文章名称：Identifying late Neoproterozoic-early Paleozoic sediments in the South Qilian Belt, China: A peri-Gondwana connection in the northern Tibetan Plateau
文章摘要：The provenance and maximum depositional age of Neoproterozoic to early Paleozoic sedimentary rocks from the Balonggonggaer Formation (BF) in the South Qilian belt (northern Tibetan Plateau) is estab- lished using LA-ICP-MS UePb age determinations on detrital zircons taken from fifteen metasedimentary samples. The BF comprises two tectonically juxtaposed metasedimentary sequences that were derived from different source regions. Unit A is characterized by turbiditic facies, thick greywackes, and has zircons ages older than 0.7 Ga and is dominated by 2.2e1.8 Ga and 0.8e0.7 Ga populations that are compatible with a source region within the Quanji massif. Unit A might be deposited after the mid- Neoproterozoic and represent passive margin deposits that developed along the Quanji massif margin during Neoproterozoic continental break-up. Unit B is a highly deformed and metamorphosed sedi- mentary sequence, showing a distinct provenance dominated by age peaks at about 0.56e0.68 Ga, 1.2 e0.9 Ga and 1.60 Ga. These populations bear resemblance to those found in peri-Gondwana terranes. These results favor the placement of Unit B alongside northern peri-Gondwanan terranes. During the early Cambrian, the Qilian-Qaidam basement accreted to the northern margin of Gondwana along the Proto-Tethys. These two distinct sequences of the BF were juxtaposed along the northern margin of Gondwana during the Ordovician to middle Devonian.
引用信息：Li M., Wang C., Li R., Meert J.G., Peng Y., Zhang J., (2019). Identifying late Neoproterozoic-early Paleozoic sediments in the South Qilian Belt, China: A peri-Gondwana connection in the northern Tibetan Plateau. Gondwana Research, 76, 173-184.
