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Unexpected information about Earth's climate history from Yellow River sediment

Date:
October 9, 2015
Source:
Uppsala University
Summary:
By meticulously examining sediments in China's Yellow River, a Swedish-Chinese research group are showing that the history of tectonic and climate evolution on Earth may need to be rewritten.
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This is a side branch of the Yellow River on the north east edge of the Tibetan plateau. Our recent work shows that the Yellow River eroded and incised the uplifting Tibetan plateau and provided the wind-blown dust material that forms the Chinese Loess Plateau, one of the worlds most important past climate archives.
Credit: Thomas Stevens

By meticulously examining sediments in China's Yellow River, a Swedish-Chinese research group are showing that the history of tectonic and climate evolution on Earth may need to be rewritten. Their findings are published today in the highly reputed journal Nature Communications.

To reconstruct how the global climate and topography of the Earth's surface have developed over millions of years, deposits of eroded land sediment transported by rivers to ocean depths are often used. This process is assumed to have been rapid and, by the same token, not to have resulted in any major storages of this sediment as large deposits along the way.

However, knowledge gaps and contradictory data in research to date are impeding an understanding of climate and landscape history. In an attempt to fill the gaps and reconcile the contradictions, the researchers have been investigating present-day and ancient sediment deposits in the world's most sediment-rich river: the Yellow River in China.

The researchers, from Uppsala University (led by Dr. Thomas Stevens) and Lanzhou University (led by Dr. Junsheng Nie), China, analysed Yellow River sediment from source to sink and determined its mineral composition. They also determined the age of mineral grains of zircon, a very hard silicate mineral that is highly resistant to weathering.

Zircon ages serve as a unique fingerprint that yields information about the sources of these sediment residues from mountain chains, according to Thomas Stevens of Uppsala University's Department of Earth Sciences, one of the principal authors of the study.

The Yellow River is believed to gain most of its sediment from wind-blown mineral dust deposits called loess, concentrated on the Chinese Loess Plateau. This plateau is the largest and one of the most important past climate archives on land, and also records past atmospheric dust activity: a major driver of climate change.

The scientists found that the composition of sediment from the Yellow River underwent radical change after passing the Chinese Loess Plateau. Contrary to their expectations, however, the windborne loess was not the main source of the sediment. Instead, they found that the Loess Plateau acts as a sink for Yellow River material eroded from the uplifting Tibetan plateau.

This finding completely changes our understanding of the origin of the Chinese Loess Plateau. It also demonstrates large scale sediment storage on land, which explains the previously contradictory findings in this area.

'Our results suggest that a major change in the monsoon around 3.6 million years ago caused the onset of Yellow River drainage, accelerated erosion of the Tibetan plateau and drove loess deposition,' Thomas Stevens writes.

Weathering of this eroded material also constitutes a further mechanism that may explain the reduced levels of atmospheric carbon dioxide at the beginning of the Ice Age. The researchers' next step will be to compare terrestrial and marine records of erosion to gauge how far sediment storage on land has impacted the marine record.

'Only then will we be able to assess the true rates of erosion and its effect on atmospheric CO2 and thus the climate in geologic time,' says Stevens.


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Materials provided by Uppsala University. Note: Content may be edited for style and length.


Journal Reference:

  1. Junsheng Nie, Thomas Stevens, Martin Rittner, Daniel Stockli, Eduardo Garzanti, Mara Limonta, Anna Bird, Sergio Andò, Pieter Vermeesch, Joel Saylor, Huayu Lu, Daniel Breecker, Xiaofei Hu, Shanpin Liu, Alberto Resentini, Giovanni Vezzoli, Wenbin Peng, Andrew Carter, Shunchuan Ji, Baotian Pan. Loess Plateau storage of Northeastern Tibetan Plateau-derived Yellow River sediment. Nature Communications, 2015; 6: 8511 DOI: 10.1038/NCOMMS9511

Cite This Page:

Uppsala University. "Unexpected information about Earth's climate history from Yellow River sediment." ScienceDaily. ScienceDaily, 9 October 2015. <www.sciencedaily.com/releases/2015/10/151009083037.htm>.
Uppsala University. (2015, October 9). Unexpected information about Earth's climate history from Yellow River sediment. ScienceDaily. Retrieved May 25, 2017 from www.sciencedaily.com/releases/2015/10/151009083037.htm
Uppsala University. "Unexpected information about Earth's climate history from Yellow River sediment." ScienceDaily. www.sciencedaily.com/releases/2015/10/151009083037.htm (accessed May 25, 2017).

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