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The value of lunar material accessible for detailed studies

Development of the ion microprobe provided a potential for direct measurement of IlB/lOB on solid samples, obviating the need for fastidious chemical extractions. But the possibility of contamination during the preparation of polished sections remained a serious source of error, in addition to the instrumental problems of ensuring that the boron peaks at masses 10 and 11 were free of interfering masses. A series of ion probe papers by Marc Chaussidon and colleagues (e .g . , Chaussidon and Robert, 1995; Hanon et al., 1999) described the startling results that llB/lOB ratios varied from point to point within chondrules (i .e. , on a micron scale) without any mineralogical evidence which could explain such heterogeneity. Chondrules from the meteorites Semarkona, Hedjaz and Allende showed 611B values ranging between -50 to +40!%, which is a larger range than can be found on Earth. The interpretation of these results was that they are