期刊
CHINESE SCIENCE BULLETIN
卷 54, 期 1, 页码 104-112出版社
SCIENCE PRESS
DOI: 10.1007/s11434-008-0362-x
关键词
leucogranite; metapelite; crustal anatexis; Himalayan Orogenic Belt; North Himalayan Gneiss Dome
资金
- National Natural Science Foundation of China [40673027]
- Chinese Academy of Geological Sciences [20071120101125]
- Chinese Academy of Sciences
The Yardoi gneiss dome is located to the easternmost of the North Himalayan Gneiss Dome (NHGD), southern Tibet. It consists of metapelite, garnet amphibolite, granite and leucogranite, and is a key subject to constrain the formation and tectonic evolution of NHGD. SHRIMP zircon U/Pb data on the leucogranite yield an age of 35.3 +/- 1.1 Ma, which is substantially older than that of the similar leucogranites to the west. Sr and Nd isotope systematics indicate that this leucogranite was derived from partial melting of the mixed garnet amphibolite and metapelite. Our data suggest that ( 1) during the early stage of Himalayan magmatism, amphibolite dehydration melting overwhelmed that of the metapelite; and (2) such a melting at middle-lower crust might be a major factor that initiated the movement along the Southern Tibetan Detachment System (STDS).
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