Abstract
Marine accumulations of terrigenous sediment are widely assumed to accurately record climatic- and tectonic-controlled mountain denudation and play an important role in understanding late Cenozoic mountain uplift and global cooling. Underpinning this is the assumption that the majority of sediment eroded from hinterland orogenic belts is transported to and ultimately stored in marine basins with little lag between erosion and deposition. Here we use a detailed and multi-technique sedimentary provenance dataset from the Yellow River to show that substantial amounts of sediment eroded from Northeast Tibet and carried by the river’s upper reach are stored in the Chinese Loess Plateau and the western Mu Us desert. This finding revises our understanding of the origin of the Chinese Loess Plateau and provides a potential solution for mismatches between late Cenozoic terrestrial sedimentation and marine geochemistry records, as well as between global CO2 and erosion records.
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Introduction
The Yellow River (Fig. 1) currently has the world’s highest sediment load1, with an annual sediment discharge of 1,080 × 106 ton per year to the ocean. It is therefore a critical link between eroding uplands and terrigenous sediment records of the marine sedimentary basins used extensively to reconstruct orogenic denudation histories2,3,4. The river’s sediment sources, transport and dispersal patterns, as well as its formation history5,6,7,8, are key for understanding the controversial timing, cause, extent and impact of uplift and denudation of the Northeast (NE) Tibetan Plateau and tectonic–climate linkages3,9,10. However, the origin and drainage history of the river are highly controversial, with estimates of establishment of the current drainage patterns ranging from the Eocene to late Pleistocene6,8,11. Furthermore, the globally important climate and dust archive, the Chinese Loess Plateau loess deposits that lie within the square bend of the Yellow River (Fig. 1), are widely considered to be derived solely from aeolian transport of dust directly from source regions in NE Tibet, western China or northern China and Mongolia12,13,14,15,16,17,18,19,20. The Yellow River is considered to be a net remover of sediment from the Loess Plateau21,22,23. However, a recent study24 suggests that the Yellow River has provided sediment to the Loess Plateau during the last glacial period, casting doubt on the origins of this climate and atmospheric dust archive. Key to unravelling these questions is constraining the river’s past and present sediment sources and dispersal patterns.
Here we constrain these sources and dispersal patterns using the first extensive modern and paleo-river sediment provenance data set based on combined detrital zircon U–Pb dating, heavy mineral and framework petrography. The results show that the Loess Plateau is a major terrestrial sink for Yellow River sediment eroded from the NE Tibetan Plateau.
Results
Modern Yellow River provenance data
Sediment samples from bars in the upper (Fig. 1; samples 1–11; refer to Supplementary Table 1 for sample information) and lower reaches (samples 18–22) of the modern Yellow River show similar provenance signals (zircon U–Pb data (Supplementary Data sets 1, 2 and 3), heavy mineral (Supplementary Table 2) and bulk petrography (Supplementary Table 3)) and are also similar to the modern western Mu Us desert (sample 25) and the Quaternary Chinese Loess Plateau samples (Fig. 2; Supplementary Figs 1, 2 and 3). In contrast, modern bar sediment samples from the Yellow River middle reach (Fig. 1; samples 12–17) show different signals, similar to the Cretaceous sandstones overlying the North China Craton24,25 and similar to the modern sands of the eastern Mu Us desert (samples 26 and 27; Fig. 2; Supplementary Figs 1 and 2). The zircon U–Pb ages of the upper and lower reaches samples, and the western Mu Us desert and the Chinese Loess Plateau samples, show two prominent peaks at ∼450 and ∼250 Myr ago, matching NE Tibetan source rock signatures15,24. In contrast, only one prominent peak at ∼250 Myr ago is expressed in the middle reach, Cretaceous sandstones and the eastern Mu Us desert. In addition, the ages falling between 2,750 and 1,500 Myr ago account for <30% of ages for the upper and lower reaches, the western Mu Us desert and the Chinese Loess Plateau, but comprise >60% of ages from the middle reach, Cretaceous sandstones and eastern Mu Us desert. The heavy mineral assemblages of the upper and lower reaches, western Mu Us desert and Chinese Loess Plateau are dominated by unstable mineral amphibole followed by epidote, while by contrast the middle reach, Cretaceous sandstones and eastern Mu Us desert samples are dominated by stable mineral garnet, with amphibole as the second most abundant mineral type (Fig. 2). In terms of the bulk petrography data, the middle reach has higher quartz content but less lithic fragments than the upper and lower reaches (Fig. 2), indicating higher sediment maturity for the middle reach sediment. This is consistent with their greater garnet content as well as the similarity between heavy mineral and zircon U–Pb signatures of middle reach sediment and the highly weathered Cretaceous sandstones overlying the North China Craton.
