At 21:45 hr (Beijing time ) on Oct. 31, 1990 the Yanzhuang meteorite hit the ground atthe Yanzhuang village, Wenyuan County, Guangdong Province. Several fragments, tota1ling 3. 5 kg,were recovered during the field sur...At 21:45 hr (Beijing time ) on Oct. 31, 1990 the Yanzhuang meteorite hit the ground atthe Yanzhuang village, Wenyuan County, Guangdong Province. Several fragments, tota1ling 3. 5 kg,were recovered during the field survey. This meteorite is a rare one of its kind due to its heavilyshocked features and thick veins made up of black molten materials.olivine and lowcalcium pyroxene are compositionally homogeneous with Fa= 18. 59, Fs= 16. 35and Wo = 1. 29. The chemica1 composition (total Fe=28. 0% ) and recrystallized texture of thechondritic mass show that the Yanzhuang is an H6 chondrite. The black molten materials occur inthe form of blocks (up to 2×3×4 cm in size) and veins (0.1 - 15 mm in width), and contain a lotof rounded and elliptic FeNi-FeS blobs (up to 6- 10 mm in length). The metal in these blobs exhib-its distinct dendritic str-ucture characteristic of rapid cooling. Unmolten and molten samples are verysimilar in chemical composition, fitting well with the average H-chondrites. Partial melting andFeNi/FeS-silicate separation have not been observed in the molten materials of the Yanzhuang.展开更多
文摘At 21:45 hr (Beijing time ) on Oct. 31, 1990 the Yanzhuang meteorite hit the ground atthe Yanzhuang village, Wenyuan County, Guangdong Province. Several fragments, tota1ling 3. 5 kg,were recovered during the field survey. This meteorite is a rare one of its kind due to its heavilyshocked features and thick veins made up of black molten materials.olivine and lowcalcium pyroxene are compositionally homogeneous with Fa= 18. 59, Fs= 16. 35and Wo = 1. 29. The chemica1 composition (total Fe=28. 0% ) and recrystallized texture of thechondritic mass show that the Yanzhuang is an H6 chondrite. The black molten materials occur inthe form of blocks (up to 2×3×4 cm in size) and veins (0.1 - 15 mm in width), and contain a lotof rounded and elliptic FeNi-FeS blobs (up to 6- 10 mm in length). The metal in these blobs exhib-its distinct dendritic str-ucture characteristic of rapid cooling. Unmolten and molten samples are verysimilar in chemical composition, fitting well with the average H-chondrites. Partial melting andFeNi/FeS-silicate separation have not been observed in the molten materials of the Yanzhuang.
