Ar–Ar muscovite dating as a constraint on sediment provenance and erosion processes in the Red and Yangtze River systems, SE Asia

Hoang, Long Van; Clift, Peter D.; Mark, Darren F.; Zheng, Hongbo; Tân, Mai Thành

doi:10.1016/j.epsl.2010.04.012

Cited by 39 publications

(46 citation statements)

References 39 publications

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“…This result is in agreement with the suggestion by Hoang et al . [], constrained by Ar‐Ar muscovite ages, that the Jinshajiang is not supplying significant sediment.…”

Section: Discussionsupporting

confidence: 86%

Pb isotope compositions of detrital K‐feldspar grains in the upper‐middle Yangtze River system: Implications for sediment provenance and drainage evolution

Zhang

Tyrrell

Chang-an

et al. 2014

Geochem Geophys Geosyst

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The upper-middle Yangtze River drains the Qiangtang Block, the Songpan-Ganzi, the Yangtze Craton, and the Qinling-Dabie orogenic belt. These tectonic units have been shown to have heterogeneous Pb isotopic compositions, which allow this isotope system to be used as a sediment provenance tool. In this study we have employed laser ablation multiple collector inductively coupled plasma mass spectrometry (LA-MC-ICPMS) to measure Pb isotope compositions of sand-sized K-feldspar grains from the upper-middle Yangtze River. Data are presented from four major tributaries: Yalongjiang, Minjiang, Jialingjiang, and Hanjiang, as well as from the main Yangtze River near Yichang. A portion of K-feldspar grains in the Yalongjiang shows an ultraradiogenic character ( 206 Pb/ 204 Pb > 20), which is unique in the upper-middle Yangtze. Moreover, these ultraradiogenic grains were transported as far as Yichang, just downstream from the Three Gorges, suggesting that the Pb-in-K-feldspar method could be applied to the sediments within the Jianghan Basin to date the formation of the Three Gorges. Pb isotopic data from Yichang indicate that erosion in the Longmen Shan and neighboring regions is more important than the Jinshajiang in supplying sediment. The grains in Hanoi Basin have little overlap with the Songpan-Ganzi, but show a good match with the Yangtze Craton in its range of lower 206 Pb/ 204 Pb ratios. These observations support the idea that the ''Middle Yangtze'' used to be a tributary of the paleo-Red River and that there has been no drainage linking the SongpanGanzi and the Red River since the Eocene.

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“…This result is in agreement with the suggestion by Hoang et al . [], constrained by Ar‐Ar muscovite ages, that the Jinshajiang is not supplying significant sediment.…”

Section: Discussionsupporting

confidence: 86%

Pb isotope compositions of detrital K‐feldspar grains in the upper‐middle Yangtze River system: Implications for sediment provenance and drainage evolution

Zhang

Tyrrell

Chang-an

et al. 2014

Geochem Geophys Geosyst

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“…Furthermore, different mineral phases will have different lag times depending on their density, shape and grain size. Radiometric dating of mica by 39 Ar‐ 40 Ar methods and zircons by U‐Pb methods in the Red River has highlighted how different mineral groups may indicate quite different provenances for the same river sediment samples (Hoang et al ., , ). In the Red River example, the discrepancy was explained as reflecting the slower passage of zircon grains through the river compared with the mica or clay fractions.…”

Section: Mineral Transport Timescontrasting

confidence: 47%

Sediment fluxes and buffering in the post‐glacial Indus Basin

Clift

Giosan

2014

Basin Research

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The Indus drainage has experienced major variations in climate since the Last Glacial Maximum (LGM) that have affected the volumes and compositions of the sediment reaching the ocean since that time. We here present a comprehensive first‐order source‐to‐sink budget spanning the time since the LGM. We show that buffering of sediment in the floodplain accounts for ca. 20–25% of the mass flux. Sedimentation rates have varied greatly and must have been on average three times the recent, predamming rates. Much of the sediment was released by incision of fluvial terraces constructed behind landslide dams within the mountains, and especially along the major river valleys. New bedrock erosion is estimated to supply around 45% of the sedimentation. Around 50% of deposited sediment lies under the southern floodplains, with 50% offshore in large shelf clinoforms. Provenance indicators show a change of erosional focus during the Early Holocene, but no change in the Mid–Late Holocene because of further reworking from the floodplains. While suspended loads travel rapidly from source‐to‐sink, zircon grains in the bedload show travel times of 7–14 kyr. The largest lag times are anticipated in the Indus submarine fan where sedimentation lags erosion by at least 10 kyr.

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“…46% of the muscovites to sample (ZL1) because this river now is not a dominant water supplier to the upper Yangtze. However, muscovite 40 Ar/ 39 Ar ages of the modern Yangtze sediment show that the Min River is an important sediment supplier to Yichang and the Yangtze delta due to the high erosion rate in the Min River basin (Hoang et al ., ; Sun et al ., ). The Min River drains the Longmen Shan and Xianshui He Fault areas that have been already tectonically active since the Miocene (Zhang et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Geochronology of detrital muscovite and zircon constrains the sediment provenance changes in the Yangtze River during the late Cenozoic

et al. 2017

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The geometry and evolution of rivers originating from the Tibetan plateau are influenced by topography and climate change during the India‐Asia collision. The Yangtze River is the longest among these rivers and formed due to capturing many rivers on the eastern Tibetan Plateau by the middle Yangtze. The timing of these capture events is still controversial. Here, we use detrital muscovite 40Ar/39Ar and zircon U–Pb ages to constrain the provenance of late Cenozoic sediments in the Jianghan Basin in the middle reaches of the Yangtze River. The combined data suggest that late Pliocene sediments were mainly derived from a local source in the Jianghan Basin including the Dabie Shan. The middle Pleistocene sediments were derived from the Min River west of the Three Gorges. This implies that at least one river, perhaps the palaeo‐Han River, originating from the Dabie Shan region, flowed through the centre of the Jianghan Basin during the late Pliocene. The appearance of sediment from the Min River in the Jianghan Basin somewhere between late Pliocene and middle Pleistocene suggests that the Three Gorges section of the Yangtze River was formed somewhere between late Pliocene and middle Pleistocene (N2– Q2).

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Ar–Ar muscovite dating as a constraint on sediment provenance and erosion processes in the Red and Yangtze River systems, SE Asia

Cited by 39 publications

References 39 publications

Pb isotope compositions of detrital K‐feldspar grains in the upper‐middle Yangtze River system: Implications for sediment provenance and drainage evolution

Pb isotope compositions of detrital K‐feldspar grains in the upper‐middle Yangtze River system: Implications for sediment provenance and drainage evolution

Sediment fluxes and buffering in the post‐glacial Indus Basin

Geochronology of detrital muscovite and zircon constrains the sediment provenance changes in the Yangtze River during the late Cenozoic

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