Paleo Yellow River provenance data
Comparison of zircon U–Pb data from paleo-river terrace sediment in the upper reach (near site 8: Lanzhou) with the middle reach (near sites 15 and 16) demonstrates that the situation of the upper and the middle reaches having different provenance persists from at least ∼1.7 Myr ago (Fig. 3; Supplementary Fig. 4). The occurrence of ∼3.6 Myr ago terrace conglomerates in Linxia (Jishi conglomerates; yellow pin in Fig. 1) and Lanzhou (Wuquan conglomerates; site 8) that also show similar zircon U–Pb provenance signatures to the current and Pleistocene upper reach provenance signal (Fig. 3; Supplementary Fig. 4) confirm that the current location and pattern of Yellow River upper reach drainage was broadly formed at least by then.
Discussion
To understand the significance of these data, we interpret them in the context of the Yellow River drainage. The Yellow River has traditionally been divided into the upper, the middle and the lower reaches, based on geographical position, elevation and erosional/depositional patterns26,27,28. The upper reach and the middle reach each consist of an erosional section and a depositional section (Supplementary Fig. 5), while the lower reach is characterized by sediment deposition alone26,27,28. The upper reach of the Yellow River is subdivided into an erosional plateau/canyon portion and a depositional alluvial plain portion27,28, separated by the Qingtong Gorge (the yellow hexagon in Fig. 1). Due to the high topographic gradient (Supplementary Fig. 5), the Yellow River flows rapidly and incises in the plateau/canyon portion on the NE Tibetan Plateau, with limited sediment deposition27,28. When the river passes the Qingtong Gorge, leaves the NE Tibetan Platau and enters the Yinchuan-Hetao Graben system, its velocity decreases resulting in deposition and formation of the Yinchuan-Hetao alluvial platform8,27 (Fig. 1; Supplementary Fig. 5). Both Quaternary Chinese Loess Plateau sediment and modern western Mu Us sands show similar provenance signatures to this upper reach sediment (Fig. 2) and are located directly downwind of the Yinchuan-Hetao Graben system under East Asian winter monsoon dust transportation circulation (Fig. 1). Thus, we propose that these extensive river sediment deposits serve as a major source for the western Mu Us desert and the Loess Plateau. By contrast, the middle reach of the Yellow River is dominantly characterized by erosion8,27, as the river enters the Jinshan Canyon (from the upper/middle reach boundary to site 15; Supplementary Fig. 5). A small depositional zone27 occurs at the very end of the middle reach between Xiaolangdi (the yellow star near site 31 in Fig. 1) and Taohuayu (the boundary between the middle and the lower reaches in Fig. 1). The erosional portion of the middle reach has formed deeply incised canyons into Cretaceous sandstone bedrock and underlying North China Craton8,25,29, which, as shown in the provenance data (Fig. 2), is the dominant river sediment source in the middle reach, rather than the overlying loess30. We propose a conceptual model for Yellow River sediment dynamics and Chinese Loess Plateau formation in which both the western Mu Us desert and the Loess Plateau materials are sourced from Yellow River alluvium that is eroded and transported from the NE Tibetan Plateau, deposited in Yinchuan-Hetao alluvial platform, and is then locally redistributed by winter monsoon winds (Fig. 4).
While some past research emphasizes aeolian transport from the Chinese northern deserts in formation of the Chinese Loess Plateau31,32,33,34,35,36, the evidence for this is also compatible with our conceptual model (Figs 1 and 4). Loess grain size has a southward decreasing trend34, which is consistent both with a northern Chinese deserts or Yellow River source for the loess. However, our data show that sands of the western Mu Us are also derived from the Yellow River. Furthermore, recent desert drilling37,38 has demonstrated a late Pleistocene formation age (∼1 Myr ago) for the Tengger and the Badan Jaran desert (Fig. 1). This is significantly younger than the formation age of the Chinese loess and suggests that direct dust transport from these two deserts is only a minor factor in Chinese Loess Plateau formation. In contrast, loess39 immediately south of the Mu Us desert (Jingbian; south of site 26 at the current boundary of the Loess Plateau) has a basal age of 3.5 Myr ago, synchronous with increased sedimentation rate across the central Loess Plateau generally40,41 (Fig. 5) and with the earliest terrace deposits from the river. Furthermore, available satellite imagery42 from a storm event (14–17 April 1998) clearly shows that modern dust storms travelling over the Loess Plateau originate in areas north to northwest of this region, including the Yinchuan-Hetao floodplain. The Yinchuan-Hetao floodplain is, along with the Mu Us, the last major possible sediment source for these storms before they reach the Loess Plateau, providing modern observations consistent with our conceptual model.
