Three new carbonaceous chondrites (GRV 020025,021579 and 022459) collected from the Grove Mountains (GRV), Antarctica, have been classified as the CM2, CO3 and CV3 chondrites, respectively. A total of 27 Ca- and Al-ri...Three new carbonaceous chondrites (GRV 020025,021579 and 022459) collected from the Grove Mountains (GRV), Antarctica, have been classified as the CM2, CO3 and CV3 chondrites, respectively. A total of 27 Ca- and Al-rich inclusions have been found in the three meteorites, which are the earliest assemblages formed in the solar nebula. Most of the inclusions are intensively altered, with abundant phyllosilicates in the inclusions from GRV 020025 and FeO enrichment of spinel in those from GRV 022459. Except for one spinel-spherule in each of GRV 020025 and 021579, all the inclusions can be classified as Type A-like or spinel-pyroxene-rich inclusions, and they probably represent the continuum of solar nebular condensation. In addition, most of the inclusions in these meteorites share much similarity in both petrography and mineral chemistry, suggesting a similar origin of Ca-Al-rich inclusions in various chondrites.展开更多
The Boxian meteorite (LL3-4), fallen in October 1977, possesses low degree of thermal metamorphism and good chondrule texture. A Ca-Al-rich chondrule （CA chondrule） was found in this chondrite. This chondrule is ca....The Boxian meteorite (LL3-4), fallen in October 1977, possesses low degree of thermal metamorphism and good chondrule texture. A Ca-Al-rich chondrule （CA chondrule） was found in this chondrite. This chondrule is ca. 0.36 mm in diame ter. There is only one light red euhedral spinel crystal, ca. 34％ in volume of this chondrule, while prismatic fassaite crystals occupy ca. 29％ and only one small crystal of olivine and light brown intergranular glass of the above minerals, ca. 37％ （Fig. 1）.展开更多
基金This work was supported by the pilot project of knowledge-innovation of Chinese Academy of Sciences(Grant No:KZCX3-SW-123)the National Natural Science Foundation of China(Grant No.40025311).
文摘Three new carbonaceous chondrites (GRV 020025,021579 and 022459) collected from the Grove Mountains (GRV), Antarctica, have been classified as the CM2, CO3 and CV3 chondrites, respectively. A total of 27 Ca- and Al-rich inclusions have been found in the three meteorites, which are the earliest assemblages formed in the solar nebula. Most of the inclusions are intensively altered, with abundant phyllosilicates in the inclusions from GRV 020025 and FeO enrichment of spinel in those from GRV 022459. Except for one spinel-spherule in each of GRV 020025 and 021579, all the inclusions can be classified as Type A-like or spinel-pyroxene-rich inclusions, and they probably represent the continuum of solar nebular condensation. In addition, most of the inclusions in these meteorites share much similarity in both petrography and mineral chemistry, suggesting a similar origin of Ca-Al-rich inclusions in various chondrites.
文摘The Boxian meteorite (LL3-4), fallen in October 1977, possesses low degree of thermal metamorphism and good chondrule texture. A Ca-Al-rich chondrule （CA chondrule） was found in this chondrite. This chondrule is ca. 0.36 mm in diame ter. There is only one light red euhedral spinel crystal, ca. 34％ in volume of this chondrule, while prismatic fassaite crystals occupy ca. 29％ and only one small crystal of olivine and light brown intergranular glass of the above minerals, ca. 37％ （Fig. 1）.
