The Lahrauli Ureilite

Abstract

A meteorite which fell at Lahrauli, district Basti, U.P. (India) THE FALLA meteorite fall was observed on March 24. 1955 at about II a.m. in Labrauli village, Kotwali Majhauwa, near Amauli of the Basti district (26°47'N; 82°43'E) in Uttar Pradesh, India. A partially crusted fragment of this meteorite, weighing about 250 grams, is preserved in the Lucknow Museum. Figure 1 shows an interior face of this fragment. This is the same meteorite (called Basti) which was analysed by Malhotra (1962) but was later termed as the "lost Ureilite" by Marvin and Wood (1972). We prefer to call it Labrauli after the village of fall in order to distinguish it from the aubrite Bustee. The total recovered mass of this meteorite was at least 900 g. CHEMICAL AND MINERALOGICAL COMPOSITIONThe meteorite is black in appearance with scattered coarse light-coloured grains. It consists mainly oflarge olivines ofsubhedral to mostly anhedral shape. Pyroxene occurs in smaller amount. These mafic minerals are embedded in an opaque matrix. Some are surrounded by metallic or carbonaceous veins (Fig. 2a, b). The percentage of pyroxene in one section studied is about 15% and that of opaques and metals together about 20%. Olivine composition matches that in Goalpara, as shown in Table I. The Labrauli pyroxene is pigeonite W07.7Fsls. CrZ03 = 1.2% and Ah03 = 0.4%. Two analyses of metal show approximately Fe = 92%, Ni = 5.5%, Si = 3.5%; no magnesium was detected.Chemical analyses, made by atomic absorption spectrophotometry of a solution containing a known amount of the meteorite, are summarised in Table 2. Some grains remained undissolved even after repeated digestion with HF. H zS04 and perchloric acid. These were identified as chromium bearing minerals by SEM electron probe and hence the chromium content. given in Table 2 is a lower limit. There are some

Four Antarctic Ureilites: Petrology and Observations on Ureilite Petrogenisis

“…None Meteoritics, Vol. 21, No.2, June 30, 1986 169 -.I o Name/number Date discovered/fall-find Vdovykin, 1970;Berkleyet al, 1980Vdovykin, 1970Berk1eyet al, 1980Vdovykin, 1970Berkley et al, 1980Hutchinson, 1977Ottet al, 1984;Grady et al, 1985 McCall andCleverly, 1968;Vdovykin, 1970;Berkley et al, 1980 McCall andCleverly, 1968;Vdovykin, 1970;Berkley et al, 1980Maholtra, 1962Bhandari et al, 1981Neuvonenet al, 1972Berkleyet at., 1976Jaques and Fitzgerald, 1982Goodrichet al, 1985 Yamato 74123 1974/find 79 Mason and Yanai, 1983;Takeda et at., 1979a74130 1974/find 76 MasonandYanai, 1983Takedaet al, 1979b74659...…”

Abstracts

“…Here we present the nitrogen results for Lahrauli ureilite which fell in 1955 (Bhandari et al, 1981). N and noble gases have been extracted by a stepwise pyrolysis at the temperatures (0C) 800, 1000, 1200, 1300, 1400, 1500 and 1700 and analysed by standard procedures (Murty and Goswami, 1991).…”