Journal ArticleDOI
Basalt weathering laws and the impact of basalt weathering on the global carbon cycle
TLDR
In this paper, the chemical weathering of basalts and the flux of carbon transferred from the atmosphere to the ocean during this major process at the surface of the Earth were investigated.About:
This article is published in Chemical Geology.The article was published on 2003-12-30. It has received 762 citations till now. The article focuses on the topics: Soil production function & Weathering.read more
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New perspectives on the Li isotopic composition of the upper continental crust and its weathering signature
Lucie Sauzéat,Lucie Sauzéat,Roberta L. Rudnick,Catherine Chauvel,Catherine Chauvel,Marion Garçon,Ming Tang +6 more
TL;DR: In this article, Li isotope compositions and concentrations of periglacial loess samples are controlled by eolian sorting that can be quantified by a binary mixing between a weathered, fine-grained end-member, dominated by phyllosilicates and having low δ7Li, and an unweathered, coarse grained endmember, that is a mixture of quartz and plagioclase having higher δ 7Li.
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Constraining climate sensitivity and continental versus seafloor weathering using an inverse geological carbon cycle model.
TL;DR: A new carbon cycle model is developed that explicitly captures the kinetics of seafloor weathering to investigate carbon fluxes and the evolution of atmospheric CO2 and ocean pH since 100 Myr ago, and finds that 15–31 °C (1σ) surface warming is required to double the continental weathering flux, versus 3–10C in previous work.
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Magnesium retention on the soil exchange complex controlling Mg isotope variations in soils, soil solutions and vegetation in volcanic soils, Iceland
Sophie Opfergelt,Sophie Opfergelt,Kevin W. Burton,R. B. Georg,A.J. West,R. Guicharnaud,Bergur Sigfússon,Christopher Siebert,Sigurdur R. Gislason,Alex N. Halliday +9 more
TL;DR: In this paper, Mg isotope compositions are reported for parent basalt, bulk soils, clay fractions, exchangeable Mg, seasonal soil solutions, and vegetation for five types of volcanic soils in Iceland in order to improve the understanding of sources and processes controlling Mg supply to vegetation and export to the hydrosphere.
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Evolution of trees and mycorrhizal fungi intensifies silicate mineral weathering
Joe Quirk,David J. Beerling,Steve A. Banwart,Gabriella Kakonyi,Maria E. Romero-Gonzalez,Jonathan R. Leake +5 more
TL;DR: Mycorrhiza-driven weathering may have originated hundreds of millions of years earlier than previously recognized and subsequently intensified with the evolution of trees and mycorrhizas to affect the Earth's long-term CO2 and climate history.
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Linking nm-scale measurements of the anisotropy of silicate surface reactivity to macroscopic dissolution rate laws: New insights based on diopside
TL;DR: In this article, the authors link nm-scale measurements of the anisotropy of silicate surface reactivity to macroscopic dissolution rate laws, and propose a method based on diopside measurements.
References
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Global silicate weathering and CO2 consumption rates deduced from the chemistry of large rivers
TL;DR: In this article, newly compiled data on the 60 largest rivers of the world are used to calculate the contribution of main lithologies, rain and atmosphere to river dissolved loads, and the relationship between the chemical weathering rates of silicates and the possible controlling parameters are explored.
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The carbonate-silicate geochemical cycle and its effect on atmospheric carbon dioxide over the past 100 million years
TL;DR: In this article, a computer model has been constructed that considers the effects on the CO/sub 2/ level of the atmosphere, and the Ca, Mg, and HCO/sub 3/ levels of the ocean, of the following processes: weathering on the continents of calcite, dolomite, and calcium-and-magnesium-containing silicates; biogenic precipitation and removal of CaCO 3/from the ocean; removal of Mg from the ocean via volcanic-seawater reaction; and the metamorphic-magmatic decarbon
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Tectonic forcing of late Cenozoic climate
TL;DR: In particular, tectonically driven increases in chemical weathering may have resulted in a decrease of atmospheric C02 concentration over the past 40 Myr as discussed by the authors. But this was not shown to be the case for the uplift of the Tibetan plateau and positive feedbacks initiated by this event.
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Geocarb III: A Revised Model of Atmospheric CO2 over Phanerozoic Time
TL;DR: In this article, the GEOCARB model has been updated with an emphasis on factors affecting CO2 uptake by continental weathering, including the role of plants in chemical weathering and the application of GCMs to study the long-term carbon cycle.
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A negative feedback mechanism for the long‐term stabilization of Earth's surface temperature
TL;DR: In this article, it is suggested that the partial pressure of carbon dioxide in the atmosphere is buffered, over geological time scales, by a negative feedback mechanism, in which the rate of weathering of silicate minerals (followed by deposition of carbonate minerals) depends on surface temperature, which in turn depends on the carbon dioxide partial pressure through the greenhouse effect.