Volcanic rocks of Songwori were first discovered by the authors in 1996  The volcanic rocks are distributed in an east—west belt east of Ni ma County,Tibet,close to the southern border of the Bangong lake—Nujiang sut ure zoneThe volcanic rocks are dominated by intermediate—basic lava and pyr oclastic rocks,discondantly overlying the Mugagr Kangri GroupPetrochemical ana lyses of the volcanic rocks show that they are calcalkaline lavas and are a ma jor member of the volcanic islandarc in the Gandise—Nyaingentanglha