Abstract
Ion microprobe studies of magnesium isotopic composition in igneous components from several chondritic meteorites have been carried out to look for26Mg excess that may be attributed to the presence of the now-extinct radionuclide26Al(τ ∼ 1 Ma) at the time of formation of these objects. A positive evidence for the presence of26Al in the analysed objects will strengthen its case as the primary heat source for the early thermal metamorphism/melting of meteorite parent bodies. Based on calculated temperature profiles inside chondritic objects of different sizes and initial26Al/27Al ratios, we have estimated the initial abundances of26Al needed to provide the heat necessary for the wide range of thermal processing seen in various types of meteorites. The magnesium isotopic data obtained by us do not provide definitive evidence for the presence of26Al at the time of formation of the analysed igneous phases in different chondritic meteorites. Experimental evidence for a planetary scale distribution of26Al in the early solar system to serve as a significant heat source for the thermal metamorphism and melting of meteorite parent bodies (planetesimals) remains elusive.
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References
Bernius M T, Hutcheon I D and Wasserburg G J 1991 Search for evidence of26Al in meteorites that are planetary differentiates;Lunar and Planetary Science XXII 93–94
Catanzaro E J, Murphy T J, Garner E L and Shields W R 1966 Absolute isotopic abundance ratios and atomic weights of magnesium;J. Res. Natl. Bur. Stand. A70 453–458
Cameron A G W 1993 Nucleosynthesis and star formation; InProtostars and planets III (eds) E H Levy and J I Lunine (Tucson: The Univ. of Arizona Press) 47–73
Cameron A G W 1995 The first ten million years in the solar nebula;Meteoritics 30 133–161
Chen J H and Wasserburg G J 1981 The isotopic composition of uranium and lead in Allende inclusions and meteoritic phosphates;Earth Planet. Sci. Lett. 52 1–15
Göpel C, Manhès G and Allègre C J 1989 U-Pb study of phosphates in chondrites;Meteoritics 24 270–271
Goswami J N, Srinivasan G and Ulyanov A A 1994 Ion microprobe studies of Efremovka CAIs: 1. Magnesium isotope composition;Geochim. Cosmochim. Acta 58 431–447
Goswami J N and Srinivasan G 1994 Isotopic analysis of early solar system objects by an ion microprobe: Parametric studies and initial results;Proc. Indian Acad. Sci. (Earth Planet. Sci.) 103 57–82
Hewins R H and Newsom H E 1988 Igneous activity in the early solar system; InMeteorites and the early solar system (eds) J F Kerridge and M S Matthews (Tucson: The Univ. of Arizona Press) 73–101
Herbert F, Sonett C P and Gaffey M J 1991 Protoplanetary thermal metamorphism: The hypothesis of electromagnetic induction in the protosolar wind; InThe Sun in time (eds) C P Sonett, M S Giampapa and M S Matthews (Tucson: The Univ. of Arizona Press) 710–739
Hutcheon I D and Hutchison R 1989 Evidence from the Semarkona ordinary chondrite for26Al heating of small planets;Nature (London)337 238–241
Hutcheon I D, Huss G R and Wasserburg G J 1994 A search for26Al in chondrites: Chondrules formation time scale;Lunar and planetary science XXV 587–588
Hutcheon I D and Jones R H 1995 The26Al-26Mg record of chondrules: Clues to nebular chronology;Lunar and planetary science XXVI 647–648
Ivanov A V 1989 The Kaidun meteorite: Composition and history;Geochem. International 26 84–91
Ivanova M A, Zaslavskay N I and Kononkova N N 1992 The Dengli H3 complex breccia: A 1976 find from the Karakoom desert;Meteoritics 27 463–464
Ivanova M A, Assonov S S, Kononkova N N and Shukolyukov Yu A 1993 The Dengli (H3.8) complex breccia: Petrological and isotopic studies;Meteoritics 28 371
Ivanova M A and Krot A N 1994 Chromite chondrules and inclusions in ordinary chondrites;Geochem. International 31 19–35
Kennedy A K, Hutchison R, Hutcheon I D and Agrell S O 1992 A unique high Mn/Fe microgabbro in the Parnallee (LL3) ordinary chondrite: Nebular mixture or planetary differentiate from a previously unrecognized planetary body;Earth Planet. Sci. 113 191–205
Krot A N and Ivanova M A 1992 Cr-rich chondrules and inclusions in ordinary chondrite;Lunar and Planetary Science XXIII 729–730
