A DISCUSSION ON SOME ANTARCTIC QUASI-C1 CHONDRITES ORIGIN AND RANGE OF NEBULAR HYDROUS EFFECT
Received date: 1994-08-15
Revised date: 1994-09-26
Online published: 1995-08-01
Because of containing many phyllosilicate aggregates and similar oxygen isotopic composition to C1 carbonaceous chondrite, the Antarctic carbonaceous chondrite, Y-82162, Y-86720, Belgica-7904,PCA-91082, Y-793495 and Y-8449 are called as quasi-C1 chondrite. In these carbonaceous chondrites the phyllosilicate aggregates exist as four forms: (1)matrix, (2)clast with same composition of matrix, (3)chondrule, (4)dark inclusion. This four forms are independence relatively in meteorite, so the hydrous effect must take place after nebular condensation and before meteorite parent body formation. Besides phyllosilicate aggregates, some higher temperature condensates or their remainder, for example, non-completely hydrous chondrite, anhydrous silicate mineral and their aggregate, appear in these meteorites. In different meteorite the composations of higher temperature condensate remainder are various, from enstatite, silica mineral, to moderate Fe-rich o-livine, Fe-rich olivine. According to above evidences and this fact that water has been observed on Mar, Earth and Mercury, we consider that range of nebular hydrous effect could be wide, including terrestrial planet region and asteroids region of solar nebular.
Hou Wei, Ouyang Ziyuan . A DISCUSSION ON SOME ANTARCTIC QUASI-C1 CHONDRITES ORIGIN AND RANGE OF NEBULAR HYDROUS EFFECT[J]. Advances in Earth Science, 1995 , 10(4) : 373 -377 . DOI: 10.11867/j.issn.1001-8166.1995.04.0373
[1] Tomeoka K et al. Yamato-82162: A new kind of CI carbonaceous chondrite found in Antarctica. Proceedings of the NIPR on Antarctic Meteorites,1989,2:36-54.
[2] Tomeoka K et al. Yamato-86720: A CM carbonaceous chondrite having experienced extensive aqueous alteration and thermal metamorphism. Proceedings of the NIPR on Antarctic Meteorites,1989,2:55-74.
[3] Tomeoka K. Mineralogy and petrology of Belgica-7904: A new kind of carbonaceous chondrite from Antarctica. Proceedings of the NIPR on Antarctic Meteorites,1990,3:40-54.
[4] Yamamoto K and Makamura N. REE characteristics of Yamato-82162 and -86720 meteorites and their inference to classification. Proceedings of the NIPR on Antarctic Meteorites,1990,3:69-79.
[5] Paul R L. Lipschutz. Consortium study of labile trace elements in some Antarctic carbonaceous chondrites: Antarctic and non-Antarctic meteorite comparisons. Prceechings of the NIPR on Antarctic Meteorites,1990,3:80-95.
[6] Prinz M et al.Type I and II chondres in the B-7904 carbonaceous chondrire. Abstract of 52th Meeting of the Meteoritical Society,1989.317-318.
[7] Noguchi T. Comparison of petrology and mineralogy of thePCA-91082 and the Yamato-793495(CR) chondrites: on the phyllosilicate clasts. Papers presented to the nineteenth symposiumon Antarcric meteorites. National Institute of Polar Research,TOKYO,1994,16-17.
[8] Ichikawa O and Ikeda Y. Petrology of Yamato-8449 chondrite (CR). Papers presented to the nineteenth symposium on Antarctic mereorites. National Institute Polar Researeh,TOKYO,1994,18-19.
[9] Weisberg M. The CR Chondrite Clan. Papers presented to the nineteenth symposiumon Antarctic meteorites. National Institute of Polar Researeh,TOKYO,1994,131-133.
[10] 美国天文家发现水星上存在冰湖.中国科学报(国际科技版),1994年7月15日.
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