Abstract
Abstract
Two alternative petrogenetic models, plagioclase flotation and serial magmatism have been proposed to explain the origin of the lunar anorthositic crust, covering ~80% of the lunar highland. In this study, we re-examine the possible relict igneous texture present in an inferred lunar highland breccia clast (area ~1 mm2) in the Dhofar 081 meteorite. Our new petrographic and in-situ mineral microprobe chemical data on this clast show this coarse grained (average grain size ~0.5 mm) clast preserves relict igneous texture where subhedral, prismatic low-Ca pyroxene has intergrown with anhedral anorthitic plagioclase, suggesting its eutectic crystallization from its parent silicate magma. Absence of maskelynite and similarity of Na, K contents of plagioclase with the FAN assemblages negate the possibility of crystallization of the studied relict clast from an impact melt. The mineral-chemical data of Dhofar 081 suggest it is FAN (Ferroan anorthosite) in composition (after Warren in Annu. Rev. Earth Planet. Sci. 13:201–240, 1985). Hence, intergrown crystallization of minerals in the present relict igneous clasts and other reported FAN samples argues against a cumulate origin of the lunar anorthosite. The orthopyroxenes present in the unbrecciated portion of this meteoritic clast include bimodal low- and high-iron geochemical sub-groups. The application of orthopyroxene and plagioclase thermobarometry (after Gasparik in Contrib. Mineral. Petrol. 96:357–370, 1987) on our new microprobe data, and also two-pyroxene thermometry (after Lindsley in Am. Mineral. 68:477–493, 1983; Putirka in Rev. Mineral. Geochem. 69(1):61–120, 2008) on our new microprobe data and synthesis of literature data constrain the pressure and temperature of crystallization of lunar anorthosite parent magma close to 8 kbar and 1050°C, respectively. Application of Fo–An–Q experimental phase diagram at high pressure (up to 20 kbar) negates the possibility of generation of lunar anorthosite from a lherzolite source, the parent magma of these anorthosites probably lie on or close to Fo–An join of this phase diagram close to the spinel field.
Research Highlights
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Lunar anorthositic meteorite represents the global highland crust of Moon.
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Relict igneous clast of lunar anorthositic meteorite shows intergrown texture vis-a-vis eutectic crystallisation.
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Pressure and temperature of crystallisation of parent magma close to 8 kbar and 1050°C.
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Serial magmatism is consistent to explain the textural and mineral-chemical characters and vis-à-vis petrogenesis of lunar anorthosite.
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Acknowledgements
DR acknowledges to the Natural History Museum, London (sincere thanks to S S Russell and N Almeida), for providing the lunar meteorite sample Dhofar 081 (BM2004, M5, P12263), and the Department of Space (Government of India) for financial support for this research. SM is indebted to NRF, South Africa (Grant No. 91089) for this study. Critical comments by two anonymous reviewers and Rajneesh Bhutani, Associate Editor are greatly appreciated.
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Ray, D., Misra, S. & Nelson, D.R. Lunar feldspathic meteorite Dhofar 081: Petrochemical constraints on petrogenesis. J Earth Syst Sci 130, 39 (2021). https://doi.org/10.1007/s12040-020-01499-6
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DOI: https://doi.org/10.1007/s12040-020-01499-6