Krot A N, Mitreikina O B, Ivanova M A, Stroganov I A and Zinovyeva N G 1992 Chromite chondrules from the ordinary chondrite Raguli(H3-4) and Cullison(H4): Mineralogy and chemistry;Lunar and Planetary Science XXIII 733–734
Lee T, Papanastassiou D A and Wasserburg G J 1976 Demonstration of26Mg excess in Allende and evidence for26Al;Geophys. Res. Lett. 3 109–112
Lugmair G W and Galer S J G 1992 Age and isotopic relations among the angrites Lewis Cliff 86010 and Angra dos Reis;Geochim. Cosmochim. Acta 56 1673–1694
Lugmair G W, Shukolyukov A and MacIsaac Ch 1995 The abundance of 60Fe in the early solar system; InNuclei in the cosmos (In press)
MacPherson G J, Davis A M and Zinner E K 1992 Distribution of26Al in the early solar system — A reappraisal;Meteoritics 27 253–254
MacPherson G J, Davis A M and Zinner E K 1995 26Al in the early solar system;Meteoritics (In press)
Manhès G, Göpel C and Allègre C J 1987 High resolution chronology of the early solar system based on lead isotopes;Meteoritics 22 453
McSween H Y, Sears D W G and Dodd R T 1988 Thermal metamorphism; InMeteoritics and the early solar system (eds) J F Kerridge and M S Matthews (Tucson: The Univ. of Arizona Press) 102–113
McSween H Y and Grimm R E 199426Al as an asteroidal heat source?Meteoritics 29 500–501
Migdisova L F, Yaroshevsky A A and Kononkova N N 1992 The inclusion in the L-chondrite Tsarev: New type of basaltic matter in the solar system;Lunar and Planetary Science XXIII 909–910
Migdisova L F, Yaroshevsky A A, Nazarov M A and Kononkova N N 1994 Textural and mineralogical heterogeneity of silicate inclusions in Tsarev chondrites;Lunar and Planetary Science XXV 905–906
Nazarov M A, Brandstätter F and Kurat G 1993 Igneous rock from Severnyi Kolchim (H3) chondrite:Nebular origin,Lunar and Planetary Science XXIV 1055–1056
Podosek F A, Zinner E K, MacPherson G J, Lundberg L L, Brannon J C and Fahey A J 1991 Correlated study of initial87Sr/86Sr and Al-Mg isotopic systematics and petrologic properties in a suite of refractory inclusions from the Allende meteorite;Geochim. Cosmochim. Acta 55 1083–1110
Sahijpal S, Goswami J N, Kashkarov L L, Korotkova N N and Nazarov M A 1994 Search for26Mg isotopic anomaly in unequilibrated chondrites and unique meteorites;Lunar and Planetary Science XXV 1185–1186
Schramm D N, Tera F and Wasserburg G J 1970 The isotopic abundance of26Mg and limits on26Al in the early solar system;Earth Planet. Sci. Lett. 10 44–59
Scott E R D, Taylor G J, Newsom H E, Herbert F, Zolensky M and Kerridge J F 1989 Chemical, thermal and impact processing of asteroids; InAsteroids II (eds) R P Binzel, T Gehrels and M S Matthews (Tucson: The Univ. of Arizona Press) 701–739
Shukolyukov A and Lugmair G W 1993a60Fe in Eucrites;Earth Planet. Sci. Lett. 119 159–166
Shukolyukov A and Lugmair G W 1993b Live iron 60 in the early solar system;Science 259 1138–1141
Srinivasan G, Ulyanov A A and Goswami J N 199441Ca in the early solar system;Astrophys. J. (Lett.) 431 L67-L70
Srinivasan G 1994 Ion microprobe isotopic studies of Ca-Al-rich inclusions from primitive meteorites; Ph. D. Thesis (M.S. Univ. Baroda)
Tera F, Carlson R W and Boctor N Z 1989 Contrasting Pb-Pb ages of the cumulate and non-cumulate eucrites;Lunar and Planetary Science XX 1111–1112
Urey H C 1955 The moon; InThe planets 57
Wasserburg G J 1985 Short-lived nuclei in early solar system; InProto stars and planets II (eds) D C Black and M S Matthews (Tucson: The Univ. of Arizona Press) 703–737
Wood J A and Pellas P 1991 What heated the parent meteorite planets? InThe Sun in time (eds) C P Sonnett, M S Giampapa and M S Matthews (Tucson: The Univ. of Arizona Press) 740–760
Zinner E and Göpel C 1992 Evidence for26Al in feldspars from H4 chondrite Ste. Marguerite;Meteoritics 27 311–312
Zolensky M and McSween H Y 1988 Aqueous alteration; InMeteorites and the early solar system (eds) J F Kerridge and M S Matthews (Tucson: The Univ. of Arizona Press) 114–143
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Sahijpal, S., Ivanova, M.A., Kashkarov, L.L. et al. 26Al as a heat source for early melting of planetesimals: Results from isotopic studies of meteorites. Proc. Indian Acad. Sci. (Earth Planet Sci.) 104, 555–567 (1995). https://doi.org/10.1007/BF02839296
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DOI: https://doi.org/10.1007/BF02839296