284 PETROLOGICAL ABSTRACTS AND REVIEWS 



Kato, Takeo. "The Tourmaline Copper Veins in the Yakuoji 

 Mine, Nagato Province, Japan," Jour. Geol. Soc. Tokyo, XIX 

 (1912), 69-88. 

 The copper veins of the Yakuoji mine occur at the contact between a 

 monzonite stock and Paleozoic sediments, 3 kilometers east of Oda in the 

 province Nagato. Near the contact with the eruptive rock the meta- 

 morphosed sandstones and sandy slates are traversed by innumerable 

 minute veinlets consisting chiefly of chlorite and rare tourmaline. The 

 latter mineral occurs in irregular patches and is considered by the author 

 as replacing feldspar grains, partially or entirely. 



A. J. 



KiLLiG, Franz. Das Korund- und Paragonitvorkommen am 



Ochsenkopf hei Schwarzenherg in Sachsen. Inaug. Diss., 



Greifswald, 191 2. 



The corundum of the Ochsenkopf is a product of regional meta- 



morphism and was derived, contemporaneously with the formation of 



the surrounding phyllite, from an aluminium rich sediment. The 



paragonite is not an alteration product of the corundum but has been 



derived independently from the normal phyllite. 



A. J. 



KoLDERUP, Carl Fred. " SogneskoUens og Bremangerlandets 

 granodioriter," Bergens Museums Aarbok, 191 1, Nr. 18, pp. 30. 

 Describes various granodiorites. The rock from Sogneskollen, in 

 western Norway, is post-Silurian in age. It consists of about 70 per cent 

 feldspar, predominantly oligoclase, with some microperthite, microcline, 

 and orthoclase; 23^ per cent quartz, 6 per cent biotite, and some epidote, 

 garnet, titanite, pyrite, and sericite. The granodiorite of the Island of 

 Svano occurs in the form of a dike. It contains 55! per cent plagioclase 

 (oligoclase-albite and albite), 12 per cent orthoclase and microcline, 23 

 per cent quartz, 9 per cent muscovite and epidote, and one-third of i 

 per cent zircon, apatite, and titanite. The Bremangerland rock con- 

 sists of 62 per cent feldspar which is entirely andesine, oligoclase, and 

 albite. No orthoclase occurs although a little K.O is shown by the 

 analysis. Quartz makes up 27! per cent of the rock, biotite 9 per cent, 

 magnetite two-thirds of i per cent, and pyrite one-third of i per cent. 

 This rock cuts the Silurian strata and occurs in fragments in the Devo- 

 nian. Analyses are given of all of the rocks. 



A.J. 



