This work was supported by the National Natural Science Foundation of China(Grant Nos.40472119 and 40172071);the Progranme of Excelent Young Scientists of the Ministry of Land and Resources,the Ministry of Science and Technology of the People's Republic of China(Grant No.2002CB412608);the China Geological Survey(Grant No.200313000057).
SHRIMP U-Pb zircon analyses for a gabbro sample from the Garzê ophiolite block yielded a mean 206Pb/238U age of 292±4 Ma, which indicated that the spread- ing time of the Garzê-Litang Tethys was most likely at the ...