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Seismically enhanced solute fluxes in the Yangtze River headwaters following the A.D. 2008 Wenchuan earthquake

Jin, Z.; West, A.J.; Zhang, F.; An, Z.; Hilton, R.G.; Yu, J.; Wang, J.; Li, G.; Deng, L.; Wang, X.

Seismically enhanced solute fluxes in the Yangtze River headwaters following the A.D. 2008 Wenchuan earthquake Thumbnail


Authors

Z. Jin

A.J. West

F. Zhang

Z. An

R.G. Hilton

J. Yu

J. Wang

G. Li

L. Deng

X. Wang



Abstract

Large earthquakes alter physical and chemical processes at Earth’s surface, triggering landslides, fracturing rock, changing large-scale permeability, and influencing hydrologic pathways. The resulting effects on global chemical cycles are not fully known. Here we show changes in the dissolved chemistry of the Min Jiang, a river in the Yangtze River (China) headwaters, following the A.D. 2008 Mw 7.9 Wenchuan earthquake. Total solute fluxes transported by the Min Jiang increased after the earthquake, accompanied by an ∼4× increase in Na*/Ca ratios (where Na* is Na+ corrected for atmospheric and evaporite contributions) and a 0.000644 ± 0.000146 increase in 87Sr/86Sr isotopic ratios. These changes are consistent with enhanced contribution from silicate sources. We infer that the CO2 consumption rate via silicate-derived alkalinity increased 4.3 ± 0.4 times. If similar changes are associated with other large earthquakes, enhanced solute export could directly link tectonic activity with weathering and alkalinity fluxes that supply nutrients to ecosystems, influence seawater chemistry evolution, and steer Earth’s long-term carbon cycle and climate.

Citation

Jin, Z., West, A., Zhang, F., An, Z., Hilton, R., Yu, J., …Wang, X. (2016). Seismically enhanced solute fluxes in the Yangtze River headwaters following the A.D. 2008 Wenchuan earthquake. Geology, 44(1), 47-50. https://doi.org/10.1130/g37246.1

Journal Article Type Article
Acceptance Date Nov 5, 2015
Online Publication Date Nov 20, 2015
Publication Date Jan 1, 2016
Deposit Date Nov 23, 2015
Publicly Available Date Nov 20, 2016
Journal Geology
Print ISSN 0091-7613
Electronic ISSN 1943-2682
Publisher Geological Society of America
Peer Reviewed Peer Reviewed
Volume 44
Issue 1
Pages 47-50
DOI https://doi.org/10.1130/g37246.1

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