N and Ne–Ar abundances and isotope ratios are reported for 12 igneous lunar rocks.
Some mare basalts show low 15N/14N ratios, similar to Earth's primordial mantle.
class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0012821X15005890&_mathId=si1.gif&_user=111111111&_pii=S0012821X15005890&_rdoc=1&_issn=0012821X&md5=50b032e81fd07bdfebaef047fd76712f" title="Click to view the MathML source">未15Nclass="mathContainer hidden">class="mathCode"> values class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0012821X15005890&_mathId=si4.gif&_user=111111111&_pii=S0012821X15005890&_rdoc=1&_issn=0012821X&md5=a9f003bebcc4a9e810dd716c91e66510" title="Click to view the MathML source">≥0‰class="mathContainer hidden">class="mathCode"> require an addition of 15N-rich material to the Earth–Moon system.
The data suggest that the LMO acquired N from the assimilation of C chondrites.
The anorthositic crust might be N-free but highland breccias trap impact-derived N.