| 释义 |
pallasite Geol.|ˈpæləsaɪt|
[f. the name of P.S. Pallas, who discovered such a meteorite in 1772, + -ite1.]
Any of a class of stony-iron meteorites which consist largely of iron (usu. with a small proportion of nickel) and olivine. Hence pallaˈsitic a.
1868Geol. Mag. V. 78 The arrangement of the meteorites in the museum of Berlin University, by M. G. Rose, is based on their mineral character, and forms two divisions—the metallic and the stony meteorites, the first containing meteoric iron and the Pallasite, the second the Chondrites, Howardites, [etc.]. 1920Mineral Mag. XIX. 59 In most pallasites the iron is poor in nickel,..and the olivine is correspondingly poor in ferrous oxide. 1956Nature 28 Jan. 156/1 From 60 to 1,600 km. the material of the mantle is identified as dunite and from 1,600 to 3,000 km. it is taken as of the same composition as pallasitic meteorites. 1962[see mesosiderite]. 1977A. Hallam Planet Earth 134/2 This led to the speculation that ancient peridots were extraterrestrial, extracted from the meteorites known as pallasites. |