Details

Autor(en) / Beteiligte

• Clymans, W.
• Lehtinen, T.
• Gísladóttir, G.
• Lair, G.J.
• Barão, L.
• Ragnarsdóttir, K.V.
• Struyf, E.
• Conley, D.J.

Titel

Si Precipitation During Weathering in Different Icelandic Andosols

Ist Teil von

• Geochemistry of the Earth's Surface (GES) Meeting,2014-08-18 - 2014-08-23, 2014, Vol.10, p.260-265

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2014

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Basaltic weathering from volcanic islands plays a critical role in the climate feedback loop. Geochemical and climate models require information on the rate of secondary mineral formation. We provide direct evidence for precipitation of amorphous Si in organic rich and acidic Histic Andosols compared to preferential allophane formation in organic poor and less acidic Haplic Andosols. Similar results have been obtained from the pioneering work by Opfergelt et al1 using Si isotope composition. Additionally, enhanced allophane precipitation in Haplic Andosols, independent of long-term soil property changes, highlight the potential role of land use and management on secondary mineral formation.