The Central Asian Orogenic Belt (CAOB), also known as the Altaid Tectonic Collage, is characterized by extensive Paleozoic and Mesozoic granitic intrusions and basaltic to rhyolitic volcanics. The granitoids exhibit a wide range of compositions, evolving from calc-alkaline to alkaline to peralkaline series. Most granitic plutons were emplaced between 500 and 1200 million years ago, though precise dating is limited. This paper documents available Nd isotopic data to argue that massive juvenile continental crust was generated during the Phanerozoic in Central Asia. Phanerozoic granitoids in Central Asia are characterized by low initial Sr isotopic ratios, positive εNd(T) values, and young Sm-Nd model ages (TDM) of 300 to 1200 million years. This contrasts with granitoids in classic orogenic belts like the European Caledonides and Hercynides, Cathaysia of SE China, and South Korea, which have more recycled Precambrian crust. The isotope data suggest that Central Asian granitoids are "juvenile" and derived from source rocks or magmas separated shortly from the upper mantle. Negative εNd(T) values occur near Precambrian blocks, indicating contamination by older crust. The evolution of the CAOB is linked to the accretion of young arc complexes and old terranes. However, the emplacement of large volumes of post-tectonic granites requires additional mechanisms, such as underplating of massive basaltic magma, intercalation with lower crustal granulites, partial melting of mixed lithologic assemblages, and extensive fractional crystallization. The juvenile or mantle component proportions for most Central Asian granitoids are estimated to vary from 70% to 100%. The recent discovery of juvenile crust in several Phanerozoic orogenic belts, including the CAOB, may significantly change our understanding of continental growth. The CAOB represents the most significant mass transfer from the mantle to the continental crust during the Phanerozoic.The Central Asian Orogenic Belt (CAOB), also known as the Altaid Tectonic Collage, is characterized by extensive Paleozoic and Mesozoic granitic intrusions and basaltic to rhyolitic volcanics. The granitoids exhibit a wide range of compositions, evolving from calc-alkaline to alkaline to peralkaline series. Most granitic plutons were emplaced between 500 and 1200 million years ago, though precise dating is limited. This paper documents available Nd isotopic data to argue that massive juvenile continental crust was generated during the Phanerozoic in Central Asia. Phanerozoic granitoids in Central Asia are characterized by low initial Sr isotopic ratios, positive εNd(T) values, and young Sm-Nd model ages (TDM) of 300 to 1200 million years. This contrasts with granitoids in classic orogenic belts like the European Caledonides and Hercynides, Cathaysia of SE China, and South Korea, which have more recycled Precambrian crust. The isotope data suggest that Central Asian granitoids are "juvenile" and derived from source rocks or magmas separated shortly from the upper mantle. Negative εNd(T) values occur near Precambrian blocks, indicating contamination by older crust. The evolution of the CAOB is linked to the accretion of young arc complexes and old terranes. However, the emplacement of large volumes of post-tectonic granites requires additional mechanisms, such as underplating of massive basaltic magma, intercalation with lower crustal granulites, partial melting of mixed lithologic assemblages, and extensive fractional crystallization. The juvenile or mantle component proportions for most Central Asian granitoids are estimated to vary from 70% to 100%. The recent discovery of juvenile crust in several Phanerozoic orogenic belts, including the CAOB, may significantly change our understanding of continental growth. The CAOB represents the most significant mass transfer from the mantle to the continental crust during the Phanerozoic.