Introduction and Explanatory Notes

Borch, Christian; Sclater, J.G.; Gartner, Smiljana; Hekinian,; Johnson, Ryan J.; McGowran, D A; Pimm, B; Thompson, Ambler; Veevers, R W; Waterman, Richard W.

doi:10.2973/dsdp.proc.22.101.1974

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…The transparent heavy minerals (see Table 1) were disaggregated and separated from sediments by standard heavy liquid methods, using the 4–2 ϕ (63–250 μm) size fraction (Thompson, 1974; Garzanti et al, 2009). For each sample, 200 points were counted in grain mounts at suitable regular spacing under the petrographic microscope to determine the relative abundance of heavy minerals (Galehouse, 1971; Mange and Maurer, 1992).…”

Section: Methodsmentioning

confidence: 99%

New evidence from heavy minerals and detrital zircons in Quaternary fluvial sediments for the evolution of the upper Yangtze River, South China

et al. 2022

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In the Three Gorges and adjacent areas, there are three planation surfaces and five terraces along the Yangtze River that record the evolution history of the river system. Here, we used diagnostic heavy minerals, U-Pb geochronology, and trace elements of detrital zircons from one planation surface, two terraces, and a modern point bar to reconstruct the evolution history of the upper Yangtze River, specifically the Chuan River in the Sichuan Basin. The sediments in the lowest planation surface had different felsic source rocks derived from east of the Three Gorges, which indicated that before the disintegration of the lowest planation surface (0.75 Ma), there were two paleorivers: the westward-flowing paleo-Chuan River and eastward-flowing paleo-Yangtze River separated by the Huangling Dome. At 0.75–0.73 Ma, the dominant detrital zircons from the Sichuan Basin in the sediments of terrace T5 (the highest terrace) confirmed that the paleo-Yangtze River cut through the Three Gorges and captured the paleo-Chuan River, and the Daliang Mountains became the new drainage divide. Finally, the appearance of materials from the upper Jinsha River in terrace T2 indicated that the paleo-Yangtze River progressively captured the paleo-Jinsha River, and the modern upper Yangtze River formed before 0.05 Ma. These river capture events of the upper Yangtze River confirmed the Quaternary uplift of the SE Tibetan Plateau.

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Section: Methodsmentioning

confidence: 99%