Provenance of the Upper Paleocene to Early Eocene strata, Gyantze, south Tibet:Implications for early Himalaya thickening
The provenance of the upper Paleocene to Early Eocene strata in Tethys Himalaya records early history of crustal thickening and sedimentation. This paper reports detailed in-suit detrital zircon U-Pb ages and whole rocks Nd-isotopes data from Upper Paleocene to Lower Eocene Jiachala Formation of the Tethys Himalaya in Gyantze, southern Tibet. The Jiachala Formation consists of sandstone and mudstone. The largest detrital zircon age population is within the range of 350 -80 Ma, 900 -470 Ma,and 1 300 -950 Ma. There are also some scatted ages between 2 800 - 1 500 Ma. Sandstones of the Jiachala Formation yield 87Sr/86 Sr = 0. 707 505-0.713 174,143Nd/144Nd = 0. 512 206-0.512 355 ,εNd(0)= -5. 52 - -8. 43. Detrital sediments were mainly derived from the Xigaze forearc basin and Upper Triassic Langjiexue Group, and subordinately from the Yarlung-Zangpo suture zone. Our study indicates that the Jiachala Foramtion was deposited in peripheral foreland basin, and significant crustal thickening occurred during Early Eocene.
国家科技期刊平台
NSTL
万方数据
维普
