On September 10, 1978, the Lishui ehondrite fell near Lishui County, Jiangsu Province (31°38'N, 118°59″E). The recovered mass was 498g in weight. Chemical analysis gave: SiO2 39.10, FeO 13.64, TiO2 0.112, Al2O3 1.952, CaO 1.691,MgO 25.46, K2O 0.106, Na2O 1.041, P2O5 0.255, MnO 0.325, Cr2O3 0.533, CO3 0.056, Fe 7.488, Ni 1.293, Pb0.008, Zn 0.062, FeS 6.405, HsO^+ 0.10, total 99.683. Fifteen minerals identified in the meteorite are chrysolite (Fa 24%), bronzite,hypersthene, kamaeite, taenite, treifite, plagioclase, chromite, whithockite, apatite,calcite, quartz, zircon, magnetite, and hematite. Modal analysis gave: the first 7 minerals totalling 97.89% (olivine 45.36%, pyroxene 27.98%). The texture of chondrite is very complicated. Chondrules may be classified as monasomatic and polysomatic.Ones there is a wide range of textural type in polysomatie chondrules. Chemico-petrological studies have shown that the meteorite belongs to L-greup ehondrites,and petrologically to type 5.
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.
On September 13, 1977, the Qingzhen enstatite chondrite fell near Qingzhen county,Kweichow Province (26°32'E, 106°28'N). The total recovered mass was 2.6kg in weight. Phenomena of the meteorite fall were recorded as well. In the present paper some of the significant observations are described. X-ray diffraction analyses and petrologic studies have revealed that it is mainly composed of enstatite/clinoenstatite,plagioclase, troilite, kamocite, taenite, quartz and oldhamite. X-ray electron micro.probe analyses have been performed on orthoenstatite and elinoenstatite. Chemical analyses have given the following results: SlO2--36.48; Al2O3--1.64; TiO2--0.08;Cr2O3--0.28 ; FeO--0.30; MnO--0.25 ; MgO--18.19 ; CaO--1.14; No2O--1.06; K2O-0.11;H2O^+--0.47; H2O^-0.10; P2O5--0.39; FeS--13.35; Fe°--22.94; Ni-1.81; Co--0.093;C-0.37; Cu-0.022; Zn-0.027; CaS--0.60 ; total--99.70. This meteorite has been extremely reduced ; all iron is present as FeS and metallic Fe-Ni. The Qingzhen enstatite chondrite is characterized by higher rotio of Si to Mg as compared with ordinary chondrites, scarcity of olivine, and enrichment in surfur and iron. In the thin section, it is observed that rounded chondrules approximately account for 10--15 per cent; being porphyrific, radiating, excentroradial, of excentric fan in shape. Devitrified ehondrules composed of pyroxenes have been also identified. It is postulated from its mineralogy,chemistry and textural characteristics that the Qingzhen meteorite should be assigned to EA-grenp ehondrites.
