摘要:

The principal data are collected about the fall and the distribution of the fragments of the Valdinizza, Italy, meteorite. A complete individual, weighing 872 g, preserved in the United States National Museum, Washington, D. C., is described in some detail. The mineralogical composition is olivine, Fa25; hypersthene, Fs23; plagioclase, An10; maskelynite; nickel‐iron; troilite; chromite; ilmenite and possibly a phosphate mineral. Valdinizza is a fairly typical hypersthene chondrite, belonging to the type 6 chondrites of Van Schmus and Wood (1967); its structure shows evidence of a period of high‐temperature recrystallization; interesting features of shock‐metamorphism are notable, the microtexture deformations suggesting a high level of

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1971.tb00400.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1971.tb00401.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

One of the most important steps in the recovery and study of meteorites is the concise naming of each fall so that confusion of one fall with another is avoided. The presently‐used system of naming meteorite falls has been arrived at through an evolutionary process spurred on by necessity. The evolutionary history of the naming of meteorite falls is briefly sketched. Current naming practices are defined and the mounting problems of the present system are discussed. Measures for forestalling growing confusion in the naming of contiguous and overlapping falls, based upon a partial survey of curators of meteorite collections, are presented. A suggestion for the elimination of confusion in the dating of meteorite discoveries is includ

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1971.tb00402.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

Small iron meteorites may be cut with high‐speed plastic‐bonded carborundum wheels, with hacksaws or automatic modifications of these, and with carbide‐tipped wheels; to date, no simple method has been available for cutting large iron meteorites. The successful sectioning of a 20‐ton meteorite involved the use of a mason's wire‐saw, fed with a slurry of carborundum‐grit. The slab produced measured 1.8 × 1.3 × 0.05 m and could be ground and polished for deep‐etching, with a minimum

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1971.tb00403.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1971.tb00404.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

A meteoritic event was observed from the vicinity of Prince George, British Columbia, at 5h58mU.T., August 21, 1969, and an associated ground impact wave was recorded by several seismograph stations. An analysis of the visual and seismic data indicates that a mass of several tons must have reached the ground about 20 km southeast of Prince George. A helicopter search of the area and a study of aerial photographs have failed to locate the impact site

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1971.tb00405.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1971.tb00406.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1971.tb00407.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1971.tb00408.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY