| 释义 |
kaersutite Min.|kɛəˈsʊtaɪt|
[ad. Da. kaersutit (J. Lorenzen 1884, in Meddelelser om Grønland VII. 27), f. Kaersut, name of the locality (on the shore of Umanak Fiord on the west coast of Greenland) where it was first found: see -ite1.]
A dark brown or black kind of hornblende characterized by a high titanium content and occuring as a constituent of many volcanic rocks.
1886Jrnl. Chem. Soc. L. 519 Analyses of minerals from Greenland... Kærsutite, colour black, streak brown. 1939Trans. & Proc. R. Soc. N.Z. LXIX. 305 It appears that in the Dunedin district brown monoclinic amphiboles occur very generally in the only slightly alkaline basalts and trachybasalts of the first and second volcanic phases, and prove to be basaltic hornblendes which in the two samples analysed have just sufficient content of TiO2 to permit their being classed as kaersutite. 1966W. A. Deer et al. Introd. Rock-Forming Min. ii. 177 Kaersutite is a typical constituent of alkaline volcanic rocks, and occurs as phenocrysts in trachybasalts, trachyandesites, trachytes..and alkali rhyolites; in the more silica-rich rocks it occurs also as a groundmass constituent. 1968Mineral. Mag. XXXVI. 1001 Aoki (1963) considered an amphibole from a trachyte with 4·36% TiO2 (0·49 Ti) as not a typical kaersutite... It is clear that any lower limit of titanium for kaersutite must be an arbitrary one.
Hence kaersuˈtitic a., of the nature of or resembling kaersutite.
1968Mineral. Mag. XXXVI. 1001 The data..strongly suggest that upper mantle amphibole is probably a kaersutitic hornblende. |