The coarse grain size of the Mu Us desert sands makes the possibility of direct aeolian transport from NE Tibetan source regions unlikely, therefore, requiring fluvial transport followed by only more localized aeolian transport. Furthermore, the abrupt shift in provenance away from loess signatures in the middle reach (Fig. 2) occurs precisely when eroding loess on the Loess Plateau would be expected to overwhelm the sediment budget of the river (Figs 1 and 2). We discount dilution as an explanation for this shift in provenance signals (Fig. 2) away from loess in the middle reach as this would require orders of magnitude increases in sediment load to explain the change from the double peak dominance (∼450 and ∼250 Myr ago) in the loess and upper reach zircon U–Pb data, to the ∼250 Myr ago single peak dominance at Baode (sample 12) (Fig. 2; Supplementary Figs 1 and 6). Sediment load only increases ∼24% from the end of the upper reach to Baode21. Thus, we argue that the Loess Plateau and adjacent western Mu Us desert, where provenance signatures match the upper reaches’ and demonstrate a NE Tibet origin24 (Fig. 2), are acting as sinks for NE Tibetan Plateau-derived sediment carried in the upper reach of the Yellow River.
As an approximate check on the feasibility of our model, we calculate the first-order length of time required for Yellow River sediment to fill the Quaternary portion of the approximate volume of the Loess Plateau, using the modern sediment load measured at the Xunhua observation station (∼20 km east of site 6). The amount of time (∼1.65 Myr ago) is of the same order as the basal age of the Quaternary, suggesting Yellow River sediment flux is sufficient to explain the Loess Plateau volume, consistent with our model (Methods). There are considerable uncertainties on this estimate, especially over land use changes and changes in river sediment load through time, as well as possible erosion or deflation on the Loess Plateau. Prior research43 suggests that moderate land use by humans may increase sediment yield by a factor of 2–3. As such, even if we suggest a 2–5 factor decrease in sediment load of the Yellow River when there was no significant human activity, the calculated time required to fill in the Quaternary portion of the Loess Plateau (3.3–8.3 Myr ago) is still on the same order as the bottom age of the Quaternary. However, given these unavoidable uncertainties, we stress that we only use this calculation to determine whether our hypothesis is generally plausible (that is, that the required time is of the order of millions of years rather than 10–100 s of millions of years). Thus, it seems feasible that the large increases in loess sediment accumulation rate and area observed during the Pliocene and Pleistocene40 (Fig. 5d) at least partially result from increased river incision and downstream transport of material from NE Tibet via the Yellow River, rather than due solely to intensified aridity as previously suggested44.
It is interesting to note that the provenance of the lower reach Yellow River is similar to that of the upper reach after the confluence with the Yiluo River (Fig. 1). The provenance shift appears to indicate the effects of the Yiluo River (Fig. 1), which brings in sediment derived from the Qinling Mountains characterized by abundant Phanerozoic zircon U–Pb ages with a double peak45,46,47 at 450 and 250 Myr ago, resulting in a similar signal between the lower and upper reaches, despite different source admixtures (Figs 1 and 4). Again, this provenance shift is consistent with modern observation that the middle reach eroded sediment is deposited between Xiaolangdi and Taohuayu27,28, providing further evidence for terrestrial storage of denudation materials for large rivers. For the modern Yellow River, it is well recorded that only 24% of the sediments flowing past the Sanmen Gorge enter the ocean and the rest are deposited on alluvial plain and the delta regions1,30, consistent with our model.
