/pdf/tibetan-tectonic-evolution-inferred-from-spatial-and-1f7oxv9x3m.pdf

Tibetan tectonic evolution inferred from spatial and temporal variations in post-collisional magmatism

Phanerozoic tectonics of the South China Block: Key observations and controversies

On the ages of flood basalt events

article i nfo The Lhasa Terrane in southern Tibet has long been accepted as the last geological block accreted to Eurasia before its collision with the northward drifting Indian continent in the Cenozoic, but its lithospheric architecture, drift and growth histories and the nature of its northern suture with Eurasia via the Qiangtang Terrane remain enigmatic. Using zircon in situ U-Pb and Lu-Hf isotopic and bulk-rock geochemical data of Mesozoic-Early Tertiary magmatic rocks sampled along four north-south traverses across the Lhasa Terrane, we show that the Lhasa Terrane has ancient basement rocks of Proterozoic and Archean ages (up to 2870 Ma) in its centre with younger and juvenile crust (Phanerozoic) accreted towards its both northern and southern edges. This finding proves that the central Lhasa subterrane was once a microcontinent. This continent has survived from its long journey across the Paleo-Tethyan Ocean basins and has grown at the edges through magmatism resulting from oceanic lithosphere subduction towards beneath it during its journey and subsequent collisions with the Qiangtang Terrane to the north and with the Indian continent to the south. Zircon Hf isotope data indicate significant mantle source contributions to the generation of these granitoid rocks (e.g., ~50-90%, 0-70%, and 30-100% to the Mesozoic magmatism in the southern, central, and northern Lhasa subterranes, respectively). We suggest that much of the Mesozoic magmatism in the Lhasa Terrane may be associated with the southward Bangong-Nujiang Tethyan seafloor subduction beneath the Lhasa Terrane, which likely began in the Middle Permian (or earlier) and ceased in the late Early Cretaceous, and that the significant changes of zircon eHf(t) at ~113 and ~52 Ma record tectonomagmatic activities as a result of slab break-off and related mantle melting events following the Qiangtang-Lhasa amalgamation and India-Lhasa amalgamation, respectively. These results manifest the efficacy of zircons as a chronometer (U-Pb dating) and a geochemical tracer (Hf isotopes) in understanding the origin and histories of lithospheric plates and in revealing the tectonic evolution of old orogenies in the context of plate tectonics.

The Lhasa Terrane: Record of a microcontinent and its histories of drift and growth

/pdf/revised-definition-of-large-igneous-provinces-lips-3c10x1yfrr.pdf

Revised definition of Large Igneous Provinces (LIPs)

http://ntur.lib.ntu.edu.tw/bitstream/246246/172609/1/28.pdf

Petrologic and geochemical constraints on the petrogenesis of Permian Triassic Emeishan flood basalts in southwestern China

http://argonlab.gl.ntu.edu.tw/papers/Lo-Emeishan.pdf

Age of the Emeishan flood magmatism and relations to Permian–Triassic boundary events

http://argonlab.gl.ntu.edu.tw/papers/LeeHY(EPSL)2003.pdf

Miocene Jiali faulting and its implications for Tibetan tectonic evolution

Geochemical and Sr–Nd isotopic characteristics of Cretaceous to Paleocene granitoids and volcanic rocks, SE Tibet: Petrogenesis and tectonic implications

Genyao Wu

Papers

Petrologic and geochemical constraints on the petrogenesis of Permian Triassic Emeishan flood basalts in southwestern China

Age of the Emeishan flood magmatism and relations to Permian–Triassic boundary events

Miocene Jiali faulting and its implications for Tibetan tectonic evolution

Geochemical and Sr–Nd isotopic characteristics of Cretaceous to Paleocene granitoids and volcanic rocks, SE Tibet: Petrogenesis and tectonic implications