The distribution and exterior characters of each individual meteorite are presented for the iron meteorite shower in Nantan County, Kwangsi Chuang Autonomous Regiou,China. Nineteen iron meteorites have been found up t...The distribution and exterior characters of each individual meteorite are presented for the iron meteorite shower in Nantan County, Kwangsi Chuang Autonomous Regiou,China. Nineteen iron meteorites have been found up to date, umounting approximately to 9,500 kg in total weight and spreading over an area of about 30 square kilometers. As compared with other iron meteorites known in China, they are much larger in size and contuin much more mineral species. It is also interesting to note that a complete sample of various parts of a primitive meteorite can be expected. The discovery of this meteorite shower is considered to be of significant value in science.展开更多
The melting crust of Kirin Meteorite can be divided into two types: the initial melting shell and the secondary melting shell. Resulting from rapid chilling of hot melts in an oxidation atmosphere, they consist of mie...The melting crust of Kirin Meteorite can be divided into two types: the initial melting shell and the secondary melting shell. Resulting from rapid chilling of hot melts in an oxidation atmosphere, they consist of mierolites (initial melting shell)and crystallites (secondary melting shells) of magnetite and glasses of the composition of Si, Mg and Fe. A gradation shell is observed under the melting crust. Its upper parts composed of dust-like magnetite, while the lower parts are made up largely by network veiulet of troilite of secondary origin. They are the products of thermal diffusion under oxidation and reduction conditions respetively. Indications of partial melting have been found within the gradation shell. The average temperature gradient has been estimated to be 20° C/micron and 1.6° C/micron for the melt in meteorite surface and the surface of solid phases respeetively. The temperature can be expressed as a function of depth by the empirical formula of T = 10000 H^-0.42.展开更多
On Mareh 11,1977,the Changde stone meteorite shower fell near the town of Changde,Hunan Province(29°05'N,111°45'E).The total recovered mass vas 1.81kg in weight(900g,254g,220g,184g,50g,20g,11.8g,20g,...On Mareh 11,1977,the Changde stone meteorite shower fell near the town of Changde,Hunan Province(29°05'N,111°45'E).The total recovered mass vas 1.81kg in weight(900g,254g,220g,184g,50g,20g,11.8g,20g,20g,18.3g,and 113g)X-ray diffraction analyses and microseopic identification have indicated the presence of the following minerals:olivine(175,Fa),orthopyroxene(18% Fs),elinopyroxene,plagioclase,orthoclase,whitlockite,kamocite,taenite,troilite and chromite,Turbid glass has been found in chondrules.Shock effect has bee also observed in olivinc and pyroxene.Chemical analyses have given;SiO2 37.61,TiO2 0.086,Al2O3 2.18,Cr2O3 0.52,FeO 8.00,MnO 0.18,MgO22.87,CaO 1.92,Na2O 0.87,K2O 0.11,H2O^- 0.06,H2O^+0.06,P2O5 0.21,Fe°18.44,Ni 1.80,Co0.091,Cu0.014,Zn0.006,FeS5.59,C 0.16,total 100.78 Model analysis gives;olivine 26.86%,pyroxene 36.62%,plagioclase 9.06%,orthoclase 0.65%,whitlockite 0.46%,titanite 0.17%,kamocite and taenite 20.24%,troilite 5.59%,Chemieo-petrological stndies have shown that the meteorite bclongs to H-group chondrites,and petrologically to Type 5.Based upon the textures of the chondrules,a model of the evolution for the Changde chondrite is presented.展开更多
文摘The distribution and exterior characters of each individual meteorite are presented for the iron meteorite shower in Nantan County, Kwangsi Chuang Autonomous Regiou,China. Nineteen iron meteorites have been found up to date, umounting approximately to 9,500 kg in total weight and spreading over an area of about 30 square kilometers. As compared with other iron meteorites known in China, they are much larger in size and contuin much more mineral species. It is also interesting to note that a complete sample of various parts of a primitive meteorite can be expected. The discovery of this meteorite shower is considered to be of significant value in science.
文摘The melting crust of Kirin Meteorite can be divided into two types: the initial melting shell and the secondary melting shell. Resulting from rapid chilling of hot melts in an oxidation atmosphere, they consist of mierolites (initial melting shell)and crystallites (secondary melting shells) of magnetite and glasses of the composition of Si, Mg and Fe. A gradation shell is observed under the melting crust. Its upper parts composed of dust-like magnetite, while the lower parts are made up largely by network veiulet of troilite of secondary origin. They are the products of thermal diffusion under oxidation and reduction conditions respetively. Indications of partial melting have been found within the gradation shell. The average temperature gradient has been estimated to be 20° C/micron and 1.6° C/micron for the melt in meteorite surface and the surface of solid phases respeetively. The temperature can be expressed as a function of depth by the empirical formula of T = 10000 H^-0.42.
文摘On Mareh 11,1977,the Changde stone meteorite shower fell near the town of Changde,Hunan Province(29°05'N,111°45'E).The total recovered mass vas 1.81kg in weight(900g,254g,220g,184g,50g,20g,11.8g,20g,20g,18.3g,and 113g)X-ray diffraction analyses and microseopic identification have indicated the presence of the following minerals:olivine(175,Fa),orthopyroxene(18% Fs),elinopyroxene,plagioclase,orthoclase,whitlockite,kamocite,taenite,troilite and chromite,Turbid glass has been found in chondrules.Shock effect has bee also observed in olivinc and pyroxene.Chemical analyses have given;SiO2 37.61,TiO2 0.086,Al2O3 2.18,Cr2O3 0.52,FeO 8.00,MnO 0.18,MgO22.87,CaO 1.92,Na2O 0.87,K2O 0.11,H2O^- 0.06,H2O^+0.06,P2O5 0.21,Fe°18.44,Ni 1.80,Co0.091,Cu0.014,Zn0.006,FeS5.59,C 0.16,total 100.78 Model analysis gives;olivine 26.86%,pyroxene 36.62%,plagioclase 9.06%,orthoclase 0.65%,whitlockite 0.46%,titanite 0.17%,kamocite and taenite 20.24%,troilite 5.59%,Chemieo-petrological stndies have shown that the meteorite bclongs to H-group chondrites,and petrologically to Type 5.Based upon the textures of the chondrules,a model of the evolution for the Changde chondrite is presented.
