摘要:

Buchwald's (1975) theory of thermally induced cracking inSerrania de Varasis critically examined from the standpoint of elementary stress analysis. New metallographic observations are presented. It is suggested that thermal cracking is unlikely to have been operating in this material.

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1982.tb00555.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Calcium‐aluminium‐rich chondrules were found in L‐3 (ALH‐77015) and LL‐3 (ALH‐77278) chondrites. They consist of spinel, olivine, fassaite and glassy groundmass enriched in anorthite component. The bulk chemical compositions of the two chondrules are nearly the same and resemble those of the calcium‐aluminium‐rich inclusions in the carbonaceous chondrites, but the former is more enriched in MgO and SiO2and depleted in Al2O3and CaO. The calcium‐aluminium‐rich chondrules would have been primarily early condensates which existed at the place where the chondrules were formed, and heated up to 1400 °C or higher to have melted and cooled at the rate similar to those for other chondrules, or the products of intensive heating followed

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1982.tb00556.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Allan Hills A79003 is an LL3 chondrite with a petrologic subtype of 3.4 ± 0.2. Contrary to previous suggestions, it is not paired with other Allan Hills specimens. It contains haxonite, (Fe, Ni)23C6; shock‐melted, ‘fizzed’ metal‐troilite intergrowths; and translucent, glassy‐looking Huss matrix (fine‐grained, Fe‐rich silicate matrix), in addition to the normal opaque and recrystallized varieties of Huss matrix. Some chondrules are partly coated with opaque matrix, others with translucent matrix. Translucent matrix is more uniform in composition and contains less S, CaO and FeO and more MgO than the opaque variety. Both kinds of matrix rimmed chondrules before consolidation of

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1982.tb00557.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

The Indonesian meteorites, Selakopi, an H‐5 chondrite, and Glanggang, a breccia with H‐6 fragments is an H‐5 chondritic matrix, were recovered on the same day from sites only 50 km apart. The textures and compositions of Selakopi and the H‐5 portion of Glanggang are very similar, indicating that they are closely related. The bulk chemistry of the H‐6 portion of Glanggang is also very similar to that of the samples mentioned. It has therefore been concluded that Selakopi and the Glanggang breccia fragments were derived from the same source area and were probably ejected at the same time. Minor differences in bulk composition and texture among the three samples may be attributed to local variations on the parent body. However, for reasons stipulated in the conclusion, we recommend that separate names be maintained for these meteorites until further, more definitive investigations have

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1982.tb00558.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1982.tb00559.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1982.tb00560.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1982.tb00561.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

ISSN:0026-1114    

DOI:10.1111/j.1945-5100.1982.tb00562.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY