DOI: 10.3724/SP.J.1084.2013.00386

Chinese Journal of Polar Research (极地研究) 2013/25:4 PP.386-393


The Heyetang meteorite is an ordinary chondrite that fell in October 1998. The petrologic subtype of the Heyetang meteorite was determined on the basis of detailed petrologic and mineralogical characteristics. The mean value of Fa in the olivine is 23.2, with a range from 0.6 to 48.8 (percent mean deviation (PMD)=60.1%). The mean value of Fs in low-Ca pyroxene is 9.1 with a range from 0.6 to 49.0(PMD=97.5%). Thus, it is an unequilibrated type 3 ordinary chondrite. The chemical group was indicated by Fa value, the total Fe-Ni metal and troilite contents, the Co and Ni contents in kamacite and it actually has L group features. According to the PMD of Fa content in olivine, the Cr2O3 content in olivine and Ni-rich metals in chondrules, the petrologic subtype of the Heyetang meteorite belongs to L3.3. Therefore, Heyetang meteorite is one of the most primitive ordinary chondrites in all of the non-Antarctic meteorites in China.

Key words:Heyetang, ordinary meteorite, unequilibrated meteorite, L3.3

ReleaseDate:2014-07-21 16:59:40

1 Huss G R, Rubin A E, Grossman J N. Thermal Metamorphism in Chondrites//Lauretta D S, McSween H Y Jr. Meteorites and the Early Solar System II. Arizona: The University of Arizona Press, 2006: 567-586.

2 Davis A M, Holland H D, Turekian K K. Treatise on Geochemistry, Volume 1 Meteorites, Comets, and Planets. Oxford: Elsevier, 2003: 83-190.

3 Sears D W, Morse A D, Hutchison R, et al. Metamorphism and aqueous alteration in low petrographic type ordinary chondrites. Meteoritics, 1995, 30(2): 169-181.

4 Ruzicka A, Snyder G A, Taylor L A. Mega-chondrules and large, igneous-textured clasts in Julesberg (L3) and other ordinary chondrites: Vapor-fractionation, shock-melting, and chondrule formation. Geochimica et Cosmochimica Acta, 1998, 62(8): 1419-1442.

5 国际陨石学会网站

6 中国极地研究中心极地标本资源共享平台

7 Rubin A E. Kamacite and olivine in ordinary chondrites: Intergroup and intragroup relationships. Geochimica et Cosmochimica Acta, 1990, 54(5): 1217-1232.

8 Grossman J N, Brearley A J. The onset of metamorphism in ordinary and carbonaceous chondrites. Meteoritics & Planetary Science, 2005, 40(1): 87-122.

9 Kimura M, Grossman J N, Weisberg M K. Fe-Ni metal in primitive chondrites: Indicators of classification and metamorphic conditions for ordinary and CO chondrites. Meteoritics & Planetary Science, 2008, 43(7): 1161-1177.

10 缪秉魁, 林杨挺, 欧阳自远, 等. 南极格罗夫山陨石岩石学特征-Ⅰ: 非平衡型L3型普通球粒陨石. 极地研究, 2002, 14(4): 276-287.

11 Keil K. On the phase composition of meteorites. Journal of Geophysical Research, 1962, 67(10): 4055-4061.

12 Reisener R J, Goldstein J I. Ordinary chondrite metallography: Part 2. Formation of zoned and unzoned metal particles in relatively unshocked H, L, and LL chondrites. Meteoritics & Planetary Science, 2003, 38(11): 1679-1696.

13 王道德, 缪秉魁, 林杨挺. 陨石的矿物-岩石学特征及其分类. 极地研究, 2005, 17(1): 45-74.

14 Sears D W, Grossman J N, Melcher C L, et al. Measuring metamorphic history of unequilibrated ordinary chondrites. Nature, 1980, 287(5785): 791-795.