominent, rising up to 1108.7 metres above sea-level. It is mostly made up of hornb]ende-andesite, hypersthene-hornblende-andesite, and agglomerates. On the western slope of this partly dissected volcano there is a very characteristic cone called Shabō-zan. Its elevation is 643 metres above sea-level, and it is mostly made up of hypersthenehornblende- andesite poured out through the thick accumulation of agglomerates. The andesite here has usually a grey colour, but often passes into a light reddish-brown variety, being sometimes associated with a noritic segregation mass. It is noteworthy that some of the andesites abundantly contain brown hornblende. This mineral also frequently appears, together with brown biotite, in the segregation mass.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 22 , Issue 134 , September 1931 , pp. 561 - 568
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1931

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References

page 561 note 1 T. Ichimura, On the segregation masses contained in the hypersthene-horn-blende-andesite from Shabō-zan Taiwan. [Japanese.] Trans. Nat. Hist. Soc. Formosa, 1929, vol. 19, pp. 406-409.

page 564 note 1 X. Galkin, Chemische Untersuchung einiger Hornblenden und Augite aus Basalten der Rhön. Neues Jahrb. Min., 1910, Beil-Bd. 29, pp. 689, 688, 694.

page 564 note 2 Y. Deguehi, Geological report on the Dalton volcanoes. [Japanese.] P. 28,

page 566 note 1 S. Kōzu, B. Yoshiki, and K. Kani, Sci. Rep. Tōhoku University, Ser. 3, 1927, vol. 3, p. 143 [Min. Abstr., vol. 3, p. 495].

page 566 note 2 S. Kōzu, An interesting example of the mode of occurrence of basaltic horn blende associated with anomitic biotite in the quartz-andesite which forms the volcano Sambé, Japan. Proc. 4th Pan-Pacific Science Congress, Java, 1929, vol. 2, B, p. 721 [Min. Abstr., vol. 4, p. 287].

page 567 note 1 Williams, H., Geology of the Marysville Buttes, California. Univ. Calif. Publ. Bull. Dept. Geol. Sci., 1929, vol. 18, no. 5, p. 194.Google Scholar

page 567 note 2 References given by V. E. Barnes, Changes in hornblende at about 800° C. Amer. Min., 1930, vol. 15, pp. 393-417 [Min. Abstr., vol. 4, p. 391].