These findings that the NE Tibet-derived sediments of the upper reach are stored on the Loess Plateau and the western Mu Us desert after 3.6 Myr ago requires a fundamental change in our understanding of the origins of Chinese loess dust and the impact of the Yellow River on the Chinese Loess Plateau. Furthermore, it means that orogenic hinterland erosional signals can be masked in marine sedimentary records by sediment storage in terrestrial basins. If the Tibetan Plateau experienced a phase of northeastward growth and accelerated denudation during the late Pliocene, as suggested by climate and tectonic research11,33,48,49, a significant proportion of the denuded sediment would have been stored on land instead of in the adjacent marine basin. Indeed, this accelerated denudation is reflected in increases in loess sediment accumulation rate observed during the Pliocene and Pleistocene40 (Fig. 5d). Our findings mean that it is unlikely that marine records will properly detect this event. Unfortunately, there are no Plio-Pleistocene provenance data from the Bohai Sea, where the Yellow River drains, to test this and there are a range of possible responses of the marine sediment record to the terrestrial storage demonstrated here. Heavy mineral data from modern Bohai Sea surface sediment50 show that Yellow River marine input is characterized by an assemblage similar to our lower reaches data (for example, dominated by amphibole), consistent with our model. However, there is a clear need for systematic provenance analysis of Plio-Pleistocene Bohai Sea sediment to determine the marine response to NE Tibetan denudation in light of the terrestrial sediment storage that our data demonstrate.
The Yellow River may not be unique in storing most of its upstream-eroded materials on land. Sediment budget research widely demonstrates that although large rivers drain orogenic belts, the majority of the eroded sediments are stored in terrestrial basins and trailing edge margins51,52,53. Instead, small mountain rivers, which are often close to steep active continental margins, play a key role in transporting materials to the ocean52. Thus, our model can help explain the recent evidence for mismatches between the terrestrial sedimentation rate record and the marine Beryllium isotope proxy record of denudation, as well as between late Cenozoic global CO2 and marine sediment volume records3.
The increased NE Tibetan denudation and apparent onset of enhanced Yellow River drainage at ∼3.6 Myr ago are coincident with an increase in C4 plant proportion54, degree of chemical weathering33 and pedogenic magnetic mineral concentration55 (Fig. 5), suggesting that an enhanced monsoon climatic threshold was also reached at the same time. However, our data do not allow us to determine whether this monsoon increase and concurrent increased climate fluctuation amplitude9 or rather tectonic uplift33,48 caused this increased denudation in NE Tibet. While these enhanced summer monsoon conditions could have promoted increased drainage and erosion, coincident with increased loess accumulation rate on land, the relationship between climate change, Tibetan uplift, and denudation has always been difficult to determine56,57,58. Despite this, one potential inference from this result is that the increased NE Tibetan Plateau Pliocene denudation recorded in the loess deposits may be an important driver for Pliocene climate cooling. Increased denudation is known to increase terrestrial chemical weathering and organic carbon burial10,59 and may have also increased the flux of dust to the Pacific ocean, stimulating marine phytoplankton production60,61. All of these factors promote Pliocene atmospheric CO2 drawdown (Fig. 5e) and climatic cooling.
In summary, our research provides the first comprehensive provenance data set demonstrating that the majority of NE Tibet denuded material was deposited on the Loess Plateau and the western Mu Us desert, instead of being effectively delivered to the lower reach and the marine basins since at least the middle Pleistocene. This not only casts new light on the origins of Chinese loess but it undermines the principle of using marine sediment to infer terrestrial denudation and to understand the complex relationship between denudation and climate change. Furthermore, our data suggest that increased NE Tibet denudation recorded in Yellow River-derived sediment on the Loess Plateau is a potentially important driver in Pliocene climate cooling.
Methods
Framework petrography
Samples were collected from active fluvial bars of the Yellow River (Huang He) and some of its major tributaries. They were impregnated with Araldite, cut into standard thin sections, stained with alizarine red to distinguish dolomite and calcite and analysed by counting 400 points under the microscope (Gazzi-Dickinson method62). Sands were classified according to their main components (Q=quartz; F=feldspars; L=lithic fragments), considered only where exceeding 10% QFL and listed in order of abundance (for example, in a litho-feldspatho-quartzose sand Q>F>L>10% QFL). Full quantitative information was collected on coarse-grained rock fragments, and metamorphic types were classified according to protolith composition and metamorphic rank. Very-low- to low-rank metamorphic lithics, for which protoliths can still be inferred, are subdivided into metasedimentary (Lms) and metavolcanic (Lmv) categories. Medium- to high-rank metamorphic lithics are subdivided into felsic (metapelite, metapsammite and metafelsite; Lmf) and mafic (metabasite; Lmb) categories. Median grain size was determined in thin section by ranking and visual comparison with sieved standards.
