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The probes revealed the existence of long, hundreds of kilometers, gravity anomalies, here and there coming out to the surface. Most probably, they indicate that under the surface there are long and elongated, narrow "shafts" of dense magma solidified a long time ago. Many volcanic structures have been found by the Grail spacecraft. These are tectonic structures, basins of impact craters, ancient linear gravity anomalies.Previous articles showed correlation dependence of the chemical composition of rocks on the macrostructure of the lunar surface. The surface macrostructure was evaluated by comparing the local phase function with the lunar spatial scattering indicatrix. The gravitational field of the Moon is strongly associated with its relief - such a connection is not observed either at the Earth, or Mars and Venus. It can be assumed that mascons include rich KREEP rocks with a high content of thorium and iron oxide. KREEP rocks in the areas of the lunar Maria covered by volcanic lava are probably located on the surface or at a shallow depth. Formation of mascons is connected with intensive development of basaltic volcanism on the Moon in the early periods of its existence.