极地研究

极地研究 ›› 2009, Vol. 20 ›› Issue (2-English): 200-208.

• 研究论文 • 上一篇    下一篇

GRV 051523: A new eucrite

 Liu Tao1,2, Lin Yangting3, Hu Sen3 and Feng Lu3   

  1. 1 Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China;
    2 Graduate School of Chinese Acad emy of Sciences, Beijing 100049, China;
    3 Key Laboratory of the Study of Earth's Deep Interior, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China
  • 出版日期:1959-06-30 发布日期:1959-06-30
  • 通讯作者: Liu Tao

GRV 051523: A new eucrite

 Liu Tao1,2, Lin Yangting3, Hu Sen3 and Feng Lu3   

  1. 1 Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China;
    2 Graduate School of Chinese Acad emy of Sciences, Beijing 100049, China;
    3 Key Laboratory of the Study of Earth's Deep Interior, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China
  • Online:1959-06-30 Published:1959-06-30
  • Contact: Liu Tao

PDF (PC)

878

摘要：

Grove Mountains ( GRV) 051523 is a new ly identified eucrite, consisting mainly of coarse-grained pyroxene ( 62. 9 vol%) and plagioclase ( 34. 2 vol%), with less abundant opaquem inerals ( 2.7 vol%), minor silica and tiny FeO-rich olivine ( Fa75 ). Coarse-grained pyroxenes show exsolution of augite lamellae in pigeonite or vice versa. Width of most exsolution lamellae in pyroxenes is 1-3 μm. Opaquem inerals are mainly chromite, ilmenite and sulfides. Themeteorite was heavily shocked, as indicated by breccias andmelt veins. Coarse-grained pyroxenes commonly contain abundant tiny or needle-like chromite inclusions with orientation, probably due to heavy shock events. Pyroxenes in various petrographic occurrences exhibit highly homogeneous compositions, indicating that GRV 051523 experienced intense thermal metamorphism in the parent asteroid 4 Vesta. GRV 051523 is classified as Type 5-6. This new eucrite will have additional constraints on chemical composition, magmatic differentiation, multi-stage shock and thermal history of Vesta.

关键词: meteorite, eucrite, Antarctic meteorite, thermal metamorphism, Vesta

Abstract:

Grove Mountains ( GRV) 051523 is a new ly identified eucrite, consisting mainly of coarse-grained pyroxene ( 62. 9 vol%) and plagioclase ( 34. 2 vol%), with less abundant opaquem inerals ( 2.7 vol%), minor silica and tiny FeO-rich olivine ( Fa75 ). Coarse-grained pyroxenes show exsolution of augite lamellae in pigeonite or vice versa. Width of most exsolution lamellae in pyroxenes is 1-3 μm. Opaquem inerals are mainly chromite, ilmenite and sulfides. Themeteorite was heavily shocked, as indicated by breccias andmelt veins. Coarse-grained pyroxenes commonly contain abundant tiny or needle-like chromite inclusions with orientation, probably due to heavy shock events. Pyroxenes in various petrographic occurrences exhibit highly homogeneous compositions, indicating that GRV 051523 experienced intense thermal metamorphism in the parent asteroid 4 Vesta. GRV 051523 is classified as Type 5-6. This new eucrite will have additional constraints on chemical composition, magmatic differentiation, multi-stage shock and thermal history of Vesta.

Key words: meteorite, eucrite, Antarctic meteorite, thermal metamorphism, Vesta