Heavy minerals
Heavy minerals were separated by centrifuging in sodium polytungstate (density ∼2.90 g cm−3), and recovered by partial freezing with liquid nitrogen. The obtained fraction was weighted and mounted for counting on glass slides with Canada balsam. On grain mounts, between 200 and 250 transparent heavy mineral grains were point-counted at suitable regular spacing under a petrographic microscope to obtain real volume percentages63.
Zircon U–Pb dating
Detrital zircon grains were separated by standard heavy liquid techniques, selected randomly and analysed by laser ablation inductively coupled plasma mass spectrometry in the Department of Geological Sciences at the University of Texas at Austin (seven Lanzhou terrace samples, one Wuquan conglomerate sample and three upper reach modern river samples: 8, 10 and 11), University of Arizona (Linxia gravel sample) and University College London (the rest of the modern Yellow River samples), following the standard procedure of each laboratory16,64,24. We apply a 15–10% discordance filter to the generated data. For ages younger than 1,000 Myr ago, the discordance is defined as (207Pb/235U–206Pb/238U)/ 207Pb/235U*100; for ages older than 1,000 Myr ago, the discordance is defined as (207Pb/206Pb–206Pb/238U)/ 207Pb/206Pb*100. 206Pb/238U ages were adopted for the ages younger than 1,000 Myr ago, while 207Pb/206Pb ages were adopted for the ages older than 1,000 Myr ago, although we slightly shift the cutoff age so as to not break cluster ages for different samples.
Mass balance calculation
We calculate the approximate, first-order amount of time required for Yellow River sediment to fill the Quaternary portion of the Loess Plateau using the modern sediment load data in Xunhua station (∼20 km east of site 6). The approximate timing (1.65 Myr ago) is of the same order as the basal age of the Quaternary, fully consistent with our model. The Loess Plateau area31 (A) is set to 4.4 × 1011 m2. Loess thickness (T) is set to 100 m (ranging from 200 to 0 m from west to east, respectively, during the Quaternary). Dry density65 of loess (D) is set to 1,500 kg m−3. Annual sand transport amount (AA) in the Xunhua station66 (year 1946–1985; before the dam construction) is 4 × 107 ton per year.
Additional information
How to cite this article: Nie, J. et al. Loess Plateau storage of Northeastern Tibetan Plateau-derived Yellow River sediment. Nat. Commun. 6:8511 doi: 10.1038/ncomms9511 (2015).
Change history
18 February 2016
The original version of this Article contained errors in the Supplementary Data files: Zircon U-Pb age results for sample 23 were missing from Supplementary Data 1; while several identification labels relating to Yellow River Lanzhou terraces samples were missing from Supplementary Data 2. Supplementary Data 1 and 2 have now been updated to provide the missing information. Similarly, Zircon U-Pb age results for sample 23 shown in Supplementary Figure 3 are incorrect. A correction has been published and is appended to both the HTML and PDF versions of this paper. This error has not been fixed in the paper.
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Acknowledgements
We are grateful for informal comments by Carmala Garzione. This work is co-supported by the (973) National Basic Research Program of China (Grant Nos 2010CB403301 and 2013CB956400), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB03020400), the National Natural Science Foundation (Grant Nos. 41422204; 41172329; 41021091; 41321061), a UK Natural Environment Research Council (NERC) standard Grant NE/I008837/1, a ‘Fondazione Fratelli Confalonieri’ fellowship and a US National Science Foundation Grant (No. 1348005).
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J.N., T.S., H.L. and B.P. conceived and designed the experiments; M.R., D.S., E.G., M.L., A.B., S.A., H.L., X.H., S.L., A.R., G.V., W.P., A.C. and S.J. performed the experiments; all authors analysed the data; J.S., P.V. and D.B. contributed materials/analysis tools; J.N. and T.S. co-wrote the paper with the help of the co-authors.
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Supplementary information
Supplementary Information
Supplementary Figures 1-6, Supplementary Tables 1-3 and Supplementary References (PDF 29375 kb)
Supplementary Dataset 1
Zircon U-Pb data generated at the University College London (XLS 771 kb)
Supplementary Dataset 2
Zircon U-Pb data generated at the University of Texas in Austin (XLS 358 kb)
Supplementary Dataset 3
Zircon U-Pb ages generated at the University of Arizona (XLS 58 kb)
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Nie, J., Stevens, T., Rittner, M. et al. Loess Plateau storage of Northeastern Tibetan Plateau-derived Yellow River sediment. Nat Commun 6, 8511 (2015). https://doi.org/10.1038/ncomms9511
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DOI: https://doi.org/10.1038/ncomms9511
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