In central Yarlung-Zangbo Suture zone, southern Tibet, there exist two subparallel E-W trending linear aeromagnetic high anomalies, ca. 25 km apart. The north magnetic lineament is related to Gangdese batholith, the south one is Xigaze ophiolites, and they are separated by Xigaze fore-arc basin. Gangdese granitoid batholith is formed during Mesozoic arc magmatism and Cenozoic syn-collisional magmatism in the southern margin of Lhasa terrane, producing strong-magnetized rocks, e.g. I-type granites, diorite and minor gabbro. We conduct 3D inversion of the aeromagnetic anomaly data to explore the deep structure of Gangdese batholith.By analysis of our inverted model, we propose that Gangdese batholith has a magmatic root with higher magnetization than the exposed granitoids, indicating the deeper part of Gangdese batholith may contain more mafic constitutes.


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